Cylindrical platform test method, device, equipment and medium

Abstract

The invention relates to the field of marine oil and gas engineering, and discloses a cylindrical platform test method, device and equipment and a medium. Vortex-induced motion simulation can be carried out on the constructed cylindrical platform model, the vortex-induced load borne by the cylindrical platform is determined, and when a wave current working condition test is carried out on the cylindrical platform for test, the reduced vortex-induced load is directly applied to the cylindrical platform for test through the vortex-induced load applying equipment, so that the test efficiency is improved. The action of ocean current received by the cylindrical platform for the test is simulated without simulating the ocean current in a wave current working condition test pool, so that the accuracy of the vortex-induced load applied to the cylindrical platform for the test is improved, equivalent simulation is effectively realized, the accuracy of test data can be enhanced, and the test efficiency is improved. And the safety is enhanced for improving the cylindrical platform according to test data.

Description

Technical Field

[0001] The invention relates to the field of marine oil and gas engineering, and in particular to a cylindrical platform test method, device, equipment and medium. Background Art

[0002] As the development of marine oil and gas resources shifts from shallow waters to deep seas, cylindrical platforms have developed rapidly. Compared with ship-type platforms, the overall performance of cylindrical platforms is better.

[0003] When a cylindrical platform is working in the ocean, it will be affected by waves and currents. Among them, the ocean currents will cause vortex-induced motion of the cylindrical platform, which will then impose vortex-induced loads on the cylindrical platform, threatening the structural safety.

[0004] The relevant technology can place the test cylindrical platform corresponding to the cylindrical platform into a test water tank, use the water in the test water tank to simulate the waves and currents in the ocean and act on the test cylindrical platform, so as to carry out wave and current condition tests on the test cylindrical platform. After that, the structure of the cylindrical platform can be improved according to the test data to enhance the structural safety of the cylindrical platform.

[0005] However, the Reynolds number of the test cylindrical platform is generally two orders of magnitude smaller than that of the cylindrical platform, resulting in the vortex-induced load imposed on the test cylindrical platform by the ocean flow simulated in the test water tank being smaller than the vortex-induced load that should be imposed. Equivalent simulation cannot be achieved, resulting in inaccurate test data and posing safety risks to the cylindrical platform. Summary of the invention

[0006] The present invention provides a cylindrical platform test method, device, equipment and medium to solve the problem in the related art that the Reynolds number of the cylindrical platform used for the test is generally two orders of magnitude smaller than the Reynolds number of the cylindrical platform, resulting in the vortex-induced load applied to the cylindrical platform used for the test by the ocean flow simulated by the test water tank being smaller than the vortex-induced load that should be applied, and failing to achieve equivalent simulation, resulting in inaccurate test data and bringing safety risks to the cylindrical platform, thereby enhancing the safety of the cylindrical platform.

[0007] In a first aspect, the present invention provides a cylindrical platform test method, comprising: According to the size of the cylindrical platform, a cylindrical platform model and a three-dimensional numerical water pool are constructed; Setting the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; The cylindrical platform model is fixed to the target numerical water pool, and an ocean current with a preset flow rate is simulated in the target numerical water pool to simulate vortex-induced motion of the fixed cylindrical platform model; Determining the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation; Based on the vortex-induced load, a wave-current working condition test is performed on the test cylindrical platform corresponding to the cylindrical platform model, and motion response data of the test cylindrical platform during the wave-current working condition test is recorded.

[0008] Optionally, constructing a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform includes: According to the size of the cylindrical platform, construct a cylindrical platform model with the same model size as the size of the cylindrical platform; Determine the diameter of the circular surface of the cylindrical platform model, determine the setting conditions that the target fixed position of the cylindrical platform model must meet, and determine the height condition of the three-dimensional numerical water pool to be constructed; wherein the target fixed position is the fixed position of the cylindrical platform model in the three-dimensional numerical water pool to be constructed, and the height condition is that the height of the three-dimensional numerical water pool to be constructed is higher than the design water level of the cylindrical platform model; The length, width and height of the three-dimensional numerical water pool to be constructed are determined according to the circular surface diameter of the cylindrical platform model, the set conditions and the height conditions, and the three-dimensional numerical water pool is constructed according to the determined length, width and height.

[0009] Optionally, the set conditions include a first condition, a second condition and a third condition; wherein: The first condition includes: the target fixed position is located on the lower inner wall surface of the three-dimensional numerical water pool to be constructed, and the distance between the target fixed position and the left inner wall surface of the three-dimensional numerical water pool to be constructed is greater than 0 and not greater than a first distance, which is used to ensure that the cylindrical platform model successfully withstands the vortex-induced load in the vortex-induced motion simulation to be performed; wherein the first distance is the product of the diameter of the circular surface and a preset first positive integer; The second condition is that the distance between the target fixed position and the right inner wall of the three-dimensional numerical water pool to be constructed is not less than a second distance, which is used to ensure that the tail vortex of the cylindrical platform model in the vortex-induced motion simulation to be performed can be fully developed; the second distance is the product of the diameter of the circular surface and a preset second positive integer; The third condition is that the distance between the target fixed position and the front inner wall and the rear inner wall of the three-dimensional numerical water pool to be constructed is not less than a third distance, which is used to prevent the cylindrical platform model from being affected by the reflected waves of the front inner wall and the rear inner wall in the vortex-induced motion simulation to be performed; the third distance is the product of the diameter of the circular surface and a preset third positive integer.

[0010] Optionally, the setting of the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions includes: The left wall and the right wall of the three-dimensional numerical water pool are defined as the inflow inlet and the pressure outlet respectively, the lower inner wall of the three-dimensional numerical water pool is set as the free slip wall, and the front wall and the rear wall of the three-dimensional numerical water pool are set as symmetric boundaries to obtain the target numerical water pool.

[0011] The step of fixing the cylindrical platform model into the target numerical water pool comprises: The cylindrical platform model is placed and fixed at a position in the target value pool corresponding to the target fixed position.

[0012] Optionally, simulating an ocean current of a preset flow rate in the target value water pool to perform vortex-induced motion simulation on the fixed cylindrical platform model includes: Determining the design water level of the fixed cylindrical platform; A virtual water flow with a preset flow rate and a water level reaching the set water level is continuously delivered to the inflow inlet in the target numerical water pool, and turbulent motion simulation is performed on the virtual water flow to simulate an ocean current with a preset flow rate in the target numerical water pool, form a corresponding flow field space, and perform vortex-induced motion simulation on the fixed cylindrical platform model.

[0013] Optionally, the determining of the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation includes: Meshing the flow field space in the target numerical water pool, and encrypting the mesh of the cylindrical platform model and the corresponding wake area fixed in the flow field space to obtain a meshing result; Based on the meshing results and the numerical simulation algorithm, the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation is determined.

[0014] Optionally, based on the vortex-induced load, the wave and flow condition test is performed on the test cylindrical platform corresponding to the cylindrical platform model, including: Based on a preset scale reduction ratio, constructing a test cylindrical platform corresponding to the cylindrical platform model; wherein the scale ratio between the test cylindrical platform and the cylindrical platform model is the scale reduction ratio; Based on the scale reduction ratio, the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation is reduced to obtain the reduced vortex-induced load; In a wave and current condition test pool, inertial force is applied to the test cylindrical platform based on the pool wave generation method, and the reduced vortex-induced load is applied to the test cylindrical platform through the vortex-induced load application equipment arranged on the test cylindrical platform, so as to carry out a wave and current condition test on the test cylindrical platform.

[0015] In a second aspect, the present invention provides a cylindrical platform test device, comprising: A construction unit, used for constructing a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform; A setting unit, used for setting the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; A fixing unit, used for fixing the cylindrical platform model to the target value water pool; A simulation unit, used for simulating an ocean current of a preset flow rate in the target value water pool, so as to simulate vortex-induced motion of the fixed cylindrical platform model; A determination unit, used for determining the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation; A test unit, used for performing a wave and flow condition test on the test cylindrical platform corresponding to the cylindrical platform model based on the vortex-induced load; The recording unit is used to record the motion response data of the test cylindrical platform during the wave and current condition test.

[0016] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the cylindrical platform test method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0017] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the cylindrical platform test method of the first aspect or any corresponding embodiment thereof.

[0018] The cylindrical platform test method, device, equipment and medium provided by the present invention can construct a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform; set the properties of each wall in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; fix the cylindrical platform model to the target numerical water pool, and simulate the ocean current with a preset flow rate in the target numerical water pool to simulate the vortex-induced motion of the fixed cylindrical platform model; determine the vortex-induced load that the fixed cylindrical platform model is borne in the vortex-induced motion simulation; based on the vortex-induced load, perform a wave-current working condition test on the test cylindrical platform corresponding to the cylindrical platform model, and record the motion response data of the test cylindrical platform during the wave-current working condition test. The present invention can simulate the vortex-induced motion of the constructed cylindrical platform model, determine the vortex-induced load borne by the cylindrical platform, and when the test cylindrical platform is subjected to a wave and current condition test, directly apply the reduced vortex-induced load to the test cylindrical platform through the vortex-induced load applying device to simulate the ocean current effect received by the test cylindrical platform, without simulating the ocean current in the wave and current condition test pool, thereby improving the accuracy of the vortex-induced load applied to the test cylindrical platform and effectively realizing equivalent simulation, thereby enhancing the accuracy of the test data and improving the safety of the cylindrical platform according to the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A flow chart of a cylindrical platform test method provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a cylindrical platform model provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a three-dimensional numerical water pool provided by an embodiment of the present invention; Figure 4 A flow chart of another cylindrical platform test method provided by an embodiment of the present invention; Figure 5 A schematic structural diagram of a cylindrical platform test device provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of a computer device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] To solve the problem that the Reynolds number of the test cylindrical platform in the related technology is generally two orders of magnitude smaller than the Reynolds number of the cylindrical platform, the vortex-induced load applied to the test cylindrical platform by the ocean flow simulated in the test water tank is smaller than the vortex-induced load that should be applied, and equivalent simulation cannot be achieved, resulting in inaccurate test data and posing safety risks to the cylindrical platform. The cylindrical platform test method, device, equipment and medium proposed in this embodiment can construct a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform; set the properties of each wall in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; fix the cylindrical platform model to the target numerical water pool, and simulate the ocean current with a preset flow rate in the target numerical water pool to simulate the vortex-induced motion of the fixed cylindrical platform model; determine the vortex-induced load that the fixed cylindrical platform model is borne in the vortex-induced motion simulation; based on the vortex-induced load, perform a wave and current condition test on the experimental cylindrical platform corresponding to the cylindrical platform model, and record the motion response data of the experimental cylindrical platform during the wave and current condition test. This embodiment can simulate the vortex-induced motion of the constructed cylindrical platform model, determine the vortex-induced load borne by the cylindrical platform, and when conducting a wave and current condition test on the experimental cylindrical platform, directly apply the reduced vortex-induced load to the experimental cylindrical platform through the vortex-induced load application equipment to simulate the ocean current effect received by the experimental cylindrical platform, without the need to simulate the ocean current in the wave and current condition test pool, thereby improving the accuracy of the vortex-induced load applied to the experimental cylindrical platform and effectively realizing equivalent simulation, thereby enhancing the accuracy of the test data and improving the safety of the cylindrical platform according to the test data.

[0023] Combine the following Figure 1-Figure 4 The cylindrical platform test method according to the embodiment of the present invention is described.

[0024] like Figure 1 As shown, this embodiment proposes a first cylindrical platform test method, which may include the following steps: S101. Construct a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform.

[0025] The cylindrical platform may be a physical cylindrical platform actually used for oil and gas exploration and production related activities in the ocean, and the cylindrical platform model may be a virtual cylindrical platform constructed in numerical simulation.

[0026] Specifically, this embodiment can obtain the size of the cylindrical platform, and construct a corresponding cylindrical platform model in the numerical simulation algorithm according to the cylindrical platform. It should be noted that the size of the cylindrical platform model may correspond to the size of the cylindrical platform.

[0027] The size of the cylindrical platform model can be obtained by reducing or enlarging the size of the cylindrical platform. Of course, the size of the cylindrical platform model and the size of the cylindrical platform can be exactly the same. Specifically, the appearance diagram of the cylindrical platform model and the cylindrical platform can be as follows: Figure 2 shown.

[0028] Specifically, this embodiment can construct a three-dimensional numerical water pool to be used for the cylindrical platform model according to the needs of the cylindrical platform model and vortex-induced motion simulation.

[0029] Optionally, step S101 may include: According to the size of the cylindrical platform, a cylindrical platform model with the same model size as the cylindrical platform is constructed; Determine the circular diameter of the cylindrical platform model, determine the setting conditions that the target fixed position of the cylindrical platform model must meet, and determine the height condition of the three-dimensional numerical water pool to be constructed; wherein the target fixed position is the fixed position of the cylindrical platform model in the three-dimensional numerical water pool to be constructed, and the height condition is that the height of the three-dimensional numerical water pool to be constructed is higher than the design water level of the cylindrical platform model; According to the circular diameter of the cylindrical platform model, the setting conditions and the height conditions, the length, width and height of the three-dimensional numerical water pool to be constructed are determined, and the three-dimensional numerical water pool is constructed according to the determined length, width and height.

[0030] Optionally, the setting conditions include a first condition, a second condition and a third condition; wherein: The first condition includes: the target fixed position is located on the lower inner wall surface of the three-dimensional numerical water pool to be constructed, and the distance between the target fixed position and the left inner wall surface of the three-dimensional numerical water pool to be constructed is greater than 0 and not greater than a first distance, which is used to ensure that the cylindrical platform model successfully withstands the vortex-induced load in the vortex-induced motion simulation to be performed; wherein the first distance is the product of the circular surface diameter and a preset first positive integer; The second condition is that the distance between the target fixed position and the right inner wall of the three-dimensional numerical water pool to be constructed is not less than a second distance, which is used to ensure that the tail vortex of the cylindrical platform model in the vortex-induced motion simulation to be performed can be fully developed; the second distance is the product of the diameter of the circular surface and a preset second positive integer; The third condition is that the distance between the target fixed position and the front inner wall and the rear inner wall of the three-dimensional numerical water pool to be constructed is not less than the third distance, which is used to prevent the cylindrical platform model from being affected by the reflected waves of the front inner wall and the rear inner wall in the vortex-induced motion simulation to be carried out; the third distance is the product of the circular surface diameter and a preset third positive integer.

[0031] The first positive integer, the second positive integer and the third positive integer can be set by technicians according to actual conditions, and are not limited in this embodiment. For example, the first positive integer and the second positive integer can be 5, and the third positive integer can be 15. In this case, the length, width and height of the three-dimensional numerical pool can be 25D, 10D and 3D respectively, and D is the diameter of the circular surface of the cylindrical platform model.

[0032] like Figure 3 In the three-dimensional numerical water pool shown, the left wall is defined as the flow inlet, the right wall is defined as the pressure outlet, the front and rear walls are symmetric boundaries, and the upper and lower walls are free slip walls.

[0033] S102, setting the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions.

[0034] Optionally, step S102 may include: The left wall and the right wall of the three-dimensional numerical water pool are defined as the inflow inlet and the pressure outlet respectively, the lower inner wall of the three-dimensional numerical water pool is set as the free slip wall, and the front wall and the rear wall of the three-dimensional numerical water pool are set as symmetry boundaries to obtain the target numerical water pool.

[0035] It should be noted that, in this embodiment, the lower inner wall of the three-dimensional numerical water pool is set as a free sliding wall, so that the simulated ocean current is not restricted by the wall when moving. The front wall and the rear wall of the three-dimensional numerical water pool are set as symmetrical boundaries, which can effectively reduce the amount of calculation in the subsequent solution of the vortex-induced load of the vortex-induced motion simulation in the target numerical water pool.

[0036] S103, fixing the cylindrical platform model into the target value pool.

[0037] Optionally, step S103 may include: Place and fix the cylindrical platform model to a position in the target numerical pool corresponding to the target fixed position.

[0038] S104, simulating an ocean current with a preset flow rate in a target numerical water pool to simulate vortex-induced motion of the fixed cylindrical platform model.

[0039] Among them, the preset flow rate can be set by technical personnel according to actual conditions, and this embodiment does not limit it.

[0040] Optionally, step S104 may include: Determine the design water level of the fixed cylindrical platform; A virtual water flow with a preset flow rate and a water level reaching the set water level is continuously delivered to the inflow inlet in the target numerical water pool, and the turbulent motion of the virtual water flow is simulated to simulate the ocean current with a preset flow rate in the target numerical water pool, thereby forming a corresponding flow field space and vortex-induced motion simulation of the fixed cylindrical platform model.

[0041] Specifically, the present embodiment can use the Reynolds average method to simulate turbulent motion, so that the virtual water flow has viscous force, and effectively realizes a realistic simulation of the marine environment.

[0042] S105. Determine the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation.

[0043] Optionally, step S105 may include: The flow field space in the target numerical water pool is meshed, and the meshes of the fixed cylindrical platform model and the corresponding wake area in the flow field space are encrypted to obtain the meshing result; Based on the meshing results and numerical simulation algorithm, the vortex-induced loads borne by the fixed cylindrical platform model in the vortex-induced motion simulation are determined.

[0044] Specifically, this embodiment takes into account the computational efficiency and accuracy, and when meshing the flow field space, the lateral meshes of the cylindrical platform model and the meshes in the wake region are encrypted, while other regions with relatively uniform flows are meshed with relatively sparse meshes.

[0045] Specifically, this embodiment can determine the vortex-induced load borne by the cylindrical platform model in the vortex-induced motion simulation based on fluid mechanics and numerical calculation.

[0046] Optionally, this embodiment can construct corresponding flow field equations such as partial differential equations according to the flow field characteristics, use the finite volume method to discretize the partial differential equations, use the second-order upwind discretization format for spatial discretization, use the implicit non-steady-state second-order time format for time discretization, and use the SIMPLE algorithm for velocity-pressure to solve the vortex-induced loads borne by the cylindrical platform model in the vortex-induced motion simulation.

[0047] S106. Based on the vortex-induced load, a wave-current condition test is performed on the test cylindrical platform corresponding to the cylindrical platform model.

[0048] The size of the test cylindrical platform may correspond to the size of the cylindrical platform model. For example, the size of the test cylindrical platform may be obtained by scaling down or enlarging the size of the cylindrical platform model. For another example, the size of the test cylindrical platform may be the same as the size of the cylindrical platform model.

[0049] Optionally, step S106 may include: Based on a preset scale reduction ratio, a test cylindrical platform corresponding to the cylindrical platform model is constructed; wherein the scale ratio between the test cylindrical platform and the cylindrical platform model is the scale reduction ratio; Based on the scale reduction ratio, the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation is reduced to obtain the reduced vortex-induced load; In the wave and current condition test pool, inertial force is applied to the test cylindrical platform based on the wave generation method of the pool, and the reduced vortex-induced load is applied to the test cylindrical platform through the vortex-induced load application equipment arranged on the test cylindrical platform, so as to carry out wave and current condition test on the test cylindrical platform.

[0050] Specifically, when the scales of the cylindrical platform and the cylindrical platform model are the same, this embodiment can determine the density ratio of the test cylindrical platform and the cylindrical platform, and reduce the vortex-induced load based on the scale reduction ratio and the density ratio to obtain the reduced vortex-induced load.

[0051] It should be noted that according to Newton's second law, F=ma, where F represents force, m represents mass, and a represents acceleration. In this embodiment, it is hoped that the effect of the vortex-induced force on the cylindrical platform is the same as the effect of the vortex-induced force obtained by the same model on the size of the test cylindrical platform, that is, a real = a model, and F real / m real = F model / m model is required at this time, and F real / m real = F model / m model can be transformed into F real / F model = m real / m model, then m real / m model = V real ρ real / V model ρ model, and the volume ratio can be regarded as three times the scale ratio multiplied by the density ratio, that is, V real / V model = L real ^3 / L model ^3 = α ^3 × ρ real / ρ model; and according to the moment calculation formula M = FL, M and L are the moment and the lever arm respectively, and L will also be reduced according to the scale ratio due to the change from the actual platform to the test platform. In summary, M real / M model = L real F real / L model F model = α ^4 times ρ real / ρ model, that is, it is reduced according to four times the scale ratio and the density ratio.

[0052] Specifically, in this embodiment, a model mooring system equivalent to the actual mooring system, a vortex-induced load application device, and a non-contact optical motion measurement system can be installed on the test cylindrical platform.

[0053] It can be understood that, in this embodiment, when the wave and current condition test is carried out on the test cylindrical platform, the reduced vortex-induced load can be directly applied to the test cylindrical platform through the vortex-induced load application equipment to simulate the ocean current effect received by the test cylindrical platform, without simulating the ocean current in the wave and current condition test pool.

[0054] Optionally, the reduced vortex-induced load includes the vortex-induced lift torque and vortex-induced drag torque that vary with time. It is understandable that, in the process of vortex-induced motion simulation of the cylindrical platform, the present embodiment can save the vortex-induced lift torque and vortex-induced drag torque that vary with time to the database. At this time, in the wave and flow condition test of the test cylindrical platform, the present embodiment can extract the vortex-induced lift torque and vortex-induced drag torque that vary with time from the database, and apply the vortex-induced lift torque and vortex-induced drag torque that vary with time to the test cylindrical platform.

[0055] Optionally, when the wave and current working condition test is performed on the test cylindrical platform in this embodiment, the test duration may be a preset duration threshold, such as 23.5 minutes, which is equivalent to the movement duration of the cylindrical platform in the ocean being no less than 3 hours. In this embodiment, the test may be stopped when the test duration of the test cylindrical platform reaches the preset duration threshold.

[0056] S107. Record the motion response data of the test cylindrical platform during the wave and current condition test.

[0057] Specifically, this embodiment can record the motion response data of the test cylindrical platform during the wave and current condition test of the test cylindrical platform.

[0058] In practical applications, this embodiment can simulate ocean currents of different velocities in a target numerical water pool, perform multiple vortex-induced motion simulations on the cylindrical platform model, and obtain the vortex-induced load of the cylindrical platform model under ocean currents of different velocities, thereby obtaining the motion response data of the experimental cylindrical platform under different ocean current velocities, providing considerations for the construction of the cylindrical platform.

[0059] It should be noted that in the hydrodynamic test of the test platform in the relevant technology, the test platform is simultaneously affected by waves and currents, that is, by inertial force and viscous force. Froude similarity ensures the correct relationship between gravity and inertial force between the model and the cylindrical platform, and also correctly simulates the similarity of viscous force. For example, the viscous roll damping moment and low-frequency slow drift damping force of the ship, the viscous force suffered by the riser and mooring cable, etc. The Reynolds similarity criterion can ensure the correct relationship between the viscous force and inertial force between the model and the real object, which requires that the Reynolds number of the test platform and the cylindrical platform be equal. However, in the hydrodynamic test of the ship and marine engineering field, it is impossible to make the Reynolds number of the test platform and the cylindrical platform equal. Generally speaking, the Reynolds number of the test platform is two orders of magnitude smaller than that of the cylindrical platform. Therefore, the viscous force coefficient generated in the test platform, the viscous roll damping and low-frequency slow drift damping of the floating body, and the viscous damping of the mooring cable are all greater than the corresponding values ​​of the entity. In other words, the extreme motion and force experienced by the test platform will be proportionally smaller than those of the cylindrical platform. Directly predicting the situation of the cylindrical platform using the test platform test results will be too small, which brings certain risks to practical applications.

[0060] It should be noted that this embodiment uses numerical simulation to solve the vortex-induced loads borne by the cylindrical platform model, avoiding the viscous force error caused by different Reynolds numbers, and at the same time coupling with the motion of the experimental cylindrical platform in the wave to more accurately obtain the time domain motion response of the platform.

[0061] It should also be noted that, in the related technology, when conducting platform wave resistance tests, when conducting wave and current condition tests, since the simulated water pool cannot meet the Reynolds number similarity, the viscous force cannot meet the equivalence, resulting in the obtained platform motion response being inaccurate. In this embodiment, since the water pool test can meet the Froude number similarity but cannot meet the Reynolds number similarity, when conducting the water pool test, the water pool wave generation can continue to be used to complete the simulation of the inertial force, and the viscous force is solved by numerical calculation of the vortex-induced load on the cylindrical platform model and then scaled down in proportion, and the scaled-down vortex-induced load is applied to the test cylindrical platform, avoiding the viscous force error caused by the dissimilarity of the Reynolds number, making the test data more accurate.

[0062] In the theoretical derivation of related technologies, the calculation is performed by the same Reynolds number (i.e., the viscous force is similar), and it is believed that the force obtained through the test can be equivalent to the force of the actual platform. However, in fact, the Reynolds number similarity cannot be satisfied in the water pool, so this equivalent force is always biased. This process can be avoided by directly calculating the vortex force of the actual platform and reducing it according to the scale ratio. It is believed that the viscous force is similar, and the Froude number similarity can be achieved in the experimental water pool (i.e., the inertial force is considered to be similar). Then, in the water pool test, the calculated force is added to the test platform, that is, the viscous force and the inertial force are similar, that is, the full similarity is achieved, so that the test data can accurately reflect the movement of the actual platform.

[0063] This embodiment can couple the vortex-induced load with the actual waves through numerical simulation to avoid the error caused by the dissimilarity of viscous forces, and can effectively correct the vortex-induced motion error of the floating body in motion, making the test more accurate.

[0064] The cylindrical platform test method proposed in this embodiment can construct a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform; set the properties of each wall in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; fix the cylindrical platform model to the target numerical water pool, and simulate the ocean current with a preset flow rate in the target numerical water pool to simulate the vortex-induced motion of the fixed cylindrical platform model; determine the vortex-induced load that the fixed cylindrical platform model is borne in the vortex-induced motion simulation; based on the vortex-induced load, perform a wave and current condition test on the experimental cylindrical platform corresponding to the cylindrical platform model, and record the motion response data of the experimental cylindrical platform during the wave and current condition test. This embodiment can simulate the vortex-induced motion of the constructed cylindrical platform model, determine the vortex-induced load borne by the cylindrical platform, and when conducting a wave and current condition test on the experimental cylindrical platform, directly apply the reduced vortex-induced load to the experimental cylindrical platform through the vortex-induced load application equipment to simulate the ocean current effect received by the experimental cylindrical platform, without the need to simulate the ocean current in the wave and current condition test pool, thereby improving the accuracy of the vortex-induced load applied to the experimental cylindrical platform and effectively realizing equivalent simulation, thereby enhancing the accuracy of the test data and improving the safety of the cylindrical platform according to the test data.

[0065] like Figure 4 As shown, this embodiment proposes another cylindrical platform test method, which can include vortex-induced motion simulation and wave simulation.

[0066] Among them, the vortex-induced motion simulation can specifically include constructing a viscous three-dimensional numerical water pool, setting the flow field size, boundary conditions and flow velocity. Construct a rigid body model of the facility platform, i.e. a cylindrical platform model, set the platform parameters, and place it in the numerical water pool. Divide the flow field grid, and encrypt the lateral grid and wake area of ​​the platform, i.e. the cylindrical platform model. Define the finite volume method spatial format, time scale and velocity-pressure coupling algorithm. Solve the vortex-induced motion of the platform at a certain flow velocity, obtain the vortex-induced load time history curve, and reduce it according to the scale ratio.

[0067] The wave simulation may specifically include simulating waves with a model test, installing an equivalent mooring system, a vortex-induced load driving device, and a six-degree-of-freedom sensor on the model, i.e., the test cylindrical platform. Conducting a wave resistance test on the test cylindrical platform. Inputting the obtained vortex-induced load into the device. The device drives the platform to generate motion. After the test is completed, the motion response of the platform is output.

[0068] It can be understood that the specific execution process of vortex-induced motion simulation and wave simulation can refer to the embodiment of the present invention. Figure 1 The description of each step will not be repeated here.

[0069] like Figure 5 As shown, this embodiment provides a wave and flow condition test device for a cylindrical platform, which may include: A construction unit 501 is used to construct a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform; A setting unit 502 is used to set the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; A fixing unit 503 is used to fix the cylindrical platform model to the target value pool; The simulation unit 504 is used to simulate an ocean current with a preset flow rate in a target numerical water pool to simulate vortex-induced motion of the fixed cylindrical platform model; A determination unit 505 is used to determine the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation; The test unit 506 is used to perform a wave and flow condition test on the test cylindrical platform corresponding to the cylindrical platform model based on the vortex-induced load; The recording unit 507 is used to record the motion response data of the test cylindrical platform during the wave and current condition test.

[0070] It should be noted that the construction unit 501, the setting unit 502, the fixing unit 503, the simulation unit 504, the determination unit 505, the test unit 506 and the recorded processing and the beneficial effects thereof can be respectively referred to in Figure 1Steps S101 to S107 in the above are not described in detail.

[0071] Optionally, the construction unit 501 is further used for: According to the size of the cylindrical platform, a cylindrical platform model with the same model size as the cylindrical platform is constructed; Determine the circular diameter of the cylindrical platform model, determine the setting conditions that the target fixed position of the cylindrical platform model must meet, and determine the height condition of the three-dimensional numerical water pool to be constructed; wherein the target fixed position is the fixed position of the cylindrical platform model in the three-dimensional numerical water pool to be constructed, and the height condition is that the height of the three-dimensional numerical water pool to be constructed is higher than the design water level of the cylindrical platform model; According to the circular diameter of the cylindrical platform model, the setting conditions and the height conditions, the length, width and height of the three-dimensional numerical water pool to be constructed are determined, and the three-dimensional numerical water pool is constructed according to the determined length, width and height.

[0072] Optionally, the setting conditions include a first condition, a second condition and a third condition; wherein: The first condition includes: the target fixed position is located on the lower inner wall surface of the three-dimensional numerical water pool to be constructed, and the distance between the target fixed position and the left inner wall surface of the three-dimensional numerical water pool to be constructed is greater than 0 and not greater than a first distance, which is used to ensure that the cylindrical platform model successfully withstands the vortex-induced load in the vortex-induced motion simulation to be performed; wherein the first distance is the product of the circular surface diameter and a preset first positive integer; The second condition is that the distance between the target fixed position and the right inner wall of the three-dimensional numerical water pool to be constructed is not less than a second distance, which is used to ensure that the tail vortex of the cylindrical platform model in the vortex-induced motion simulation to be performed can be fully developed; the second distance is the product of the diameter of the circular surface and a preset second positive integer; The third condition is that the distance between the target fixed position and the front inner wall and the rear inner wall of the three-dimensional numerical water pool to be constructed is not less than the third distance, which is used to prevent the cylindrical platform model from being affected by the reflected waves of the front inner wall and the rear inner wall in the vortex-induced motion simulation to be carried out; the third distance is the product of the circular surface diameter and a preset third positive integer.

[0073] Optionally, the setting unit 502 is further configured to: The left wall and the right wall of the three-dimensional numerical water pool are defined as the inflow inlet and the pressure outlet, respectively, the lower inner wall of the three-dimensional numerical water pool is set as the free slip wall, and the front wall and the rear wall of the three-dimensional numerical water pool are set as symmetric boundaries, so as to obtain a target numerical water pool; The fixing unit 503 is further used for: Place and fix the cylindrical platform model to a position in the target numerical pool corresponding to the target fixed position.

[0074] Optionally, the simulation unit 504 is further configured to: Determine the design water level of the fixed cylindrical platform; A virtual water flow with a preset flow rate and a water level reaching the set water level is continuously delivered to the inflow inlet in the target numerical water pool, and the turbulent motion of the virtual water flow is simulated to simulate the ocean current with a preset flow rate in the target numerical water pool, thereby forming a corresponding flow field space and vortex-induced motion simulation of the fixed cylindrical platform model.

[0075] Optionally, the determining unit 505 is further configured to: The flow field space in the target numerical water pool is meshed, and the meshes of the fixed cylindrical platform model and the corresponding wake area in the flow field space are encrypted to obtain the meshing result; Based on the meshing results and numerical simulation algorithm, the vortex-induced loads borne by the fixed cylindrical platform model in the vortex-induced motion simulation are determined.

[0076] Optionally, the test unit 506 is further configured to: Based on a preset scale reduction ratio, a test cylindrical platform corresponding to the cylindrical platform model is constructed; wherein the scale ratio between the test cylindrical platform and the cylindrical platform model is the scale reduction ratio; Based on the scale reduction ratio, the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation is reduced to obtain the reduced vortex-induced load; In the wave and current condition test pool, inertial force is applied to the test cylindrical platform based on the wave generation method of the pool, and the reduced vortex-induced load is applied to the test cylindrical platform through the vortex-induced load application equipment arranged on the test cylindrical platform, so as to carry out wave and current condition test on the test cylindrical platform.

[0077] The cylindrical platform test device proposed in this embodiment can construct a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform; set the properties of each wall in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; fix the cylindrical platform model to the target numerical water pool, and simulate the ocean current with a preset flow rate in the target numerical water pool to simulate the vortex-induced motion of the fixed cylindrical platform model; determine the vortex-induced load that the fixed cylindrical platform model is borne in the vortex-induced motion simulation; based on the vortex-induced load, perform a wave and current condition test on the experimental cylindrical platform corresponding to the cylindrical platform model, and record the motion response data of the experimental cylindrical platform during the wave and current condition test. This embodiment can simulate the vortex-induced motion of the constructed cylindrical platform model, determine the vortex-induced load borne by the cylindrical platform, and when conducting a wave and current condition test on the experimental cylindrical platform, directly apply the reduced vortex-induced load to the experimental cylindrical platform through the vortex-induced load application equipment to simulate the ocean current effect received by the experimental cylindrical platform, without the need to simulate the ocean current in the wave and current condition test pool, thereby improving the accuracy of the vortex-induced load applied to the experimental cylindrical platform and effectively realizing equivalent simulation, thereby enhancing the accuracy of the test data and improving the safety of the cylindrical platform according to the test data.

[0078] The cylindrical platform test device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0079] The embodiment of the present invention also provides a computer device having the above Figure 5 The cylindrical platform test apparatus shown.

[0080] See also Figure 6, a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides part of the necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 A processor 10 is taken as an example.

[0081] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0082] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0083] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function. The data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0084] The memory 20 may include a volatile memory, such as a random access memory. The memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive. The memory 20 may also include a combination of the above-mentioned types of memory.

[0085] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0086] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cylindrical platform test method, characterized in that: include: According to the size of the cylindrical platform, a cylindrical platform model and a three-dimensional numerical water pool are constructed; Setting the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; The cylindrical platform model is fixed to the target numerical water pool, and an ocean current with a preset flow rate is simulated in the target numerical water pool to simulate vortex-induced motion of the fixed cylindrical platform model; Determining the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation; Based on the vortex-induced load, a wave-current working condition test is performed on the test cylindrical platform corresponding to the cylindrical platform model, and motion response data of the test cylindrical platform during the wave-current working condition test is recorded.

2. The method according to claim 1, characterized in that The method of constructing a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform includes: According to the size of the cylindrical platform, construct a cylindrical platform model with the same model size as the size of the cylindrical platform; Determine the diameter of the circular surface of the cylindrical platform model, determine the setting conditions that the target fixed position of the cylindrical platform model must meet, and determine the height condition of the three-dimensional numerical water pool to be constructed; wherein the target fixed position is the fixed position of the cylindrical platform model in the three-dimensional numerical water pool to be constructed, and the height condition is that the height of the three-dimensional numerical water pool to be constructed is higher than the design water level of the cylindrical platform model; The length, width and height of the three-dimensional numerical water pool to be constructed are determined according to the circular surface diameter of the cylindrical platform model, the set conditions and the height conditions, and the three-dimensional numerical water pool is constructed according to the determined length, width and height.

3. The method according to claim 2, characterized in that The set conditions include a first condition, a second condition and a third condition; wherein: The first condition includes: the target fixed position is located on the lower inner wall surface of the three-dimensional numerical water pool to be constructed, and the distance between the target fixed position and the left inner wall surface of the three-dimensional numerical water pool to be constructed is greater than 0 and not greater than a first distance, which is used to ensure that the cylindrical platform model successfully withstands the vortex-induced load in the vortex-induced motion simulation to be performed; wherein the first distance is the product of the diameter of the circular surface and a preset first positive integer; The second condition is that the distance between the target fixed position and the right inner wall of the three-dimensional numerical water pool to be constructed is not less than a second distance, which is used to ensure that the tail vortex of the cylindrical platform model in the vortex-induced motion simulation to be performed can be fully developed; the second distance is the product of the diameter of the circular surface and a preset second positive integer; The third condition is that the distance between the target fixed position and the front inner wall and the rear inner wall of the three-dimensional numerical water pool to be constructed is not less than a third distance, which is used to prevent the cylindrical platform model from being affected by the reflected waves of the front inner wall and the rear inner wall in the vortex-induced motion simulation to be performed; the third distance is the product of the diameter of the circular surface and a preset third positive integer.

4. The method according to claim 2 or 3, characterized in that: The setting of the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions includes: The left wall and the right wall of the three-dimensional numerical water pool are defined as the inflow inlet and the pressure outlet, respectively, the lower inner wall of the three-dimensional numerical water pool is set as the free sliding wall, and the front wall and the rear wall of the three-dimensional numerical water pool are set as symmetric boundaries, so as to obtain the target numerical water pool; The step of fixing the cylindrical platform model into the target numerical water pool comprises: The cylindrical platform model is placed and fixed at a position in the target value pool corresponding to the target fixed position.

5. The method according to claim 1, characterized in that The simulating of the ocean current of the preset flow rate in the target numerical water pool to simulate the vortex-induced motion of the fixed cylindrical platform model includes: Determining the design water level of the fixed cylindrical platform; A virtual water flow with a preset flow rate and a water level reaching the set water level is continuously delivered to the inflow inlet in the target numerical water pool, and turbulent motion simulation is performed on the virtual water flow to simulate an ocean current with a preset flow rate in the target numerical water pool, form a corresponding flow field space, and perform vortex-induced motion simulation on the fixed cylindrical platform model.

6. The method according to claim 5, characterized in that The step of determining the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation includes: Meshing the flow field space in the target numerical water pool, and encrypting the mesh of the cylindrical platform model and the corresponding wake area fixed in the flow field space to obtain a meshing result; Based on the meshing results and the numerical simulation algorithm, the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation is determined.

7. The method according to claim 1, characterized in that The step of performing a wave and flow condition test on the test cylindrical platform corresponding to the cylindrical platform model based on the vortex-induced load comprises: Based on a preset scale reduction ratio, constructing a test cylindrical platform corresponding to the cylindrical platform model; wherein the scale ratio between the test cylindrical platform and the cylindrical platform model is the scale reduction ratio; Based on the scale reduction ratio, the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation is reduced to obtain the reduced vortex-induced load; In a wave and current condition test pool, inertial force is applied to the test cylindrical platform based on the pool wave generation method, and the reduced vortex-induced load is applied to the test cylindrical platform through the vortex-induced load application equipment arranged on the test cylindrical platform, so as to carry out a wave and current condition test on the test cylindrical platform.

8. A cylindrical platform test device, characterized in that: include: A construction unit, used for constructing a cylindrical platform model and a three-dimensional numerical water pool according to the size of the cylindrical platform; A setting unit, used for setting the properties of each wall surface in the three-dimensional numerical water pool to obtain a target numerical water pool that meets the vortex-induced motion simulation conditions; A fixing unit, used for fixing the cylindrical platform model to the target value water pool; A simulation unit, used for simulating an ocean current of a preset flow rate in the target value water pool, so as to simulate vortex-induced motion of the fixed cylindrical platform model; A determination unit, used for determining the vortex-induced load borne by the fixed cylindrical platform model in the vortex-induced motion simulation; A test unit, used for performing a wave and flow condition test on the test cylindrical platform corresponding to the cylindrical platform model based on the vortex-induced load; The recording unit is used to record the motion response data of the test cylindrical platform during the wave and current condition test.

9. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are connected to communicate with each other, the memory stores computer instructions, and the processor executes the cylindrical platform test method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the cylindrical platform test method according to any one of claims 1 to 7.

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