Vortex-induced vibration simulation method and apparatus, computer device and storage medium
By establishing a three-dimensional finite element model and configuring physical field boundary conditions, and combining fluid and transient structure modules for simulation, the problem of low accuracy in vortex-induced vibration simulation of submarine cables was solved, and high-precision vortex-induced vibration characteristic simulation was achieved.
Patent Information
- Application Number
- PCT/CN2024/093193
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-08-11
- Filing Date
- 2024-05-14
- Publication Date
- 2025-11-27
AI Technical Summary
In existing technologies, the accuracy of vortex-induced vibration simulation models for submarine cables is low, and they cannot effectively simulate the real physical environment of seawater and submarine cables, resulting in inaccurate simulation results.
Based on the physical parameters of submarine cables and seawater, a three-dimensional finite element model is established, and the physical field boundary conditions of the target fluid domain and solid domain are configured. Simulation is performed through fluid module, transient structure module and coupling module to simulate the interaction between seawater and submarine cables and obtain highly accurate vortex-induced vibration characteristics.
A highly accurate simulation of the vortex-induced vibration characteristics of submarine cables in seawater was achieved, improving the accuracy and reliability of the simulation results.
Smart Images
Figure CN2024093193_27112025_PF_FP_ABST
Abstract
Description
Vortex-induced vibration simulation method and device, computer device and storage medium
[0001] Cross-reference to Related Applications
[0002] This application claims priority to the Chinese patent application No. 2023110156960, filed on August 11, 2023, and entitled "Vortex-induced vibration simulation method and device, computer device and storage medium", the entire content of which is incorporated herein by reference. TECHNICAL FIELD
[0003] The present application relates to the technical field of submarine cable simulation, in particular to a vortex-induced vibration simulation method, device, computer device, storage medium and computer program product. BACKGROUND
[0004] With the continuous promotion of the national marine strategy, China's offshore wind power has developed rapidly, with a surge in installed capacity, and submarine cables have gradually covered coastal wind farms. The environment in which submarine cables are located is relatively harsh. During daily operation, submarine cables are easily exposed or even suspended in seawater due to factors such as ocean current scouring. Suspended submarine cables are prone to vortex-induced vibration due to seawater scouring, which can cause wear, mechanical fatigue and other phenomena, seriously threatening the safe operation of submarine cables.
[0005] However, the inventors have realized that, at present, the vibration of submarine cables can be monitored using distributed optical fiber sensing technology, and simulation results can be obtained by combining finite element simulation analysis of a scaled-down model and a simplified model. However, due to the simplicity of the finite element simulation model, the accuracy of the mechanism and state characteristics of the vortex-induced vibration obtained is relatively low.
[0006] SUMMARY
[0007] According to various embodiments disclosed in the present application, a vortex-induced vibration simulation method, device, computer device, computer-readable storage medium and computer program product are provided.
[0008] A vortex-induced vibration simulation method includes:
[0009] Based on the physical parameters and size parameters of the submarine cable and the physical parameters of seawater, a three-dimensional finite element model is determined; the three-dimensional finite element model includes a target fluid domain and a target solid domain;
[0010] In the fluid module corresponding to the target fluid domain, a first physical field boundary condition corresponding to the target fluid domain is configured, and in the transient structure module corresponding to the target solid domain, a second physical field boundary condition corresponding to the target solid domain is configured; and
[0011] simulate, based on a target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and through the fluid module, the transient structure module and a coupling module, a vortex-induced vibration characteristic of the submarine cable; wherein the coupling module is configured to connect the fluid module and the transient structure module.
[0012] A vortex-induced vibration simulation device includes:
[0013] a model determination module configured to determine a three-dimensional finite element model based on physical parameters and size parameters of the submarine cable and physical parameters of seawater; the three-dimensional finite element model includes a target fluid domain and a target solid domain;
[0014] a configuration module configured to configure a first physical field boundary condition corresponding to the target fluid domain in a fluid module corresponding to the target fluid domain, and a second physical field boundary condition corresponding to the target solid domain in a transient structure module corresponding to the target solid domain; and
[0015] a simulation module configured to simulate, based on a target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and through the fluid module, the transient structure module and a coupling module, a vortex-induced vibration characteristic of the submarine cable; wherein the coupling module is configured to connect the fluid module and the transient structure module.
[0016] A computer device includes a memory and one or more processors, the memory stores computer readable instructions, and the computer readable instructions are executed by the processors to make the one or more processors execute the steps of the above method.
[0017] One or more computer readable storage media store computer readable instructions, and the computer readable instructions are executed by one or more processors to make the one or more processors execute the steps of the above method.
[0018] A computer program product. The computer program product includes a computer program, and the computer program is executed by a processor to implement the steps of the above method.
[0019] The vortex-induced vibration simulation method, device, computer equipment, computer readable storage medium and computer program product determine a three-dimensional finite element model based on physical parameters and size parameters of the submarine cable and physical parameters of seawater. The three-dimensional finite element model includes a target fluid domain and a target solid domain. In a fluid module corresponding to the target fluid domain, a first physical field boundary condition corresponding to the target fluid domain is configured, and in a transient structure module corresponding to the target solid domain, a second physical field boundary condition corresponding to the target solid domain is configured. Based on a target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and simulation through the fluid module, the transient structure module and a coupling module, vortex-induced vibration characteristics of the submarine cable are obtained. The coupling module is used to connect the fluid module and the transient structure module.
[0020] It can be known that based on the physical parameters and size parameters of the submarine cable and the physical parameters of seawater, a three-dimensional finite element model with the same size as the submarine cable can be obtained. Based on the target fluid domain and the target solid domain in the three-dimensional finite element model, the first physical field boundary condition and the second physical field boundary condition are configured to simulate the real physical environment of the interaction between seawater and the submarine cable. Based on the simulation control strategy, the target fluid domain corresponding to the seawater and the target solid domain corresponding to the submarine cable are simulated to obtain the vortex-induced vibration characteristics of the submarine cable in seawater, so that the vortex-induced vibration characteristics of the submarine cable with high accuracy are simulated.
[0021] The details of one or more embodiments of the present application are presented in the following drawings and description. Other features and advantages of the present application will become apparent from the description, drawings and claims. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0023] FIG. 1 is an application scenario diagram of a vortex-induced vibration simulation method according to one or more embodiments;
[0024] FIG. 2 is a flow diagram of a vortex-induced vibration simulation method according to one or more embodiments;
[0025] FIG. 3 is a flow diagram of a step of determining a three-dimensional finite element model according to one or more embodiments;
[0026] FIG. 4 is a flow diagram of a step of dividing a model according to one or more embodiments;
[0027] Fig. 5 is a flowchart of a step of configuring physical field boundary conditions according to one or more embodiments;
[0028] Fig. 6 is a flowchart of a step of determining vortex-induced vibration characteristics according to one or more embodiments;
[0029] Fig. 7 is a flowchart of a step of determining a corresponding curve of vortex-induced vibration characteristics according to one or more embodiments;
[0030] Fig. 8 is a flowchart of a vortex-induced vibration simulation method according to another embodiment;
[0031] Fig. 9 is a structural diagram of a cross section of a submarine cable model structure according to one or more embodiments;
[0032] Fig. 10 is a structural diagram of meshing of a target fluid domain and a target solid domain according to one or more embodiments;
[0033] Fig. 11 is a structural diagram of meshing of a target fluid domain and a target solid domain according to another embodiment;
[0034] Fig. 12 is a structural diagram of meshing of a target solid domain according to one or more embodiments;
[0035] Fig. 13 is a diagram of a time-domain curve of transverse amplitude according to one or more embodiments;
[0036] Fig. 14 is a diagram of a frequency distribution curve according to one or more embodiments;
[0037] Fig. 15 is a block diagram of a vortex-induced vibration simulation device according to one or more embodiments;
[0038] Fig. 16 is a block diagram of a computer device according to one or more embodiments. DETAILED DESCRIPTION
[0039] In order to make the technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.
[0040] The vortex-induced vibration simulation method provided in the application can be applied in an application environment as shown in FIG. 1. In the application environment, a terminal 102 communicates with a server 104 through a network, and the terminal 102 can upload the monitored physical parameters of seawater to the server. A data storage system can store data required to be processed by the server 104, such as physical parameters and size parameters of different types of submarine cables. The data storage system can be integrated on the server 104, or placed on a cloud or other network server. The terminal 102 can be, but is not limited to, various monitoring devices, sensors, computers, laptops, smart phones, and tablet computers. The server 104 can be implemented by an independent server or a server cluster composed of multiple servers.
[0041] In one embodiment, as shown in FIG. 2, a vortex-induced vibration simulation method is provided. The vortex-induced vibration simulation method is described by taking the server in FIG. 1 as an example, and includes the following steps:
[0042] In step S202, a three-dimensional finite element model is determined based on the physical parameters and size parameters of the submarine cable and the physical parameters of seawater. The finite element model is a model established by using a finite element analysis method, and is a combination of units connected only at nodes, transmitting force only through nodes, and constrained only at nodes. The three-dimensional finite element model includes a target fluid domain and a target solid domain. The three-dimensional finite element model is a model obtained by three-dimensional modeling of the submarine cable and seawater. For example, the target fluid domain can correspond to seawater, and the target solid domain can correspond to the submarine cable.
[0043] That is, the target fluid domain in the three-dimensional finite element model can be modeled by the physical parameters of seawater, and the target solid domain in the three-dimensional finite element model can be modeled by the physical parameters and size parameters of the submarine cable. The submarine cable can include various component structures, each component structure having different size parameters and physical parameters. For example, each component structure can be a copper conductor, an insulator, an optical fiber, a steel sheath, a filler layer, a steel wire armor layer, and the like. The physical parameters can be density, Poisson's ratio, elastic modulus, dynamic viscosity, and the like. The physical parameters of seawater can be density. The size parameters of the submarine cable can be thickness, outer diameter, and the like.
[0044] Specifically, the server can obtain the physical parameters and size parameters corresponding to the submarine cable of the specified model from the database, and based on the physical parameters and size parameters, establish a three-dimensional finite element model of the submarine cable of the specified model as a target solid domain; the server can obtain the physical parameters of seawater from the seawater sensor, and based on the physical parameters, establish a three-dimensional finite element model of seawater as a target fluid domain. The server can determine the model corresponding to the target solid domain and determine the model corresponding to the target fluid domain, based on which the server can obtain a three-dimensional finite element model based on the model corresponding to the target solid domain and the model corresponding to the target fluid domain. Optionally, the target fluid domain in the three-dimensional finite element model can be a cuboid as long as the submarine cable, which wraps the submarine cable, and the submarine cable is the target solid domain.
[0045] In step S204, a first physical field boundary condition corresponding to the target fluid domain is configured in the fluid module corresponding to the target fluid domain, and a second physical field boundary condition corresponding to the target solid domain is configured in the transient structure module corresponding to the target solid domain. The first physical field boundary condition is a first physical field boundary condition added by the server in the fluid module when simulating vortex-induced vibration, for limiting the target fluid domain; the second physical field boundary condition is a second physical field boundary condition added in the transient structure module, for limiting the target solid domain; the first physical field boundary condition and the second physical field boundary condition are used to simulate the interaction between seawater and the submarine cable in the real environment. The fluid module is a program module for simulating fluid phenomena, and the transient structure module is a program module for simulating the dynamic response of the structure with time. Specifically, after establishing the three-dimensional finite element model, the server can configure the first physical field boundary condition corresponding to the target fluid domain in the fluid module corresponding to the target fluid domain, to simulate the fluid phenomena of the target fluid domain; the server can configure the second physical field boundary condition corresponding to the target solid domain in the transient structure module corresponding to the target solid domain, to simulate the dynamic response of the target solid domain.
[0046] Optionally, the second physical field boundary condition can be the movement direction of the target solid domain, the temperature of the target solid domain, etc., which are configured in the transient structure module corresponding to the target solid domain; the first physical field boundary condition can be the flow velocity of the target fluid domain, the temperature of the target fluid domain, etc., which are configured in the fluid module corresponding to the target fluid domain.
[0047] In one of the examples, the server can configure the first physical field boundary condition and the second physical field boundary condition corresponding to the seawater environment and the submarine cable for simulating different seawater environments and submarine cables. Among them, vortex-induced vibration is a wind-induced vibration phenomenon of long-span bridges at low wind speed. From the perspective of fluid, any non-streamlined object will produce alternating vortexes that detach from the surface of the structure on both sides of the object at a certain constant flow rate. Correspondingly, the submarine cable and the long-span bridge can also be regarded as a bridge in the sea, and water-induced vibration occurs under the action of seawater, so vortex-induced vibration can also occur between the submarine cable and the seawater.
[0048] In step S206, the vortex-induced vibration characteristics of the submarine cable are obtained based on the target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and the simulation by the fluid module, the transient structure module, and the coupling module. The coupling module is used to connect the fluid module and the transient structure module, and is used for data interaction between the fluid module and the transient structure module during simulation. Specifically, the coupling module can enable the fluid module and the transient structure module to fully interact with real-time simulation data during simulation, and constantly change the simulation results output by the fluid module and the transient structure module based on the simulation data, to obtain accurate vortex-induced vibration characteristics based on the output simulation results.
[0049] Specifically, after configuring the first physical field boundary condition and the second physical field boundary condition, the server can promote the fluid module and the transient structure module to perform energy conversion through the target simulation control strategy. The target simulation control strategy can be a control equation, which can be divided into a control equation of the fluid module and a control equation of the transient structure module. For the fluid module, the flow is controlled by three basic physical principles, namely the law of conservation of mass, Newton's second law, and the law of conservation of energy. These three basic physical principles correspond to three control equations, namely the control equations of fluid mechanics (continuity equation, momentum equation, and energy equation). For the transient structure module, based on this, the server can control the vibration of the target solid domain based on the stress transmitted by the fluid module and the control equation of transient dynamics, to determine the vortex-induced vibration characteristics of the submarine cable.
[0050] Based on this, the server simulates the vortex-induced vibration by inputting the physical parameters and material parameters of the target fluid domain into the fluid module and inputting the physical parameters and material parameters of the target solid domain into the transient structure module. The server simulates the fluid module based on the target simulation control strategy and the first physical field boundary condition, simultaneously, the server simulates the transient structure module based on the target simulation control strategy and the second physical field boundary condition, and the server simulates the coupling module based on the target simulation control strategy, the real-time simulation data of the fluid module and the real-time simulation data of the transient structure module, and obtains the vortex-induced vibration characteristics of the submarine cable output by the transient structure module based on the multiple interactions of the real-time simulation data of the fluid module and the real-time simulation data of the transient structure module. In this way, the server can perform fluid dynamics and transient dynamics analysis through the fluid module and the transient structure module, simulate the displacement, strain, stress and the like of the fluid and structure changing over time, and realize the simulation of the vortex-induced vibration.
[0051] Based on the above vortex-induced vibration simulation method, it can be known that based on the physical parameters and size parameters of the submarine cable and the physical parameters of the seawater, a three-dimensional finite element model with the same real size as the submarine cable can be obtained; and based on the target fluid domain and the target solid domain in the three-dimensional finite element model, the first physical field boundary condition and the second physical field boundary condition are configured to simulate the real physical environment of the interaction between the seawater and the submarine cable, and then based on the simulation control strategy, the target fluid domain corresponding to the seawater and the target solid domain corresponding to the submarine cable are simulated to obtain the vortex-induced vibration characteristics of the submarine cable in the seawater, thereby achieving the effect of simulating the high-accuracy vortex-induced vibration characteristics of the submarine cable.
[0052] In the above vortex-induced vibration simulation method, it can be known that based on the physical parameters and size parameters of the submarine cable and the physical parameters of the seawater, a three-dimensional finite element model with the same real size as the submarine cable can be obtained; and based on the target fluid domain and the target solid domain in the three-dimensional finite element model, the first physical field boundary condition and the second physical field boundary condition are configured to simulate the real physical environment of the interaction between the seawater and the submarine cable, and then based on the simulation control strategy, the target fluid domain corresponding to the seawater and the target solid domain corresponding to the submarine cable are simulated to obtain the vortex-induced vibration characteristics of the submarine cable in the seawater, thereby achieving the effect of simulating the high-accuracy vortex-induced vibration characteristics of the submarine cable.
[0053] In one of the embodiments, as shown in FIG. 3, based on the physical parameters and size parameters of the submarine cable and the physical parameters of the seawater, the step of determining the three-dimensional finite element model includes: step S302, determining the target solid domain corresponding to the submarine cable according to the physical parameters and size parameters of the submarine cable. Step S304, determining the target fluid domain corresponding to the seawater according to the physical parameters of the seawater, and determining the target solid domain and the target fluid domain as the three-dimensional finite element model.
[0054] The three-dimensional finite element model includes a target fluid domain and a target solid domain, and is a model obtained by three-dimensional modeling of the submarine cable and seawater. The target fluid domain corresponds to seawater, and the target solid domain corresponds to the submarine cable. The target fluid domain in the three-dimensional finite element model can be modeled by physical parameters of seawater, and the target solid domain in the three-dimensional finite element model can be modeled by physical parameters and size parameters of the submarine cable.
[0055] In one example, the submarine cable includes a plurality of component structures, each component structure having different size parameters and physical parameters. For example, the component structures can be copper conductors, insulators, optical fibers, steel sheaths, filler layers, steel wire armor layers, etc., and the physical parameters can be density, Poisson's ratio, elastic modulus, dynamic viscosity, etc. The physical parameters of seawater can be density. The size parameters of the submarine cable can be thickness, outer diameter, etc. Therefore, the server can determine the model corresponding to the target solid domain according to the size parameters and physical parameters of each component structure of the submarine cable, and determine the model corresponding to the target fluid domain according to the physical parameters of seawater, thereby obtaining the entire three-dimensional finite element model.
[0056] Specifically, the server can obtain the physical parameters and size parameters corresponding to the submarine cable of a specified model from the database, and establish a three-dimensional finite element model of the submarine cable of the specified model based on the physical parameters and size parameters, and take the three-dimensional finite element model of the submarine cable of the specified model as the target solid domain. The server can obtain the physical parameters of seawater from the seawater sensor, and establish a three-dimensional finite element model of seawater based on the physical parameters, and take the three-dimensional finite element model of seawater as the target fluid domain.
[0057] In this embodiment, the target solid domain is determined by the physical parameters and size parameters of the submarine cable, and the target fluid domain is determined by the physical parameters of seawater, which can achieve the effect of establishing a three-dimensional finite element model of a submarine cable with real size and material.
[0058] In one of the embodiments, as shown in FIG. 4, before the step of configuring the first physical field boundary condition of the target fluid domain corresponding to the fluid module of the target fluid domain, the specific implementation process of the vortex-induced vibration simulation method further includes: step S402, based on the fluid module corresponding to the initial fluid domain, the initial fluid domain is divided to determine the target fluid domain containing a plurality of fluid grids. Step S404, based on the transient structure module corresponding to the initial solid domain, the initial solid domain is divided to determine the target solid domain containing a plurality of solid grids. Wherein, the fluid grid is obtained by dividing the target fluid domain through the fluid module, and the solid grid is obtained by dividing the target solid domain through the transient structure module. There is a grid division function in the fluid module, which is used to divide the initial fluid domain to obtain the divided target fluid domain; there is also a grid division function in the transient structure module, which is used to divide the initial solid domain to obtain the divided target solid domain.
[0059] Specifically, before performing finite element analysis on the three-dimensional finite element model, the server can perform grid division on the three-dimensional finite element model to obtain a three-dimensional finite element model containing a plurality of grids. There is a correlation between the number of grids and the accuracy of the calculation result, and the calculation accuracy will be improved with the increase of the number of grids. The server can perform grid division on the initial fluid domain in the three-dimensional finite element model based on the division function of the fluid module to obtain a target fluid domain containing a plurality of fluid grids; the server can perform grid division on the initial solid domain in the three-dimensional finite element model based on the division function of the transient structure module to obtain a target fluid domain containing a plurality of solid grids.
[0060] Optionally, the server can use a mapping method to perform structured grid division on the target fluid domain, and can also divide the fluid domain into an inner flow domain and an outer flow domain, wherein the number of grids in the inner flow domain is large and the density is large, and the number of grids in the outer flow domain is small and the density is small; dividing the target fluid domain into an inner flow domain and an outer flow domain can ensure the simulation accuracy while saving computing resources, in addition, a boundary layer grid can be divided on the fluid-structure coupling boundary, wherein the fluid-structure coupling boundary is the intersection position of the target fluid domain and the target solid domain. Optionally, step S402 and step S404 are two independent steps, which can be implemented at the same time, therefore, the execution order of step S402 and step S404 can be adjusted as needed.
[0061] In this embodiment, the fluid module and the transient structure module are used to perform grid division on the initial fluid domain and the initial solid domain respectively to obtain the target fluid domain and the target solid domain, and the grid division can improve the simulation efficiency and the simulation quality.
[0062] In one of the embodiments, the specific implementation process of the step of "dividing the initial solid domain based on the transient structure module corresponding to the initial solid domain to determine the target solid domain containing a plurality of solid grids" includes: respectively dividing each component structure corresponding to the initial solid domain according to the grid division method corresponding to each component structure of the submarine cable to obtain the target solid domain containing a plurality of solid grids. Since the submarine cable is composed of multiple component structures, the materials of each structure are different, and in order to truly represent the characteristics of various materials during simulation, different grid division methods can be assigned to each structure. Based on this, the server can pre-set the grid division method corresponding to each component structure of the submarine cable, and perform grid division of the target solid domain through the grid division method corresponding to each component structure.
[0063] Specifically, the grid division method corresponding to each component structure can include a sweep method, a mapping method, a patch conforming method, etc. Among them, the server uses the sweep method to divide the grid for the twisted structures such as the copper conductor, the insulating layer, the optical fiber and the steel sheath corresponding to the target solid domain, uses the mapping method to divide the grid for the steel wire armor layer and the outer sheath corresponding to the target solid domain, and uses the patch conforming method to divide the grid for the filling layer corresponding to the target solid domain to obtain the target solid domain containing a plurality of solid grids.
[0064] In this embodiment, by respectively dividing the grid using different division methods for the multiple component structures of the submarine cable, the quality of the grid division can be improved.
[0065] In one of the embodiments, as shown in FIG. 5, for the step of configuring the first physical field boundary condition corresponding to the target fluid domain in the fluid module corresponding to the target fluid domain and configuring the second physical field boundary condition corresponding to the target solid domain in the transient structure module corresponding to the target solid domain, the specific implementation process includes:
[0066] In step S502, the structure parameters and the motion parameters are determined in the fluid module corresponding to the target fluid domain. The structure parameters include a fluid inlet, a fluid outlet, and a fluid wall, and the motion parameters include a fluid velocity, a fluid gravity, and a fluid buoyancy. The fluid inlet is a structure through which the fluid flows in, the fluid outlet is a structure through which the fluid flows out, and the fluid wall is used to limit the width of the fluid. The fluid can flow in from the fluid inlet and flow out from the fluid outlet. In one example, the first physical field boundary condition can further include a fluid velocity of the fluid configured by the server when the fluid flows; in other examples, the first physical field boundary condition can further include the gravity and the buoyancy of the fluid itself. Specifically, the server determines the fluid inlet, the fluid outlet, and the fluid wall, and the fluid velocity, the fluid gravity, and the fluid buoyancy in the fluid module corresponding to the target fluid domain. It should be understood that the structure parameters can have other implementation manners in addition to the fluid inlet, the fluid outlet, and the fluid wall described above, and the motion parameters can have other implementation manners in addition to the fluid velocity, the fluid gravity, and the fluid buoyancy, which are not limited here.
[0067] In step S504, the gravity parameter is determined in the transient structure module corresponding to the target solid domain, and a fixed structure of the submarine cable is configured. The gravity parameter can be the gravity of the target solid domain, and the fixed structure can include fixed substructures corresponding to two ends of the submarine cable respectively, and the fixed substructure can be a fixed support structure. The fixed substructure is used to simulate the suspended state of the submarine cable in seawater. The fixed structure can further include a plurality of fixed substructures, and the submarine cable can be fixed according to user demand. Specifically, the server determines the gravity parameter corresponding to the target solid domain, for example, the mass of the submarine cable, in the transient structure module corresponding to the target solid domain, and configures the fixed structure of the submarine cable, so as to fix the submarine cable in seawater. Optionally, as one embodiment, the server can set a fluid-structure coupling interface to transfer the interaction information of the fluid module and the transient structure module, and take the fluid-structure coupling interface as the physical field boundary condition.
[0068] In this embodiment, the physical field boundary conditions are configured by the fluid module and the transient structure module, and the grid is divided by a plurality of component structures using different division methods, which can improve the quality of grid division.
[0069] In one embodiment, as shown in FIG. 6, for the step of “based on the target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and simulation by the fluid module, the transient structure module, and the coupling module, obtaining the vortex-induced vibration characteristics of the submarine cable”, the specific implementation process includes:
[0070] In step S602, based on the target simulation control strategy, the first physical field boundary condition, and the second physical field boundary condition, the fluid module and the transient structure module are enabled to interact data through the coupling module, and a simulation result output by the transient structure module is obtained. In step S604, based on the simulation result output by the transient structure module, a vortex-induced vibration feature of the submarine cable is determined.
[0071] The target simulation control strategy can be a control equation, which can be divided into a control equation of the fluid module and a control equation of the transient structure module. After the first physical field boundary condition and the second physical field boundary condition are configured, the fluid module and the transient structure module can be enabled to perform energy conversion based on the target simulation control strategy. The control equation corresponding to the target simulation control strategy can be divided into a control equation of the fluid module and a control equation of the transient structure module.
[0072] Specifically, when the server performs simulation, the fluid module and the transient structure module can be simulated simultaneously, and the simulation data of the fluid module and the transient structure module can be interacted through the coupling module. The server can transmit the simulation data output by the fluid module to the transient structure module through the coupling module. The transient structure module can perform simulation processing based on the received simulation data output by the fluid module, and obtain simulation data output by the transient structure module. Based on this, the server can also transmit the simulation data output by the transient structure module to the fluid module through the coupling module, so that the fluid module performs simulation based on the received simulation data output by the transient structure module. Through multiple data interactions between the fluid module and the transient structure module, the simulation result after the interaction of the fluid module and the transient structure module can be obtained. Based on this, the server can obtain the vortex-induced vibration feature of the submarine cable. In one example, the vortex-induced vibration feature of the submarine cable can be obtained from the simulation result output by the transient structure module.
[0073] In this embodiment, the fluid module and the transient structure module are associated through the coupling module. During simulation, the data in the fluid module and the transient structure module can be fully interacted, and the vortex-induced vibration simulation accuracy can be improved.
[0074] In one embodiment, as shown in FIG. 7, after the vortex-induced vibration simulation method is implemented, the process further includes:
[0075] At step S702, the vortex-induced vibration characteristics of the submarine cable are processed based on a curve generation algorithm to obtain a lateral amplitude time-domain curve corresponding to the vortex-induced vibration characteristics of the submarine cable. At step S704, the lateral amplitude time-domain curve is subjected to Fourier transform based on a Fourier transform algorithm to obtain a frequency distribution curve corresponding to the vortex-induced vibration characteristics of the submarine cable. The curve generation algorithm can be a statistical algorithm of vortex-induced vibration lateral amplitude per unit time, and the curve generation algorithm is used to generate the lateral amplitude time-domain curve corresponding to the vortex-induced vibration characteristics of the submarine cable.
[0076] Specifically, when simulating, the server sets the coupling solver, sets the total simulation time and the simulation step, and thus the vortex-induced vibration lateral amplitude per unit time can be counted through the total simulation time and the simulation step to obtain the lateral amplitude time-domain curve as shown in FIG. 13. In one example, the coupling solver is set with a simulation step and a total simulation time. To ensure better convergence of the fluid-structure coupling simulation iteration process and ensure the simulation accuracy, the simulation step is set to a small value. The server can also convert the lateral amplitude time-domain curve into a frequency distribution curve as shown in FIG. 14 through a Fourier transform algorithm.
[0077] In this embodiment, the lateral amplitude time-domain curve and the frequency distribution curve corresponding to the vortex-induced vibration characteristics of the submarine cable can be obtained through the curve generation algorithm and the Fourier transform algorithm, thereby achieving the effect of generating multiple vortex-induced vibration characteristics.
[0078] As shown in FIG. 8, the specific execution process of the vortex-induced vibration simulation is described in detail below in combination with one specific embodiment, including the following steps:
[0079] At step one, the geometric structure and size parameters of the submarine cable are imported, and the physical parameters of the materials of each structural layer of the submarine cable and the seawater are input. The size parameters of each layer of the submarine cable are shown in Table 1, and the physical parameters of the materials of each layer of the submarine cable are shown in Table 2.
[0080] Table 1
[0081] Table 2
[0082] At step two, a three-dimensional finite element simulation model of the vortex-induced vibration of the actual size submarine cable is established as shown in FIGS. 9 and 10. As shown in FIG. 9, the cross section of the cable model structure is composed of a copper conductor 1, an insulation layer 2, a filling layer 3, an optical fiber 4, a steel sheath 5, a steel wire armor layer 6, and an outer sheath layer 7. As shown in FIG. 10, the target fluid domain is a cuboid equal in length to the submarine cable.
[0083] Step three, based on the three-dimensional finite element simulation model established in step two, the grid division of the target fluid domain and the target solid domain is carried out in the fluid module and the transient structure module respectively. The structured grid division is carried out by using the mapping method for the target fluid domain, and at the same time the target fluid domain is divided into the inner flow domain 8 and the outer flow domain 9. The inner flow domain grid is refined, which saves the calculation resources while ensuring the simulation accuracy, and the boundary layer grid is divided for the fluid-structure coupling boundary. Different grid division methods are used for each structure of the submarine cable model. The sweep method is used to divide the grid for the twisted structures such as the copper conductor 1, the insulating layer 2, the optical fiber 4 and the steel sheath 5. The mapping method is used to divide the grid for the steel wire armor layer 6 and the outer sheath layer 7. Finally, the patch conforming method is used to divide the grid for the filler layer. The final division effect is shown in Figures 10, 11 and 12.
[0084] Step four, the physical field boundary conditions of the three-dimensional finite element simulation model are set in the fluid module and the transient structure module respectively, as shown in Figure 11. The inlet 10, the outlet 11 and the wall 12 are set for the fluid domain, the water flow velocity is set and the gravity and the buoyancy are applied to the seawater. The gravity is applied to the submarine cable model, and the fixed support is set at both ends to simulate the suspended state of the submarine cable in the actual vortex-induced vibration. Finally, the fluid-structure coupling interface is set to transfer the interaction information between the fluid module and the transient structure module.
[0085] Step five, the following control equations are established in the fluid module:
[0086] Wherein, k represents the turbulent kinetic energy, ω represents the dissipation ratio; G k represents the turbulent kinetic energy generated due to the average velocity gradient; G ω represents the generation of dissipation ratio; Γ k and Γ ω represent the effective diffusion rate of k and ω; Y k and Y ω represent the dissipation of turbulence and the dissipation caused by turbulence.
[0087] The following control equations are established in the transient structure module:
[0088] Wherein, u is the displacement vector; ε is the strain; σ is the stress; I is the unit tensor; E is the elastic modulus; v is the Poisson's ratio; a is the acceleration.
[0089] Step six, the required results such as the vortex-induced vibration transverse amplitude are set in the fluid module and the transient structure module respectively, and the coupling solver is set. The total simulation time is set to 5s and the simulation step is set to 0.0025s.
[0090] Step seven, coupling simulation is performed on the coupling module, and then the simulation results are extracted and post-processed to obtain the vortex-induced vibration transverse amplitude time-domain curve of the submarine cable, the vortex-induced vibration frequency distribution curve of the submarine cable, and the like, as shown in FIGS. 13 and 14.
[0091] It should be understood that, although each step in the flowchart involved in each of the above embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.
[0092] In one of the embodiments, as shown in FIG. 15, a vortex-induced vibration simulation device 1500 is provided, comprising a model determination module 1501, a configuration module 1502 and a simulation module 1503, wherein:
[0093] The model determination module 1501 is configured to determine a three-dimensional finite element model based on the physical parameters and size parameters of the submarine cable and the physical parameters of seawater; the three-dimensional finite element model comprises a target fluid domain and a target solid domain;
[0094] The configuration module 1502 is configured to configure a first physical field boundary condition corresponding to the target fluid domain in a fluid module corresponding to the target fluid domain, and configure a second physical field boundary condition corresponding to the target solid domain in a transient structure module corresponding to the target solid domain; and
[0095] The simulation module 1503 is configured to obtain the vortex-induced vibration characteristics of the submarine cable based on a target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and simulation through the fluid module, the transient structure module and the coupling module; wherein the coupling module is configured to connect the fluid module and the transient structure module.
[0096] In one of the embodiments, the model determination module 1501 is specifically configured to determine a target solid domain corresponding to the submarine cable according to the physical parameters and size parameters of the submarine cable; and determine a target fluid domain corresponding to seawater according to the physical parameters of the seawater, and determine the target solid domain and the target fluid domain as the three-dimensional finite element model.
[0097] In one of the embodiments, the vortex-induced vibration simulation apparatus further comprises a division module, which is specifically configured to: divide the initial fluid domain based on the fluid module corresponding to the initial fluid domain to determine the target fluid domain comprising a plurality of fluid grids; and divide the initial solid domain based on the transient structure module corresponding to the initial solid domain to determine the target solid domain comprising a plurality of solid grids.
[0098] In one of the embodiments, the division module is further specifically configured to: divide each component structure corresponding to the initial solid domain according to the grid division method corresponding to each component structure of the submarine cable to obtain the target solid domain comprising a plurality of solid grids.
[0099] In one of the embodiments, the configuration module 1502 is specifically configured to: determine the structure parameters and the motion parameters in the fluid module corresponding to the target fluid domain, wherein the structure parameters comprise a fluid inlet, a fluid outlet and a fluid wall, and the motion parameters comprise a fluid velocity, a fluid gravity and a fluid buoyancy; and determine the gravity parameters in the transient structure module corresponding to the target solid domain, and configure the fixed structure of the submarine cable.
[0100] In one of the embodiments, the simulation module 1503 is specifically configured to: enable the fluid module and the transient structure module to interact with each other through the coupling module based on the target simulation control strategy, the first physical field boundary condition and the second physical field boundary condition to obtain the simulation result output by the transient structure module; and determine the vortex-induced vibration characteristics of the submarine cable based on the simulation result output by the transient structure module.
[0101] In one of the embodiments, the vortex-induced vibration simulation apparatus further comprises a curve generation module, which is specifically configured to: process the vortex-induced vibration characteristics of the submarine cable based on a curve generation algorithm to obtain the transverse amplitude time-domain curve corresponding to the vortex-induced vibration characteristics of the submarine cable; and perform Fourier transform on the transverse amplitude time-domain curve based on a Fourier transform algorithm to obtain the frequency distribution curve corresponding to the vortex-induced vibration characteristics of the submarine cable.
[0102] The specific limitations of the vortex-induced vibration simulation apparatus can be referred to the limitations of the vortex-induced vibration simulation method in the foregoing, which will not be described herein. Each module in the vortex-induced vibration simulation apparatus described above can be realized by software, hardware and combinations thereof in whole or in part. Each module described above can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to each module.
[0103] In one of the embodiments, a computer device is provided, which can be a server, and an internal structure diagram of the computer device can be as shown in FIG. 16. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile or volatile storage medium and an internal memory. The non-volatile or volatile storage medium stores an operating system, computer readable instructions and a database. The internal memory provides an environment for running the operating system and the computer readable instructions in the non-volatile storage medium. The database of the computer device is configured to store physical parameters and dimensional parameters of the submarine cable, physical parameters of seawater, vortex-induced vibration characteristics of the submarine cable, simulation control strategies and physical field boundary condition data. The network interface of the computer device is configured to communicate with an external terminal through a network connection. The computer readable instructions are executed by the processor to implement a vortex-induced vibration simulation method.
[0104] Those skilled in the art can understand that the structure shown in FIG. 16 is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.
[0105] A computer device includes a memory and one or more processors, and the memory stores computer readable instructions. The computer readable instructions are executed by the processor to cause the one or more processors to perform the steps of the method.
[0106] One or more computer readable storage media storing computer readable instructions, which are executed by one or more processors to cause the one or more processors to perform the steps of the method.
[0107] The computer readable storage medium can be non-volatile or volatile.
[0108] A computer program product. The computer program product includes a computer program, which is executed by a processor to implement the steps of the method.
[0109] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through computer readable instructions, and the computer readable instructions can be stored in a computer readable storage medium. When the computer readable instructions are executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, databases, or other media in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.
[0110] The technical features of the above embodiments can be combined in any way. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.
[0111] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.
Claims
1. A method for simulating vortex-induced vibration, comprising: determining a three-dimensional finite element model based on physical parameters and size parameters of a submarine cable and physical parameters of seawater; the three-dimensional finite element model comprising a target fluid domain and a target solid domain; configuring a first physical field boundary condition corresponding to the target fluid domain in a fluid module corresponding to the target fluid domain, and configuring a second physical field boundary condition corresponding to the target solid domain in a transient structure module corresponding to the target solid domain; and based on a target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and simulation through the fluid module, the transient structure module and a coupling module, obtaining vortex-induced vibration characteristics of the submarine cable; wherein the coupling module is used to connect the fluid module and the transient structure module. The determination of the three-dimensional finite element model based on the physical parameters and size parameters of the submarine cable and the physical parameters of the seawater comprises:
2. The method of claim 1, wherein, determining a target solid domain corresponding to the submarine cable according to the physical parameters and size parameters of the submarine cable; and determining a target fluid domain corresponding to the seawater according to the physical parameters of the seawater, determining the target solid domain and the target fluid domain as the three-dimensional finite element model. Before the configuration of the first physical field boundary condition corresponding to the target fluid domain in the fluid module corresponding to the target fluid domain, the method further comprises:
3. The method of claim 1, wherein, dividing an initial fluid domain based on a fluid module corresponding to the initial fluid domain to determine a target fluid domain containing a plurality of fluid grids; and dividing an initial solid domain based on a transient structure module corresponding to the initial solid domain to determine a target solid domain containing a plurality of solid grids. The division of the initial solid domain based on the transient structure module corresponding to the initial solid domain to determine the target solid domain containing a plurality of solid grids comprises:
4. The method of claim 3, wherein, dividing each component structure corresponding to the initial solid domain according to a grid division method corresponding to each component structure of the submarine cable to obtain the target solid domain containing a plurality of solid grids. The configuration of the first physical field boundary condition corresponding to the target fluid domain in the fluid module corresponding to the target fluid domain, and the configuration of the second physical field boundary condition corresponding to the target solid domain in the transient structure module corresponding to the target solid domain comprises:
5. The method of claim 1, wherein, determining structure parameters and motion parameters in the fluid module corresponding to the target fluid domain, the structure parameters including a fluid inlet, a fluid outlet and a fluid wall, and the motion parameters including a fluid velocity, a fluid gravity and a fluid buoyancy; and determining a gravity parameter in the transient structure module corresponding to the target solid domain, and configuring a fixed structure of the submarine cable. The simulation based on the target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and through the fluid module, the transient structure module and the coupling module to obtain the vortex-induced vibration characteristics of the submarine cable comprises:
6. The method of claim 1, wherein, based on the target simulation control strategy, the first physical field boundary condition, and the second physical field boundary condition, to enable the fluid module and the transient structure module to interact with each other through the coupling module, and obtain a simulation result output by the transient structure module; and based on the simulation result output by the transient structure module, to determine a vortex-induced vibration feature of the submarine cable.
7. The method of claim 1, wherein, After the simulation based on the target simulation control strategy, the first physical field boundary condition, and the second physical field boundary condition, and through the fluid module, the transient structure module, and the coupling module, to obtain the vortex-induced vibration feature of the submarine cable, the method further includes: based on a curve generation algorithm, to process the vortex-induced vibration feature of the submarine cable, and obtain a transverse amplitude time-domain curve corresponding to the vortex-induced vibration feature of the submarine cable; and based on a Fourier transform algorithm, to perform Fourier transform on the transverse amplitude time-domain curve, and obtain a frequency distribution curve corresponding to the vortex-induced vibration feature of the submarine cable.
8. A vortex-induced vibration simulation device, comprising: a model determination module configured to determine a three-dimensional finite element model based on physical parameters and size parameters of a submarine cable, and physical parameters of seawater; the three-dimensional finite element model includes a target fluid domain and a target solid domain; a configuration module configured to configure, in a fluid module corresponding to the target fluid domain, a first physical field boundary condition corresponding to the target fluid domain, and in a transient structure module corresponding to the target solid domain, a second physical field boundary condition corresponding to the target solid domain; and a simulation module configured to, based on a target simulation control strategy, the first physical field boundary condition, and the second physical field boundary condition, perform simulation through the fluid module, the transient structure module, and a coupling module to obtain a vortex-induced vibration feature of the submarine cable; wherein the coupling module is configured to connect the fluid module and the transient structure module.
9. A computer device comprising a memory and one or more processors, the memory storing computer readable instructions, the computer readable instructions being executed by the one or more processors to cause the one or more processors to perform the steps of the method of any one of claims 1 to 7.
10. One or more computer readable storage media storing computer readable instructions, the computer readable instructions being executed by one or more processors to cause the one or more processors to perform the steps of the method of any one of claims 1 to 7.