Vortex-induced vibration simulation method and apparatus, computer device and storage medium

Abstract

The present application relates to the technical field of submarine cable simulation, and particularly relates to a vortex-induced vibration simulation method. The method comprises: on the basis of physical parameters and dimension parameters of a submarine cable and physical parameters of seawater, determining a three-dimensional finite element model, wherein the three-dimensional finite element model comprises a target fluid domain and a target solid domain; in a fluid module corresponding to the target fluid domain, configuring a first physical field boundary condition corresponding to the target fluid domain, and in a transient structure module corresponding to the target solid domain, configuring a second physical field boundary condition corresponding to the target solid domain; and on the basis of a target simulation control strategy, the first physical field boundary condition and the second physical field boundary condition, and by means of the fluid module, the transient structure module and a coupling module, performing simulation to obtain a vortex-induced vibration feature of the submarine cable, wherein the coupling module is used for connecting the fluid module to the transient structure module.

Description

Vortex-induced vibration simulation method, device, computer equipment and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on August 11, 2023, with application number 2023110156960, and application name “Vortex-induced vibration simulation method, device, computer equipment and storage medium”, all contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of submarine cable simulation, and in particular to a vortex-induced vibration simulation method, apparatus, computer equipment, storage medium, and computer program product. Background Art

[0004] With the continued advancement of my country's national marine strategy, offshore wind power has developed rapidly in China, with installed capacity surging. Submarine cables are gradually covering coastal wind farms. Submarine cables operate in a relatively harsh environment. During daily operation, they are easily exposed or even suspended in the sea due to factors such as ocean currents. The erosion of seawater can easily cause vortex-induced vibrations in suspended submarine cables, leading to wear and mechanical fatigue, which seriously threatens the safe operation of submarine cables.

[0005] However, the inventors realized that at present, the vibration of submarine cables can be monitored using distributed fiber optic sensing technology, and simulation results can be obtained by combining finite element simulation analysis of scaled models and extremely simplified models. However, due to the relatively simple finite element simulation model, the accuracy of the mechanism and state characteristics of the vortex-induced vibration obtained is low.

[0006] Summary of the Invention

[0007] According to various embodiments disclosed in the present application, a vortex-induced vibration simulation method, apparatus, computer equipment, computer-readable storage medium, and computer program product are provided.

[0008] A vortex-induced vibration simulation method includes:

[0009] Determining a three-dimensional finite element model based on physical parameters and dimensional 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;

[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] Based on the 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, the vortex-induced vibration characteristics of the submarine cable are obtained; wherein the coupling module is used to connect the fluid module and the transient structure module.

[0012] A vortex-induced vibration simulation device comprises:

[0013] A model determination module is used to determine a three-dimensional finite element model based on physical parameters and dimensional 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 to 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

[0015] A simulation module is used 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 used to connect the fluid module and the transient structure module.

[0016] A computer device includes a memory and one or more processors, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processors, the one or more processors execute the steps of the above method.

[0017] One or more computer-readable storage media storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of the above method.

[0018] A computer program product includes a computer program, which implements the steps of the above method when executed by a processor.

[0019] The above-mentioned 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 the physical parameters and dimensional parameters of the submarine cable and the physical parameters of seawater through the following technical means; the three-dimensional finite element model includes a target fluid domain and a target solid domain; in the fluid module corresponding to the target fluid domain, the 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, the second physical field boundary condition corresponding to the target solid domain is configured; based on the 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, the vortex-induced vibration characteristics of the submarine cable are obtained; wherein, the coupling module is used to connect the fluid module and the transient structure module.

[0020] It can be seen that based on the physical parameters and dimensional parameters of the submarine cable, as well as the physical parameters of seawater, a three-dimensional finite element model with the same actual size as the submarine cable can be obtained; and based on the target fluid domain and 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, 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 seawater, thereby achieving the effect of simulating the vortex-induced vibration characteristics of the submarine cable with high accuracy.

[0021] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] FIG1 is a diagram illustrating an application scenario of a vortex-induced vibration simulation method according to one or more embodiments;

[0024] FIG2 is a schematic flow chart of a vortex-induced vibration simulation method according to one or more embodiments;

[0025] FIG3 is a schematic flow diagram of steps for determining a three-dimensional finite element model according to one or more embodiments;

[0026] FIG4 is a flow chart of the steps of dividing a model according to one or more embodiments;

[0027] FIG5 is a schematic diagram of a process for configuring physical field boundary conditions according to one or more embodiments;

[0028] FIG6 is a schematic flow chart of steps for determining vortex-induced vibration characteristics according to one or more embodiments;

[0029] FIG7 is a schematic flow chart of steps for determining a curve corresponding to a vortex-induced vibration characteristic according to one or more embodiments;

[0030] FIG8 is a schematic flow chart of a vortex-induced vibration simulation method according to another embodiment;

[0031] FIG9 is a schematic structural diagram of a cross-section of a submarine cable model structure according to one or more embodiments;

[0032] FIG10 is a schematic diagram of the structure of mesh division of the target fluid domain and the target solid domain according to one or more embodiments;

[0033] FIG11 is a schematic structural diagram of mesh division of a target fluid domain and a target solid domain in another embodiment;

[0034] FIG12 is a schematic diagram of a structure of meshing of a target solid domain according to one or more embodiments;

[0035] FIG13 is a schematic diagram of a time-domain curve of a lateral amplitude according to one or more embodiments;

[0036] FIG14 is a schematic diagram of a frequency distribution curve according to one or more embodiments;

[0037] FIG15 is a block diagram of a vortex-induced vibration simulation device according to one or more embodiments;

[0038] FIG16 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 this application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0040] The vortex-induced vibration simulation method provided in the present application can be applied to the application environment as shown in Figure 1. Among them, the terminal 102 communicates with the server 104 through the network, and the terminal 102 can upload the physical parameters of the seawater obtained by monitoring to the server. The data storage system can store the data that the server 104 needs to process, such as the physical parameters and dimensional parameters of submarine cables of different models. The data storage system can be integrated on the server 104, or it can be placed on the cloud or other network servers. Among them, 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 with an independent server or a server cluster consisting of multiple servers.

[0041] In one embodiment, as shown in FIG2 , a vortex-induced vibration simulation method is provided, which is described by taking the method applied to the server in FIG1 as an example, and includes the following steps:

[0042] Step S202 determines a three-dimensional finite element model based on the physical and dimensional parameters of the submarine cable and the physical parameters of the seawater. A finite element model is a model created using finite element analysis. It is a set of elements connected only at nodes, transmitting forces only at 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 derived by three-dimensionally modeling 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] In other words, the target fluid domain in the 3D finite element model can be modeled based on the physical parameters of seawater, and the target solid domain in the 3D finite element model can be modeled based on the physical and dimensional parameters of the submarine cable. Submarine cables can include a variety of components, each with different dimensional and physical parameters. For example, each component can include a copper conductor, insulator, optical fiber, steel sheath, filler layer, steel wire armor layer, etc. Physical parameters can include density, Poisson's ratio, elastic modulus, dynamic viscosity, and other parameters. The physical parameter of seawater can be density. The dimensional parameters of the submarine cable can include thickness, outer diameter, and other parameters.

[0044] Specifically, the server can obtain the physical parameters and dimensional parameters corresponding to the specified model of submarine cable from the database, and based on the physical parameters and dimensional parameters, establish a three-dimensional finite element model of the specified model of submarine cable, and use it as the 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, and use it as the target fluid domain. The server can determine the model corresponding to the target solid domain and the model corresponding to the target fluid domain. Based on this, 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 rectangular parallelepiped with the same length as the submarine cable, which wraps the submarine cable, and the submarine cable is the target solid domain.

[0045] Step S204, in the fluid module corresponding to the target fluid domain, configure the first physical field boundary condition corresponding to the target fluid domain, and in the transient structure module corresponding to the target solid domain, configure the second physical field boundary condition corresponding to the target solid domain. The first physical field boundary condition is added by the server in the fluid module when simulating vortex-induced vibration, and is used to limit the first physical field boundary condition of the target fluid domain; the second physical field boundary condition is added in the transient structure module, and is used to limit the second physical field boundary condition of 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 submarine cables in a 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 over time. Specifically, after establishing a 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 phenomenon 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 motion direction, temperature, etc. of the target solid domain configured in the transient structure module corresponding to the target solid domain; the first physical field boundary condition can be the flow rate, temperature, etc. of the target fluid domain configured in the fluid module corresponding to the target fluid domain.

[0047] In one example, for different seawater environments and submarine cables, the server can configure the first physical field boundary condition and the second physical boundary condition corresponding to the seawater environment and the submarine cable to simulate different seawater environments and submarine cables. Among them, vortex-induced vibration is a wind-induced vibration phenomenon that occurs in long-span bridges under low wind speeds. From the perspective of fluid, any non-streamlined object, at a certain constant flow rate, will alternately generate vortices on both sides of the object that detach from the surface of the structure. Correspondingly, submarine cables are similar to long-span bridges and can also be regarded as bridges in the sea. Water-induced vibrations occur under the action of seawater. Therefore, vortex-induced vibrations can also be generated between submarine cables and seawater.

[0048] Step S206: Based on the target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and simulation using the fluid module, the transient structure module, and the coupling module, the 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, and the coupling module is used for data exchange between the fluid module and the transient structure module during the simulation process. Specifically, the coupling module can enable the fluid module and the transient structure module to fully exchange real-time simulation data during the simulation process, and continuously change the simulation results output by the fluid module and the transient structure module based on the interactive simulation data, thereby obtaining 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, and the control equation can be divided into the control equation of the fluid module and the 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, 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 equations of transient dynamics, thereby determining the vortex-induced vibration characteristics of the submarine cable.

[0050] Based on this, the process of the server simulating vortex-induced vibration is to input the physical parameters and material parameters of the target fluid domain into the fluid module, and input 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. At the same time, the server simulates the transient structure module based on the target simulation control strategy and the second physical field boundary condition. Moreover, 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. Based on multiple interactions between the real-time simulation data of the fluid module and the real-time simulation data of the transient structure module, the vortex-induced vibration characteristics of the submarine cable output by the transient structure module are obtained. 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, etc. of the fluid and structure that change with time, and realize the simulation of vortex-induced vibration.

[0051] Based on the above-mentioned vortex-induced vibration simulation method, it can be seen that based on the physical parameters and dimensional parameters of the submarine cable, as well as the physical parameters of seawater, a three-dimensional finite element model with the same actual size as the submarine cable can be obtained; and based on the target fluid domain and 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, 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 seawater, thereby achieving the effect of simulating the vortex-induced vibration characteristics of the submarine cable with high accuracy.

[0052] In the above-mentioned vortex-induced vibration simulation method, it can be seen that based on the physical parameters and dimensional parameters of the submarine cable, as well as the physical parameters of seawater, a three-dimensional finite element model with the same actual size as the submarine cable can be obtained; and based on the target fluid domain and 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, 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 seawater, thereby achieving the effect of simulating the vortex-induced vibration characteristics of the submarine cable with high accuracy.

[0053] In one embodiment, as shown in FIG3 , the step of determining a three-dimensional finite element model based on the physical parameters and dimensional parameters of the submarine cable and the physical parameters of seawater includes: Step S302 , determining a target solid domain corresponding to the submarine cable based on the physical parameters and dimensional parameters of the submarine cable; Step S304 , determining a target fluid domain corresponding to the seawater based on the physical parameters of the seawater, and determining the target solid domain and the target fluid domain as a three-dimensional finite element model.

[0054] The 3D finite element model includes a target fluid domain and a target solid domain. The 3D finite element model is derived from the submarine cable and seawater through 3D modeling. The target fluid domain corresponds to the seawater, and the target solid domain corresponds to the submarine cable. The target fluid domain in the 3D finite element model can be modeled based on the physical parameters of the seawater, while the target solid domain in the 3D finite element model can be modeled based on the physical parameters and dimensional parameters of the submarine cable.

[0055] In one example, a submarine cable includes multiple components, each with different dimensional parameters and physical parameters. For example, each component may include a copper conductor, insulator, optical fiber, steel sheath, filler layer, or steel wire armor layer. Physical parameters may include density, Poisson's ratio, elastic modulus, and dynamic viscosity. The physical parameters of seawater may include density. Dimensional parameters of a submarine cable may include thickness and outer diameter. Therefore, the server can determine the model corresponding to the target solid domain based on the dimensional parameters and physical parameters of each submarine cable component. The server can also determine the model corresponding to the target fluid domain based on the physical parameters of the seawater, thereby obtaining the entire 3D finite element model.

[0056] Specifically, the server can obtain the physical parameters and dimensional parameters corresponding to the specified model of submarine cable from the database, and establish a three-dimensional finite element model of the specified model of submarine cable based on the physical parameters and dimensional parameters, and use the three-dimensional finite element model of the specified model of submarine cable 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 use 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, so that a three-dimensional finite element model of the submarine cable with real size and material can be established.

[0058] In one of the embodiments, as shown in FIG4 , before configuring the first physical field boundary condition corresponding to the target fluid domain in the fluid module corresponding to 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, dividing the initial fluid domain to determine the target fluid domain containing multiple fluid grids. Step S404, based on the transient structure module corresponding to the initial solid domain, dividing the initial solid domain to determine the target solid domain containing multiple solid grids. Among them, the fluid grid is the grid obtained after the target fluid domain is divided by the fluid module, and the solid grid is the grid obtained after the target solid domain is divided by the transient structure module. There is a grid division function in the fluid module, and it is used to divide the initial fluid domain to obtain a target fluid domain after the division is completed; there is also a grid division function in the transient structure module, and it is used to divide the initial solid domain to obtain a target solid domain after the division is completed.

[0059] Specifically, before performing finite element analysis on a three-dimensional finite element model, the server can mesh the three-dimensional finite element model to obtain a three-dimensional finite element model with multiple meshes. There is a correlation between the number of meshes and the accuracy of the calculation results. As the number of meshes increases, the calculation accuracy will increase. Based on the partitioning function of the fluid module, the server can mesh the initial fluid domain in the three-dimensional finite element model to obtain a target fluid domain containing multiple fluid meshes; based on the partitioning function of the transient structure module, the server can mesh the initial solid domain in the three-dimensional finite element model to obtain a target fluid domain containing multiple solid meshes.

[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 domain and an outer domain, wherein the inner domain has a large number of grids and a high density, and the outer domain has a small number of grids and a low density; dividing the target fluid domain into inner and outer domains can ensure simulation accuracy while saving computing resources. In addition, the fluid-solid coupling boundary can also be divided into boundary layer grids, wherein the fluid-solid coupling boundary is the location where the target fluid domain and the target solid domain intersect. Optionally, step S402 and step S404 are two independent steps that can be implemented simultaneously. Therefore, the execution order of step S402 and step S404 can be adjusted as needed.

[0061] In this embodiment, the initial fluid domain and the initial solid domain are meshed by the fluid module and the transient structure module, respectively, to obtain the target fluid domain and the target solid domain. The meshing can improve the simulation efficiency and quality.

[0062] In one embodiment, the specific implementation process of the step "dividing the initial solid domain based on the transient structure module corresponding to the initial solid domain and determining the target solid domain containing multiple solid grids" includes: 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, and obtaining a target solid domain containing multiple solid grids. Among them, since the submarine cable is composed of multiple component structures, the materials of each structure are different. 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 using the grid division method corresponding to each component structure.

[0063] Specifically, the meshing methods corresponding to each component structure may include sweeping, mapping, and patch conformal methods. The server uses the sweeping method to mesh the torsional structures, such as the copper conductor, insulation layer, optical fiber, and steel sheath, corresponding to the target solid domain. It uses the mapping method to mesh the steel wire armor layer and outer layer corresponding to the target solid domain. It uses the patch conformal method to mesh the filling layer corresponding to the target solid domain, resulting in a target solid domain containing multiple solid meshes.

[0064] In this embodiment, the quality of grid division can be improved by using different division methods to divide the submarine cable into grids according to the various structures of the submarine cable.

[0065] In one embodiment, as shown in FIG5 , the step of 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, specifically implements the process of:

[0066] Step S502, in the fluid module corresponding to the target fluid domain, determine the structural parameters and motion parameters. Among them, the structural parameters include the fluid inlet, fluid outlet and fluid wall, and the motion parameters include fluid velocity, fluid gravity and fluid buoyancy. The fluid inlet is the structure for fluid inflow, the fluid outlet is the structure for fluid outflow, 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 may also include the fluid velocity of the fluid configured by the server during flow; in other examples, the first physical field boundary condition may also include the gravity and buoyancy of the fluid itself. Specifically, the server determines the fluid inlet, fluid outlet and fluid wall as well as the fluid velocity, fluid gravity and fluid buoyancy in the fluid module corresponding to the target fluid domain. It should be understood that in addition to the above-mentioned fluid inlet, fluid outlet and fluid wall, the structural parameters may also have other implementation methods; the motion parameters include fluid velocity, fluid gravity and fluid buoyancy, and may also have other implementation methods, which are not specifically limited here.

[0067] Step S504, in the transient structure module corresponding to the target solid domain, determine the gravity parameters and configure the fixed structure of the submarine cable. The gravity parameter may be the gravity of the target solid domain, and the fixed structure may include fixed substructures corresponding to the two ends of the submarine cable, and the fixed substructure may be a fixed support structure; the fixed substructure is used to simulate the suspended state of the submarine cable in seawater. The fixed structure may also include multiple fixed substructures, which can fix the submarine cable according to user needs. Specifically, in the transient structure module corresponding to the target solid domain, the server determines the gravity parameters corresponding to the target solid domain, such as the mass of the submarine cable, and configures the fixed structure of the submarine cable, so as to fix the submarine cable in the seawater. Optionally, as an embodiment, the server can set a fluid-solid coupling interface to transmit the interaction information between the fluid module and the transient structure module, and use the fluid-solid coupling interface as a physical field boundary condition.

[0068] In this embodiment, the physical field boundary conditions are configured through the fluid module and the transient structure module, and the meshes are divided into different grid division methods according to the various component structures, thereby achieving the effect of improving the quality of the grid division.

[0069] In one embodiment, as shown in FIG6 , the specific implementation process of the step “deriving vortex-induced vibration characteristics of the submarine cable based on the 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” 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 exchange data through the coupling module to obtain simulation results output by the transient structure module. In step S604, based on the simulation results output by the transient structure module, the vortex-induced vibration characteristics of the submarine cable are determined.

[0071] The target simulation control strategy can be a control equation, which can be divided into a control equation for the fluid module and a control equation for the transient structure module. After configuring the first and second physical field boundary conditions, energy conversion can be performed on the fluid module and the transient structure module based on the target simulation control strategy. The control equation corresponding to the target simulation control strategy can be divided into a control equation for the fluid module and a control equation for the transient structure module.

[0072] Specifically, when the server is simulating, the fluid module and the transient structure module can be simulated at the same time, and the simulation data of the fluid module and the transient structure module can be exchanged 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 simulation data output by the fluid module to obtain the 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 simulation data output by the transient structure module. After multiple data interactions between the fluid module and the transient structure module, the simulation results after the interaction between the fluid module and the transient structure module can be obtained. Based on this, the server can obtain the vortex-induced vibration characteristics of the submarine cable. In one example, the vortex-induced vibration characteristics of the submarine cable can be obtained from the simulation results output by the transient structure module.

[0073] In this embodiment, the fluid module and the transient structure module are associated by the coupling module, so that the data in the fluid module and the transient structure module can be fully interacted during simulation, thereby achieving the effect of improving the accuracy of vortex-induced vibration simulation.

[0074] In one embodiment, as shown in FIG7 , after the step of obtaining the vortex-induced vibration characteristics of the submarine cable based on the target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and the simulation through the fluid module, the transient structure module, and the coupling module, the specific implementation process of the vortex-induced vibration simulation method further includes:

[0075] Step S702: Process the vortex-induced vibration characteristics of the submarine cable based on a curve generation algorithm to obtain a time-domain curve of the transverse amplitude corresponding to the vortex-induced vibration characteristics of the submarine cable. Step S704: Perform a Fourier transform on the time-domain curve of the transverse amplitude 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 may be a statistical algorithm based on the transverse amplitude of the vortex-induced vibration per unit time, and the curve generation algorithm is used to generate a time-domain curve of the transverse amplitude corresponding to the vortex-induced vibration characteristics of the submarine cable.

[0076] Specifically, when the coupling module is simulating, the server will set the coupling solver, set the total simulation time and simulation step, so that the lateral amplitude of the vortex-induced vibration per unit time can be statistically analyzed through the total simulation time and simulation step, and the lateral amplitude time domain curve shown in Figure 13 can be obtained. In one of the examples, the simulation step and total simulation time are set for the coupling solver. In order to ensure better convergence of the fluid-solid coupling simulation iterative process and to ensure simulation accuracy, the simulation step is set to a smaller value. The server can also convert the lateral amplitude time domain curve into a frequency distribution curve as shown in Figure 14 through the Fourier transform algorithm.

[0077] In this embodiment, the lateral amplitude time domain curve and 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 FIG8 , the specific execution process of the above-mentioned vortex-induced vibration simulation is described in detail below in conjunction with a specific embodiment, including the following steps:

[0079] Step 1: Import the geometric structure and dimensional parameters of the submarine cable, and input the physical parameters of the materials of each structural layer of the submarine cable and seawater. The dimensional parameters of each layer of the submarine cable are shown in Table 1, and the physical parameters of each layer of the submarine cable are shown in Table 2.

[0080] Table 1

[0081] Table 2

[0082] Step 2: Establish a three-dimensional finite element simulation model of vortex-induced vibration of a submarine cable of actual size as shown in Figures 9 and 10. The cross-section of the submarine cable model structure is shown in Figure 9: it consists of a copper conductor 1, an insulating layer 2, a filling layer 3, an optical fiber 4, a steel sheath 5, a steel wire armor layer 6, and an outer layer 7. As shown in Figure 10, the target fluid domain is a rectangular parallelepiped with the same length as the submarine cable.

[0083] Step 3: Based on the 3D finite element simulation model established in Step 2, meshing of the target fluid domain and target solid domain is performed in the fluid module and transient structure module, respectively. A mapping method is used to perform structured meshing on the target fluid domain. The target fluid domain is divided into an inner flow domain 8 and an outer flow domain 9. The inner flow domain mesh is refined to save computing resources while ensuring simulation accuracy. A boundary layer mesh is also created for the fluid-structure interaction boundary. Different meshing methods are used for each structure of the submarine cable model. The torsional structures, such as the copper conductor 1, insulation layer 2, optical fiber 4, and steel sheath 5, are meshed using a sweeping method. The steel wire armor layer 6 and outer layer 7 are meshed using a mapping method. Finally, the infill layer is meshed using a patch conformal method. The final meshing results are shown in Figures 10, 11, and 12.

[0084] Step 4: Set the physical field boundary conditions for the three-dimensional finite element simulation model in the fluid module and transient structure module respectively. As shown in Figure 11, set the inlet 10, outlet 11 and wall 12 for the fluid domain, set the water flow velocity, and apply gravity and buoyancy to the seawater; apply gravity to the submarine cable model, and set fixed supports at both ends to simulate the suspended state of the actual submarine cable during vortex-induced vibration; finally, set the fluid-solid coupling interface to transmit the interactive information between the fluid module and the transient structure module.

[0085] Step 5: Establish the following control equation in the fluid module:

[0086] Where k represents turbulent kinetic energy, ω represents dissipation ratio; G k represents the turbulent kinetic energy due to the mean velocity gradient; G ω represents the generation of dissipation ratio; Γ k and Γ ω represents the effective diffusion rate of k and ω; Y k and Y ω Represents the dissipation of turbulence and the dissipation caused by turbulence.

[0087] The following control equations are established in the transient structural module:

[0088] Where 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; and a is the acceleration.

[0089] Step 6: Set the required output results in the fluid module and transient structure module, such as the lateral amplitude of vortex-induced vibration; and set the coupled solver, setting the total simulation time to 5s and the simulation step to 0.0025s.

[0090] Step seven: perform coupling simulation on the coupling module, extract the simulation results and perform post-processing to obtain: the time domain curve of the lateral amplitude of the vortex-induced vibration of the submarine cable, the frequency distribution curve of the vortex-induced vibration of the submarine cable, etc., as shown in Figures 13 and 14.

[0091] It should be understood that, although the steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily to be performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0092] In one embodiment, as shown in FIG15 , 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 used to determine a three-dimensional finite element model based on the physical parameters and dimensional parameters of the submarine cable and the physical parameters of the seawater; the three-dimensional finite element model includes a target fluid domain and a target solid domain;

[0094] A 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 to 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 used to obtain the vortex-induced vibration characteristics of the submarine cable based on the target simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and the simulation through the fluid module, the transient structure module and the coupling module; wherein the coupling module is used to connect the fluid module and the transient structure module.

[0096] In one embodiment, the model determination module 1501 is specifically used to: determine the target solid domain corresponding to the submarine cable based on the physical parameters and dimensional parameters of the submarine cable; and determine the target fluid domain corresponding to the seawater based on the physical parameters of the seawater, and determine the target solid domain and the target fluid domain as a three-dimensional finite element model.

[0097] In one embodiment, the vortex-induced vibration simulation device also includes a division module, which is specifically used to: divide the initial fluid domain based on the fluid module corresponding to the initial fluid domain, and determine the target fluid domain containing multiple fluid grids; and divide the initial solid domain based on the transient structure module corresponding to the initial solid domain, and determine the target solid domain containing multiple solid grids.

[0098] In one embodiment, the division module is further configured to divide 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 a target solid domain containing multiple solid grids.

[0099] In one embodiment, the configuration module 1502 is specifically used to: determine structural parameters and motion parameters in the fluid module corresponding to the target fluid domain, the structural parameters including the fluid inlet, fluid outlet and fluid wall, and the motion parameters including the fluid velocity, fluid gravity and fluid buoyancy; and determine 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 embodiment, the simulation module 1503 is specifically used to: based on the target simulation control strategy, the first physical field boundary condition, and the second physical field boundary condition, enable the fluid module and the transient structure module to exchange data through the coupling module to obtain the simulation results output by the transient structure module; and determine the vortex-induced vibration characteristics of the submarine cable based on the simulation results output by the transient structure module.

[0101] In one embodiment, the vortex-induced vibration simulation device also includes a curve generation module, which is specifically used to: process the vortex-induced vibration characteristics of the submarine cable based on the curve generation algorithm to obtain a lateral amplitude time-domain curve corresponding to the vortex-induced vibration characteristics of the submarine cable; and perform Fourier transform on the lateral amplitude time-domain curve based on the Fourier transform algorithm to obtain a frequency distribution curve corresponding to the vortex-induced vibration characteristics of the submarine cable.

[0102] For the specific definition of the vortex-induced vibration simulation device, please refer to the definition of the vortex-induced vibration simulation method above, which will not be repeated here. The various modules in the above-mentioned vortex-induced vibration simulation device can be implemented in whole or in part by software, hardware, and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0103] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in FIG16 . The computer device includes a processor, a memory, a network interface, and a database connected via a system bus. The processor of the computer device is used 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 the operation of the operating system and computer-readable instructions in the non-volatile storage medium. The database of the computer device is used to store the physical parameters and dimensional parameters of the submarine cable, the physical parameters of seawater, the vortex-induced vibration characteristics of the submarine cable, the simulation control strategy, and the physical field boundary condition data. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer-readable instructions are executed by the processor, a vortex-induced vibration simulation method is implemented.

[0104] Those skilled in the art will understand that the structure shown in Figure 16 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0105] A computer device includes a memory and one or more processors. The memory stores computer-readable instructions. When the computer-readable instructions are executed by the processors, the one or more processors execute the steps of the above method.

[0106] One or more computer-readable storage media storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to perform the steps of the above method.

[0107] The computer-readable storage medium may be non-volatile or volatile.

[0108] A computer program product includes a computer program, which implements the steps of the above method when executed by a processor.

[0109] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through computer-readable instructions. The computer-readable instructions can be stored in a computer-readable storage medium. When executed, the computer-readable instructions can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this 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. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), 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).

[0110] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A vortex-induced vibration simulation method, comprising: 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 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; and Based on the 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, the vortex-induced vibration characteristics of the submarine cable are obtained; wherein the coupling module is used to connect the fluid module and the transient structure module.

2. The method according to claim 1, wherein: The three-dimensional finite element model is determined based on the physical parameters and size parameters of the submarine cable and the physical parameters of the seawater, including: Determining a target solid domain corresponding to the submarine cable according to the physical parameters and size parameters of the submarine cable; and According to the physical parameters of the seawater, a target fluid domain corresponding to the seawater is determined, and the target solid domain and the target fluid domain are determined as the three-dimensional finite element model.

3. The method according to claim 1, wherein: Before configuring 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 includes: Based on the fluid module corresponding to the initial fluid domain, the initial fluid domain is divided to determine a target fluid domain including a plurality of fluid grids; and Based on the transient structure module corresponding to the initial solid domain, the initial solid domain is divided to determine a target solid domain including a plurality of solid grids.

4. The method according to claim 3, wherein: The method of dividing the initial solid domain based on the transient structure module corresponding to the initial solid domain to determine a target solid domain containing a plurality of solid grids includes: According to the mesh division method corresponding to each component structure of the submarine cable, each component structure corresponding to the initial solid domain is divided respectively to obtain a target solid domain containing multiple solid grids.

5. The method according to claim 1, wherein: The step of 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, includes: In a fluid module corresponding to the target fluid domain, determining structural parameters and motion parameters, the structural 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 In the transient structure module corresponding to the target solid domain, gravity parameters are determined, and the fixed structure of the submarine cable is configured.

6. The method according to claim 1, wherein: The target-based simulation control strategy, the first physical field boundary condition, the second physical field boundary condition, and the simulation through the fluid module, the transient structure module and the coupling module to obtain the vortex-induced vibration characteristics of the submarine cable include: 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 perform data exchange through a coupling module to obtain a simulation result output by the transient structure module; and Based on the simulation results output by the transient structure module, the vortex-induced vibration characteristics of the submarine cable are determined.

7. The method according to claim 1, wherein: After obtaining the vortex-induced vibration characteristics of the submarine cable based on the 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, the method further includes: Based on a curve generation algorithm, the vortex-induced vibration characteristics of the submarine cable are processed to obtain a lateral amplitude time-domain curve corresponding to the vortex-induced vibration characteristics of the submarine cable; and Based on the Fourier transform algorithm, the lateral amplitude time domain curve is Fourier transformed to obtain a frequency distribution curve corresponding to the vortex-induced vibration characteristics of the submarine cable.

8. A vortex-induced vibration simulation device, comprising: A model determination module, used for determining 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; 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 to 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 A simulation module is used 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 used to connect the fluid module and the transient structure module.

9. A computer device comprising a memory and one or more processors, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the one or more processors execute the steps of the method according to any one of claims 1 to 7.

10. One or more computer-readable storage media storing computer-readable instructions, wherein when the computer-readable instructions are executed by one or more processors, the one or more processors execute the steps of the method according to any one of claims 1 to 7.

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