Fluent-based static pressure rotary table oil flow simulation method

Abstract

The invention discloses a Fluent-based static pressure rotary table oil flow simulation method. The method comprises the following steps: constructing a fluid domain model of a static pressure rotary table and carrying out gridding processing to obtain a fluid domain grid model; setting an oil analysis mode of the fluid domain grid model as steady-state analysis through a Fluent module, and setting a corresponding equation solver; setting an oil flow model and configuring parameters based on the fluid type of the hydraulic oil; setting boundary condition parameters; setting spatial discretization method parameters of the equation solver through a speed-pressure coupling algorithm; the equation solver is initialized, and the centrifugal flow of the static pressure rotary table is calculated; a preset step number and a preset step length are selected to simulate the fluid motion state of the oil flow model so as to analyze the total oil flow, and the differential pressure flow is calculated through the total oil flow and the centrifugal flow. The method provided by the invention solves the problem that the static pressure rotary table is easy to generate non-differential pressure loss in a high-linear-speed rotating state.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrostatic turntables, and in particular, to a method for simulating the oil flow rate of a hydrostatic turntable based on Fluent. Background Art

[0002] Currently, when designing the specific oil circuit structure of a large hydrostatic turntable, it is necessary to simulate the fluid motion state of the oil circuit structure of the hydrostatic turntable in advance to obtain the flow rate and bearing capacity parameters of the oil circuit structure. When simulating the flow rate of the oil circuit structure of the existing hydrostatic turntable, it mainly simulates the differential pressure flow rate of the fluid to optimize the oil circuit structure of the hydrostatic turntable according to the obtained differential pressure flow rate. However, when the hydrostatic turntable rotates, due to the relatively large diameter of the turntable, a certain centrifugal force will be generated, resulting in centrifugal flow. If the centrifugal flow is too large, a large non-differential pressure loss will be generated, making the fluid generating the differential pressure flow rate unable to meet the design requirements, resulting in dry burning of the hydrostatic turntable. Summary of the Invention

[0003] The main purpose of the present invention is to provide a method for simulating the oil flow rate of a hydrostatic turntable based on Fluent, so as to at least solve the problem that the centrifugal flow caused by the centrifugal force of the fluid is not considered during the design of the hydrostatic turntable, resulting in a large non-differential pressure loss during the rotation of the hydrostatic turntable and dry burning of the hydrostatic turntable.

[0004] According to one aspect of the present invention, a method for simulating the oil flow rate of a hydrostatic turntable based on Fluent is provided, including:

[0005] Step S1: Construct a fluid domain model corresponding to the hydrostatic turntable according to the structural characteristics and mating characteristics of the hydrostatic turntable;

[0006] Step S2: Perform meshing on the fluid domain model to obtain a fluid domain mesh model;

[0007] Step S3: Import the fluid domain mesh model into the Fluent module, and set the oil analysis mode of the fluid domain mesh model as steady-state analysis through the Fluent module, and set the corresponding equation solver;

[0008] Step S4: Set an oil flow model based on the fluid type of the hydraulic oil corresponding to the hydrostatic turntable and configure the parameters of the oil flow model;

[0009] Step S5: Set boundary condition parameters based on the actual boundary conditions of the fluid domain;

[0010] Step S6: Set the parameters of the spatial discretization method corresponding to the equation solver through the velocity-pressure coupling algorithm;

[0011] Step S7: Initialize the equation solver and calculate the centrifugal flow rate of the hydrostatic turntable through the equation solver.

[0012] Step S8: Select a preset number of steps and a preset step size to simulate the fluid motion state of the oil flow model, analyze the total oil flow rate of the hydrostatic turntable based on the characteristics of the fluid motion state, and calculate the differential pressure flow rate of the hydrostatic turntable through the total oil flow rate and the centrifugal flow rate.

[0013] Further, the step S1 includes:

[0014] Step S11: Obtain the three-dimensional structure model of the hydrostatic turntable with symmetry characteristics and flow characteristics.

[0015] Step S12: Define the oil circuit structure characteristics corresponding to the hydrostatic turntable according to the three-dimensional structure model.

[0016] Step S13: Set the three-dimensional coordinate system of the fluid domain corresponding to the hydrostatic turntable according to the oil circuit structure characteristics.

[0017] Step S14: Combine the oil circuit structure characteristics and the three-dimensional coordinate system to construct the fluid domain model of the hydrostatic turntable through spaceclaim software.

[0018] Further, the step S2 includes:

[0019] Step S21: Obtain the structural characteristics and fluid characteristics of the fluid domain of the hydraulic oil of the hydrostatic turntable.

[0020] Step S22: Select the mesh type of the fluid domain model according to the structural characteristics and the fluid characteristics.

[0021] Step S23: Set the mesh parameters according to the fluid domain model.

[0022] Step S24: Perform mesh division on the fluid domain model through mesh generation software based on the mesh type and the mesh parameters to obtain the fluid domain mesh model.

[0023] Further, the step S3 includes:

[0024] Step S31: Import the fluid domain mesh model into the Fluent module, and set the oil analysis mode of the fluid domain mesh model as the steady-state analysis mode through the General unit of the Fluent module.

[0025] Step S32: Set the parameters of the equation solver according to the fluid characteristics and flow characteristics of the hydraulic oil. The parameters of the equation solver include the viscous heating term and gravity.

[0026] Further, the step S4 includes:

[0027] Step S41: Set the fluid type of the hydraulic oil of the static pressure turntable to laminar flow through the Models unit of the Fluent module;

[0028] Step S42: Turn on the multiphase flow switch of the Models unit and select the VOF multiphase flow mode in the homogeneous model as the oil flow model;

[0029] Step S43: Set the oil flow model as a two-phase flow model and set the model parameters corresponding to the two-phase flow model.

[0030] Further, the model parameters include oil viscosity, volume fraction, primary phase, secondary phase, and surface tension coefficient.

[0031] Further, the step S5 includes:

[0032] Step S51: Obtain the actual boundary parameters of the fluid domain;

[0033] Step S52: Set the boundary condition parameters of the fluid domain in the Fluent module according to the actual boundary parameters. The boundary condition parameters include inlet pressure, outlet pressure, flow rate parameters, inlet thermal boundary parameters, outlet thermal boundary parameters, and wall thermal boundary parameters. The outlet pressure is the gauge pressure.

[0034] Further, the step S6 includes:

[0035] Step S61: Select the SIMPLE algorithm as the velocity-pressure coupling algorithm through the Fluent module;

[0036] Step S62: Determine the gradient, pressure, and momentum of the spatial discretization method corresponding to the equation solver based on the SIMPLE algorithm;

[0037] Step S63: Set the relaxation factor for controlling the convergence degree of the SIMPLE algorithm.

[0038] Further, the S7 includes:

[0039] Step S71: Set the flow field parameters corresponding to the equation solver. The flow field parameters include velocity, pressure, and volume fraction;

[0040] Step S72: Set the residual accuracy for judging whether the equation solver converges under the relaxation factor;

[0041] Step S73: Calculate the centrifugal flow rate of the static pressure turntable through the equation solver in combination with the flow field parameters;

[0042] Step S74: Determine whether the equation solver converges based on the residual accuracy. If not, update the flow field parameters and return to execute Step S73.

[0043] Further, the said Step S8 includes:

[0044] Step S81: Set the time step according to the designed operating speed and flow characteristics of the hydrostatic turntable, and set the number of time steps in combination with the operating cycle of the hydrostatic turntable and the said time step;

[0045] Step S82: Set the simulation animation parameters corresponding to the fluid motion state in the calculation unit of the Fluent module, and simulate the fluid motion state based on the said simulation animation parameters in combination with the time step, the number of time steps and the flow field parameters to obtain the motion state simulation animation;

[0046] Step S83: Analyze the total oil flow rate of the hydrostatic turntable in combination with the motion state simulation animation, and calculate the differential pressure flow rate of the hydrostatic turntable based on the difference between the said total oil flow rate and the centrifugal flow rate.

[0047] In the present invention, through the simulation of the centrifugal flow generated by the rotation of the hydrostatic turntable, the analysis of various flow types of the oil fluid in the hydrostatic turntable is realized, and the accurate distribution of the oil fluid flow under different working conditions can be obtained, including the numerical values and variation trends of the centrifugal flow and the differential pressure flow. The centrifugal flow is accurately calculated, and the differential pressure flow is obtained by comparing with the total oil fluid flow. When the centrifugal flow is too large, it will cause an increase in non-differential pressure losses, making the differential pressure flow required to maintain the normal operation of the hydrostatic turntable unable to meet the design requirements, and then leading to dry burning of the turntable. Through precise simulation analysis, this application can early warn of the occurrence of such a risk situation based on the centrifugal flow obtained from the simulation, and adjust the structural parameters of the turntable according to the simulation results during the design stage, such as optimizing the shape, size or position of the oil cavity, so as to change the distribution of the centrifugal force, thereby controlling the centrifugal flow within a reasonable range and improving the operation reliability of the hydrostatic turntable. Based on the flow data obtained from the simulation, the layout of the oil cavity and the oil circuit is accurately adjusted according to the flow requirements and pressure distribution in different regions. For example, if the simulation finds that the centrifugal flow of a certain oil cavity is too large and the differential pressure flow is insufficient under specific working conditions, the inlet and outlet positions, shapes or sizes of the oil cavity can be changed accordingly to make the flow of the oil fluid in the cavity more reasonable, balance the relationship between the centrifugal flow and the differential pressure flow, and improve the utilization efficiency of the oil fluid and the load-bearing capacity of the hydrostatic turntable. Through the simulation analysis of the flow under different parameter combinations, the optimal operating parameters can be quickly determined. For example, by simulating the change of the oil fluid flow at different oil temperatures, the optimal oil temperature range that can not only ensure the appropriate oil fluid viscosity to maintain the normal differential pressure flow but also control the centrifugal flow can be found; or by adjusting the rotational speed parameter of the turntable and combining the flow simulation results, the rotational speed value that minimizes the impact of the centrifugal flow on the system under the premise of meeting the working requirements can be determined. This optimized design process of the flow simulation of the hydrostatic turntable considering the centrifugal flow can significantly shorten the product R & D cycle, improve the design quality, reduce the R & D cost, and enhance the competitiveness of the product in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0049] Figure 1 is a schematic flow chart of the method for simulating the oil fluid flow of the hydrostatic turntable based on Fluent disclosed in the embodiment of the present invention;

[0050] Figure 2 is a schematic temperature field diagram of the hydrostatic turntable when it is not rotating disclosed in the embodiment of the present invention;

[0051] Figure 3 is a schematic temperature field diagram of the hydrostatic turntable when it is rotating disclosed in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0055] See Figure 1 As shown, according to an embodiment of the present application, a method for simulating the oil flow of a hydrostatic turntable based on Fluent is provided, including:

[0056] Step S1: Construct a fluid domain model corresponding to the hydrostatic turntable according to the structural characteristics and mating characteristics of the hydrostatic turntable;

[0057] Further, step S1 includes:

[0058] Step S11: Obtain a three-dimensional structural model of the hydrostatic turntable with symmetric and flow characteristics;

[0059] Step S12: Define the oil circuit structure characteristics corresponding to the hydrostatic turntable according to the three-dimensional structural model;

[0060] Step S13: Set the three-dimensional coordinate system of the fluid domain corresponding to the hydrostatic turntable according to the oil circuit structure characteristics;

[0061] Step S14: Combine the oil circuit structure characteristics with the three-dimensional coordinate system to construct a fluid domain model of the hydrostatic turntable through spaceclaim software.

[0062] Specifically, obtain the three-dimensional structural model of the hydrostatic turntable through 3D modeling software, ensuring that the model accurately reflects the actual shape, dimensions of the turntable, and the mating relationship between components. Pay particular attention to the shape and dimensional accuracy of the oil cavities, and save the model in the.STEP format. Analyze the three-dimensional structural model to determine the oil circuit structural characteristics of the hydrostatic turntable, including information such as the inlet position of the oil, the outlet position, the connection channels between the oil cavities, and the approximate flow path of the oil inside the turntable, and make detailed records and annotations. According to the geometric shape of the hydrostatic turntable and the installation direction during actual operation, set the three-dimensional coordinate system of the corresponding fluid domain of the hydrostatic turntable, with the central axis of the turntable as the Z-axis, the turntable plane as the XY plane, and the origin located at the center of the turntable, ensuring that the setting of the coordinate system conforms to the habits and requirements of subsequent calculations and analyses. Import the above-defined oil circuit structural characteristics and three-dimensional coordinate system information into SpaceClaim software, and use the geometric modeling and editing functions of SpaceClaim software to precisely construct the fluid domain model of the hydrostatic turntable through Boolean operation, removing the solid part of the turntable and only retaining the space area where the oil can flow, while ensuring that the position of the rotation origin remains unchanged. Finally, save the fluid domain model in the.FluentMesh format for subsequent import into the Fluent module for mesh generation and analysis.

[0063] In the above embodiments, obtaining a three-dimensional structural model with symmetry and flow characteristics can accurately restore the actual physical form of the turntable, fully consider its symmetry, and improve the calculation efficiency and accuracy. Based on the oil circuit structural characteristics defined by the three-dimensional structural model, setting the three-dimensional coordinate system of the fluid domain according to the oil circuit characteristics provides a unified and standardized spatial reference for the entire simulation process, ensuring the accurate calculation of various parameters and the precise description of physical quantities. Using SpaceClaim software to construct the fluid domain model in combination with the oil circuit characteristics and the coordinate system, the constructed fluid domain model has a high degree of fit with the actual turntable. When subsequently importing it into software such as Fluent for mesh generation, boundary condition setting, and numerical solution, it can effectively reduce problems such as calculation errors and convergence difficulties caused by inaccurate models, thereby being able to more accurately simulate the oil flow state of the hydrostatic turntable under different working conditions and providing strong support for optimizing the turntable design and improving its performance and reliability.

[0064] Step S2: Perform meshing on the fluid domain model to obtain a fluid domain mesh model;

[0065] Furthermore, step S2 includes:

[0066] Step S21: Obtain the structural characteristics and fluid characteristics of the fluid domain of the hydraulic oil of the hydrostatic turntable;

[0067] Step S22: Select the mesh type of the fluid domain model according to the structural characteristics and fluid properties;

[0068] Step S23: Set the mesh parameters according to the fluid domain model;

[0069] Step S24: Based on the mesh type and mesh parameters, use a mesh generation software to perform mesh generation on the fluid domain model to obtain a fluid domain mesh model.

[0070] Specifically, according to the physical properties of the hydraulic oil of the hydrostatic turntable and the geometric shape of the fluid domain, obtain the structural characteristics (such as the dimensions in the oil film thickness direction, etc.) and fluid characteristics (such as Reynolds number, flow velocity range, etc.) of the fluid domain. Based on the above analysis of the structural characteristics and fluid properties, select the mesh type of the fluid domain model. For the hydrostatic turntable in this embodiment, considering its certain geometric regularity and requirements for calculation accuracy, a combination of structured mesh and unstructured mesh is adopted. In regions that have a greater impact on flow details, such as inside the oil cavity and in the oil film thickness direction, structured mesh is used to ensure the quality of the mesh and the accurate simulation of the boundary layer; in other relatively simple regions, such as the fluid domain outside the turntable and some transition regions, unstructured mesh is adopted to improve the efficiency and flexibility of mesh generation. According to the selected mesh type and the specific situation of the fluid domain model, set the mesh parameters, including mesh density, number of mesh layers, etc. Use facemeshing to perform mesh generation on the fluid domain model, and control the mesh size through the sizecontrol function. For the structured mesh part, set the number of layers in the oil film thickness direction to at least 3 - 5 layers, and the thickness of each layer is evenly divided according to the actual situation of the oil film thickness to ensure that the velocity and pressure changes in the oil film can be accurately captured; in other directions, set an appropriate mesh size growth rate according to the geometric dimensions and flow characteristics to control the number of meshes on the premise of ensuring calculation accuracy and avoid excessive consumption of computing resources. For the unstructured mesh part, set appropriate maximum and minimum mesh sizes, as well as mesh smoothness and orthogonality parameters to ensure the quality of the overall mesh and the stability of the calculation. After mesh generation is completed, perform a quality check on the generated fluid domain mesh model to ensure that the mesh quality indicators (such as aspect ratio, skewness, Jacobian determinant, etc.) meet the calculation requirements of the Fluent module. Generally, it is required that the aspect ratio of most meshes is less than 100 and the skewness is less than 45°. Finally, save the generated high-quality fluid domain mesh model in the.msh format for subsequent simulation calculations.

[0071] In the above embodiments, by selecting an appropriate mesh type according to the structural and fluid characteristics of the fluid domain of the hydraulic oil of the hydrostatic turntable, the mesh generation efficiency can be optimized while ensuring the calculation accuracy, and the waste of computing resources or inaccurate results caused by inappropriate mesh types can be avoided. Set the mesh parameters according to the fluid domain model, and refine the control for different regions. For example, accurately set in key parts such as the oil film to better capture the subtle changes in the oil and improve the authenticity of the simulation. Finally, generate the fluid domain mesh model with the help of mesh generation software, which can make the fluid domain mesh model fit the actual fluid domain situation. When imported into the simulation software for analysis later, it can effectively reduce the numerical discretization error, accelerate the convergence speed of the equation solver, make the simulated oil flow state closer to the real physical phenomenon, and thus provide strong support for accurately analyzing the performance of the hydrostatic turntable and optimizing its oil circuit structure.

[0072] Step S3: Import the fluid domain mesh model into the Fluent module, set the oil analysis mode of the fluid domain mesh model as steady-state analysis through the Fluent module, and set the corresponding equation solver.

[0073] Furthermore, step S3 includes:

[0074] Step S31: Import the fluid domain mesh model into the Fluent module, and set the oil analysis mode of the fluid domain mesh model as the steady-state analysis mode through the General unit of the Fluent module.

[0075] Step S32: Set the parameters of the equation solver according to the fluid characteristics and flow characteristics of the hydraulic oil. The parameters of the equation solver include the viscous heating term and gravity.

[0076] Specifically, import the fluid domain mesh model in.msh format into the Fluent module. Open the General cell in Fluent and set the oil analysis mode of the fluid domain mesh model to the steady-state analysis mode in the General cell. In this embodiment, under stable operating speed and oil supply conditions of the hydrostatic turntable, the flow state of the oil will reach a relatively stable state after a short startup stage. At this time, steady-state analysis can be used to simplify the calculation process, improve the calculation efficiency, and also meet the analysis requirements for the main performance parameters of the hydrostatic turntable (such as flow rate, pressure distribution, etc.). Set the parameters of the equation solver according to the fluid characteristics (viscosity, density, etc.) of the hydraulic oil and the known flow characteristics (such as the rotational speed of the turntable, the inlet and outlet pressures of the oil, etc.). In the Fluent module, check the viscous heating term through the Energy equation to consider the influence of the heat generated by viscous friction during the flow of the hydraulic oil on the oil performance and the temperature distribution of the turntable; check the gravity term because in actual operation, gravity will have a certain effect on the pressure distribution and flow direction of the oil, especially in the vertical direction of the turntable. At the same time, open the Setup of the Fluent module and select the structural dimension, accuracy, and the number of processors. In this embodiment, when the rotational speed of the hydrostatic turntable increases, the temperature of the hydrostatic turntable will rise. The viscosity of the hydraulic oil in the area with a higher temperature is less than that in the area with a lower temperature. The smaller the viscosity of the hydraulic oil, the easier it is to generate centrifugal force and thus centrifugal motion, increasing the centrifugal flow rate. As Figure 2 and Figure 3 Figure shows the temperature field diagrams of the hydrostatic turntable in this embodiment when it is not rotating and when it is rotating at a speed of 50 RPM. It can be seen that in the same area of the hydrostatic turntable, the temperature when rotating is higher than that when not rotating. At the same time, due to the influence of gravity, a part of the centrifugal flow rate will also be generated by the hydraulic oil. Therefore, in this embodiment, the viscous heating term and gravity are used as the parameters of the equation solver, and the corresponding centrifugal flow rate can be calculated by the equation solver in the later stage, so as to optimize the design of the oil circuit structure according to the centrifugal flow rate, improving the reliability of the hydrostatic turntable design.

[0077] In the above embodiments, a steady-state analysis mode is adopted, which is applicable to the simulation of the oil flow in the hydrostatic turntable under the stable working state. It can effectively simplify the calculation process, reduce the calculation resource requirements, and quickly obtain the oil flow characteristics under the stable working conditions, such as the distribution of the stable velocity field and pressure field, etc., providing key data for evaluating the performance of the turntable. By setting the parameters of the equation solver according to the fluid characteristics and flow characteristics of the hydraulic oil, considering the viscous heating term, the influence of the change of the temperature field on the oil flow rate during the rotation of the hydrostatic turntable can be accurately simulated. At the same time, considering the gravity factor, the hydraulic oil will generate a certain centrifugal force due to the gravity, so there will be a part of the hydraulic oil that will do centrifugal motion when following the rotation of the hydrostatic turntable, generating a centrifugal flow rate. An excessive centrifugal flow rate will cause a reduction in the hydraulic oil that should originally be used to generate the differential pressure flow rate, resulting in insufficient bearing capacity of the hydraulic oil. By considering the gravity factor, the centrifugal flow rate of the hydrostatic turntable can be determined, and thus the oil circuit structure design of the hydrostatic turntable can be optimized according to the simulated centrifugal flow rate, avoiding rework of the hydrostatic turntable generated later, improving the reliability of the design, and reducing the cost.

[0078] Step S4: Set the oil flow model based on the fluid type of the hydraulic oil corresponding to the hydrostatic turntable and configure the parameters of the oil flow model;

[0079] Further, step S4 includes:

[0080] Step S41: Set the fluid type of the hydraulic oil of the hydrostatic turntable to laminar flow through the Models unit of the Fluent module;

[0081] Step S42: Turn on the multiphase flow switch through the Models unit and select the VOF multiphase flow mode in the homogeneous model as the oil flow model;

[0082] Step S43: Set the oil flow model as a two-phase flow model and set the model parameters corresponding to the two-phase flow model.

[0083] Specifically, the model parameters include oil viscosity, volume fraction, primary phase, secondary phase, and surface tension coefficient.

[0084] Specifically, the fluid type of the hydraulic oil of the hydrostatic turntable is set to laminar flow through the Models unit of the Fluent module. According to the previous theoretical calculations and empirical judgments, the flow velocity of the oil inside the turntable is relatively low, the Reynolds number is small, and it is in the laminar flow state. Therefore, choosing the laminar flow model can accurately describe the flow characteristics of the oil. At the same time, compared with the turbulent flow model, the laminar flow model has a smaller computational amount and higher computational efficiency, making it more suitable for the simulation requirements of this embodiment. In the Models unit, turn on the multiphase flow switch and select the VOF (Volume of Fluid) multiphase flow mode in the homogeneous model as the oil flow model. Although this embodiment mainly considers the single-phase flow of hydraulic oil, in actual situations, there may be a small amount of air mixed into the oil or tiny bubbles formed in the oil. Using the VOF multiphase flow model can take into account these potential multiphase phenomena and improve the generality and accuracy of the model. At the same time, the VOF model can clearly capture the interface changes between different phases, which is of great significance for analyzing the flow behavior of the oil inside the turntable and the possible gas-liquid mixing situation. Set the oil flow model as a two-phase flow model (oil phase and gas phase), and set the model parameters corresponding to the two-phase flow model. Specifically, set the viscosity of the oil to 0.04 Pa·s, initialize the volume fraction to 1 according to the actual situation (assuming that there is no gas phase or the gas phase content is extremely small and negligible in the initial state), set the main phase as the oil phase, set the secondary phase as the gas phase, and set a reasonable surface tension coefficient according to the actual situation to consider the influence of the surface tension between the oil and the gas phase on the flow. The setting of these parameters needs to be carefully adjusted and optimized in combination with the actual oil properties and working conditions to ensure that the multiphase flow model can accurately simulate the actual flow behavior of the oil inside the turntable.

[0085] In the above embodiments, setting the fluid type of the hydraulic oil to laminar flow can achieve accurate judgment based on the actual working conditions of the hydrostatic turntable. For many hydrostatic turntable systems, the flow rate of the oil during normal operation is relatively low, and the Reynolds number is small, which conforms to the characteristics of laminar flow. Using the laminar flow model can obtain accurate flow field information at a relatively low computational cost, avoiding unnecessary complexity and waste of computational resources caused by using the turbulent flow model, thus efficiently simulating the relatively stable and orderly flow state of the oil inside the turntable, such as the circulation in the oil cavity and the uniform distribution of the oil film. By selecting the VOF multiphase flow mode and setting it as a two-phase flow model, although the hydrostatic turntable mainly involves single-phase oil flow, considering the possible situation of a small amount of air mixing or bubble generation in actual work, the comprehensiveness and flexibility of the simulation are increased. Setting parameters such as oil viscosity, volume fraction, primary phase, secondary phase, and surface tension coefficient can more realistically reflect the interaction between the oil and the possible gas phase. For example, an accurate surface tension coefficient can simulate the morphological changes of the oil at the interface in contact with the gas phase, as well as the possible separation and mixing of the gas-liquid two-phase in areas such as the inlet and outlet, making the simulation results closer to the actual physical phenomena, providing a strong guarantee for in-depth research on the performance and potential problems of the hydrostatic turntable under complex working conditions, helping to optimize the design and operating parameters of the turntable, and improving its reliability and stability.

[0086] Step S5: Set boundary condition parameters based on the actual boundary conditions of the fluid domain;

[0087] Further, step S5 includes:

[0088] Step S51: Obtain the actual boundary parameters of the fluid domain;

[0089] Step S52: Set the boundary condition parameters of the fluid domain in the Fluent module according to the actual boundary parameters. The boundary condition parameters include inlet pressure, outlet pressure, flow rate parameters, inlet thermal boundary parameters, outlet thermal boundary parameters, and wall thermal boundary parameters. The outlet pressure is the gauge pressure.

[0090] Specifically, by analyzing and measuring the actual working system of the hydrostatic turntable, the actual boundary parameters of the fluid domain are obtained. This includes the inlet pressure provided by the hydraulic station, which is measured to be 2 MPa; the outlet pressure is the gauge pressure, and according to the working environment of the turntable and the outlet connection situation, the outlet pressure is determined to be 0 MPa (i.e., communicating with the atmosphere); the inlet flow rate parameter is measured by a flow meter to be 5 L / min; the inlet thermal boundary parameter is set to 40 °C according to the oil temperature of the hydraulic station, the outlet thermal boundary parameter is set to 25 °C according to the ambient temperature, and the wall thermal boundary parameter is set to a heat flux boundary condition according to the thermal conductivity of the turntable material and the working conditions. The specific value is determined through heat conduction calculation and empirical data. Step S52: In the Fluent module, according to the above actual boundary parameters, set the boundary condition parameters of the fluid domain. In the boundary condition setting interface, set the inlet boundary as a pressure inlet, input the inlet pressure value of 2 MPa, and set the corresponding velocity boundary condition according to the inlet flow rate parameter to ensure the accuracy of the inlet flow rate; set the outlet boundary as a pressure outlet, input the outlet gauge pressure value of 0 MPa; at the same time, set the thermal boundary conditions at the inlet and outlet, input the inlet temperature of 40 °C and the outlet temperature of 25 °C respectively; for the wall boundary of the turntable, set it as a wall thermal boundary condition, input the corresponding heat flux value, and set the roughness parameter of the wall according to the actual situation of the wall (such as whether it is smooth, with or without roughness, etc.) to consider the heat exchange and frictional effect between the wall and the oil on the flow.

[0091] In the above embodiments, by accurately measuring and analyzing to obtain the actual boundary parameters, it can ensure that the starting point of the simulation is based on the real physical situation. For example, the accurate inlet pressure value determines the initial power of the oil entering the turntable, directly affecting the flow velocity and pressure distribution of the oil inside the turntable; the accurate setting of the outlet pressure (gauge pressure) reflects the pressure relationship between the turntable and the external environment, affecting the outflow characteristics of the oil and the pressure balance inside the entire turntable. Setting the boundary conditions in the Fluent module based on these actual parameters can truly reproduce the boundary state of the hydrostatic turntable in actual operation. The setting of the inlet thermal boundary parameter and the outlet thermal boundary parameter takes into account the heat exchange situation between the oil and the external environment, which is crucial for studying the change of oil temperature and its impact on viscosity and flow performance. The setting of the wall thermal boundary condition simulates the heat transfer process between the turntable wall and the oil, which can improve the thermal stability of the hydrostatic turntable and prevent the deterioration of oil performance and component wear caused by local overheating.

[0092] Step S6: Set the parameters of the spatial discretization method corresponding to the equation solver through the velocity-pressure coupling algorithm;

[0093] Furthermore, step S6 includes:

[0094] Step S61: Select the SIMPLE algorithm as the velocity-pressure coupling algorithm through the Fluent module;

[0095] Step S62: Determine the gradient, pressure, and momentum of the spatial discretization method corresponding to the equation solver based on the SIMPLE algorithm;

[0096] Step S63: Set the relaxation factor for controlling the convergence degree of the SIMPLE algorithm.

[0097] Specifically, in the Fluent module, select the SIMPLE algorithm as the velocity-pressure coupling algorithm. The SIMPLE algorithm is applied to solve incompressible fluid flow problems. For the simulation of the oil flow in the static pressure turntable in this embodiment, it can effectively handle the coupling relationship between pressure and velocity, and gradually approximate the real flow field solution through iterative calculations. It has the advantages of good computational stability and relatively fast convergence speed, and is suitable for the simulation calculation requirements of this embodiment. Determine the gradient, pressure, and momentum of the spatial discretization method corresponding to the equation solver based on the SIMPLE algorithm. In the discretization settings option of Fluent, select the central difference format for the discretization of the gradient. This format can ensure computational accuracy and has good numerical stability; adopt the second-order upwind format for the discretization of the pressure, which can effectively capture the changes in the pressure field and improve the accuracy of pressure calculation; select the QUICK format for the discretization of the momentum. This format has high accuracy in dealing with convective terms and can more accurately simulate the momentum transfer process of the oil, thereby improving the accuracy and reliability of the entire flow field calculation. Set the relaxation factor for controlling the convergence degree of the SIMPLE algorithm. The relaxation factor includes the velocity relaxation factor and the pressure relaxation factor. The value of the relaxation factor is the result of a trade-off between ensuring computational stability and convergence speed. A smaller relaxation factor can make the iterative process more stable, but will reduce the convergence speed; while a larger relaxation factor may lead to instability or even divergence in the iterative process, but can accelerate the convergence speed within a certain range.

[0098] In the above embodiments, the SIMPLE algorithm has good stability and reliability in dealing with the velocity and pressure coupling relationship of incompressible fluids. For the hydrostatic turntable system with complex oil flow, the SIMPLE algorithm can reasonably coordinate the iterative calculation process of the velocity field and the pressure field, so that in each iteration, the velocity field is calculated based on the current pressure guess value, and then the pressure field is corrected through the continuity equation, gradually approaching the true flow field solution, effectively avoiding the numerical instability problem in the calculation process and improving the success rate and accuracy of the solution. Based on the SIMPLE algorithm to determine the gradients, pressures, and momenta of the spatial discretization method, these physical quantities in the fluid mechanics control equations can be processed in a suitable numerical discretization manner. For example, adopting a suitable gradient discretization format can accurately calculate the spatial variation rate of physical quantities, and can better capture the velocity and pressure gradient changes of the oil in the turntable (especially in areas such as oil cavities and oil films), so as to more accurately simulate the flow characteristics of the oil. Setting the relaxation factor for controlling the convergence degree of the SIMPLE algorithm can optimize the convergence speed while ensuring the calculation stability. A suitable relaxation factor can balance the step size of each update in the iterative process, preventing the calculation from diverging due to too large an update amplitude or the convergence process from being too slow due to too small an update. By finely adjusting the relaxation factor, the equation solver can reach the preset convergence accuracy within a relatively reasonable number of iterations, improving the calculation efficiency.

[0099] Step S7: Initialize the equation solver and calculate the centrifugal flow rate of the hydrostatic turntable through the equation solver.

[0100] Further, S7 includes:

[0101] Step S71: Set the flow field parameters corresponding to the equation solver, and the flow field parameters include velocity, pressure, and volume fraction;

[0102] Step S72: Set the residual accuracy for judging whether the equation solver converges under the relaxation factor;

[0103] Step S73: Calculate the centrifugal flow rate of the hydrostatic turntable through the equation solver in combination with the flow field parameters;

[0104] Step S74: Judge whether the equation solver converges through the residual accuracy. If not, update the flow field parameters and return to execute Step S73.

[0105] Specifically, in the Fluent module, set the flow field parameters corresponding to the equation solver, including velocity, pressure, and volume fraction. According to the initial static state of the hydrostatic turntable and the known boundary conditions, for example, set the velocity at the inlet to the average velocity calculated based on the inlet flow rate and inlet area, and set the initial velocity values in other areas inside the turntable to be close to zero; the initial values of the pressure field can be set to a roughly linear distribution based on the inlet pressure and outlet pressure; the volume fraction is initialized to 1, indicating that the entire fluid domain is in the oil phase in the initial state. Reasonable initial values can accelerate the convergence speed and reduce the number of iterations. Set the residual accuracy used to judge whether the equation solver converges under the above relaxation factor. Set the residual accuracy of the continuity equation to 1e-5, that is, when the residual of the continuity equation is less than 1e-5, it is considered that the equation solver has converged. Combining the above-set flow field parameters, start the equation solver for iterative calculation to calculate the centrifugal flow rate of the hydrostatic turntable. During the iteration process, the equation solver will continuously update the flow field parameters according to the set algorithm and discretization method, gradually approaching the true flow field solution. Through the iterative calculation of the velocity field and pressure field, combined with the rotational angular velocity and geometric shape of the turntable, calculate the centrifugal flow rate value at each iteration step. As the iteration progresses, the centrifugal flow rate value will gradually tend to be stable. When the residual meets the convergence condition, the obtained centrifugal flow rate value at this time is the relatively accurate calculation result. In step S75, after each iteration is completed, judge whether the equation solver converges through the residual accuracy. If the equation solver does not converge, update and adjust the flow field parameters according to the current calculation results and residual conditions. For example, according to the magnitude and distribution of the residual, locally correct the initial values of the velocity field and pressure field, or adjust the value of the relaxation factor (within a certain range), and then return to execute step S73 to continue the iterative calculation until the equation solver converges.

[0106] Step S8: Select a preset number of steps and a preset step size to simulate the fluid motion state of the oil flow model, analyze the total oil flow rate of the hydrostatic turntable based on the characteristics of the fluid motion state, and calculate the differential pressure flow rate of the hydrostatic turntable through the total oil flow rate and the centrifugal flow rate

[0107] Further, step S8 includes:

[0108] Step S81: Set the time step according to the designed operating speed and flow characteristics of the hydrostatic turntable, and set the number of time steps according to the operating cycle of the hydrostatic turntable combined with the time step;

[0109] Step S82: Set the simulation animation parameters corresponding to the fluid motion state in the calculation unit of the Fluent module, and simulate the fluid motion state based on the simulation animation parameters combined with the time step, the number of time steps, and the flow field parameters to obtain the motion state simulation animation;

[0110] Step S83: Analyze the total oil flow rate of the hydrostatic turntable in combination with the motion state simulation animation, and calculate the differential pressure flow rate of the hydrostatic turntable based on the difference between the total oil flow rate and the centrifugal flow rate.

[0111] Specifically, according to the designed operating speed of the hydrostatic turntable (for example, 1000 rpm) and the known flow characteristics, the time step is set to 0.001 s. The selection of the time step is determined based on considering the rotational speed of the hydrostatic turntable, the flow variation of the oil, as well as the calculation accuracy and efficiency. A smaller time step can more accurately capture the dynamic change process of the oil in the turntable, but it will increase the calculation amount; while a larger time step may lead to inaccurate calculation results and cannot accurately reflect the real flow behavior of the oil. According to the operating cycle of the turntable (T = 60 / 1000 = 0.06 s), combined with the set time step, the number of time steps is calculated to be 60 steps. The obtained time step and number of steps settings can accurately simulate the flow state of the oil within a complete operating cycle of the turntable while ensuring the calculation accuracy. In the calculation unit of the Fluent module, set the simulation animation parameters corresponding to the fluid motion state. Select a suitable animation playback format (such as AVI format), path (specify the folder location for saving the animation file), and type (such as velocity vector animation, pressure contour animation, etc.) to ensure that the overall flow direction of the fluid structure and the distribution changes of key physical quantities can be clearly and intuitively observed in the later stage. Based on the set simulation animation parameters, combined with the previously determined time step, number of time steps, and flow field parameters, start the animation recording function of Fluent, perform simulation calculations on the fluid motion state, and generate a motion state simulation animation. During the simulation process, closely monitor the flow of the oil in the animation and check for any abnormal flow phenomena (such as vortices, backflows, local high-speed or low-speed regions, etc.). These abnormal phenomena may indicate problems in the model settings or calculation process and need to be promptly investigated and adjusted. Step S83: Analyze the total oil flow rate of the hydrostatic turntable in combination with the generated motion state simulation animation. By observing the outflow of the oil at the outlet in the animation and combining with the post-processing function of the Fluent module, obtain the total oil flow rate value within the entire simulation time period. Then, according to the previously calculated centrifugal flow rate value, calculate the differential pressure flow rate of the hydrostatic turntable, that is, differential pressure flow rate = total oil flow rate - centrifugal flow rate.

[0112] In the above embodiments, the time step is set according to the designed operating speed and flow characteristics of the hydrostatic turntable, and the number of time steps is determined in combination with the operating cycle, so as to accurately simulate the dynamic process of the turntable during actual operation. Appropriate settings of the time step and the number of steps can effectively capture the changes in the flow state of the oil at different times, ensuring that the changes in physical quantities such as the flow velocity and pressure of the oil can be accurately recorded and analyzed throughout the operating cycle, providing a reliable time discretization basis for subsequent flow rate calculations, and avoiding problems such as inaccurate simulation results or loss of key information caused by improper setting of the time step. By setting the simulation animation parameters in the Fluent module and generating a simulation animation of the motion state, the abstract oil flow data is presented in an intuitive animation form. The visualization method greatly facilitates the observation and understanding of the oil flow characteristics by researchers, and can clearly see the specific flow path, velocity distribution of the oil inside the turntable, and possible abnormal flow phenomena, which helps to quickly discover potential problem areas. By comprehensively analyzing the outflow situation of the oil at the outlet and the flow state inside the entire turntable in the animation, the total oil flow rate can be accurately obtained. Furthermore, the differential pressure flow rate is calculated based on the difference between the total flow rate and the centrifugal flow rate. Excessive centrifugal flow rate may lead to non-differential pressure losses and the risk of dry burning of the turntable. Through the flow analysis of the hydrostatic turntable, it is possible to timely detect whether the centrifugal flow rate is within a reasonable range. If it is found that the centrifugal flow rate increases abnormally, the reasons can be further investigated through the simulation results, such as whether it is caused by factors such as too high turntable speed, change in oil viscosity, or unreasonable structural design. Thus, corresponding measures can be taken for adjustment and optimization during the design of the hydrostatic turntable, such as optimizing the structural design of the turntable to change the flow path and centrifugal force distribution of the oil, or adjusting the operating parameters (such as reducing the speed) to ensure that the centrifugal flow rate is within a safe range, effectively preventing the occurrence of faults such as dry burning of the turntable, improving the working reliability and stability of the hydrostatic turntable, extending its service life, and reducing maintenance costs and production losses caused by faults.

[0113] In this embodiment, after completing the flow analysis of the hydrostatic turntable through the Fluent module, the reliability of the Fluent analysis can be judged by combining theoretical analysis. When conducting a theoretical analysis of the flow rate of the hydrostatic turntable, different from analyzing the total flow rate of the hydraulic oil and the centrifugal flow rate through the Fluent module, the differential pressure flow rate and the centrifugal flow rate are analyzed and calculated separately. By calculating using the laminar flow flat plate flow formula, the flow rate Q at r is obtained as follows:

[0114] where r represents the radius, h represents the oil film height, dp represents the differential of pressure, dr represents the differential of radius, and u represents the viscosity of the hydraulic oil.

[0115] Performing a double integral of Q with respect to pressure and diameter, the flow rate generated by the differential pressure in the sector gap is obtained as:

[0116] Among them, Δp represents the pressure difference between the inlet and the outlet, and r1 and r2 respectively represent the inner diameter and the outer diameter of the sector gap.

[0117] Considering that the flow rate generated under the action of centrifugal force can be solved starting from the static equilibrium equation of the microelement under the action of centrifugal force. At this time, its equilibrium condition is:

[0118] Among them, m represents the microelement mass, ω represents the angular velocity of the static pressure turntable, represents the angular microelement, represents the microelement length perpendicular to the radius direction, and τ represents the shear stress;

[0119] Substitute (where ρ represents the density of the hydraulic oil), (where represents the gradient of the velocity in the direction of the oil film thickness) into the above formula to obtain:

[0120] Among them, y represents the coordinate variable in the direction of the oil film thickness;

[0121] Therefore, the flow rate Q ω generated by the centrifugal force is:

[0122]

[0123] So, the flow rates generated by the centrifugal force at the four outlets of the sector cavity are respectively:

[0124]

[0125] Among them, B represents the flow-through area of each outlet, b represents the hydraulic fluid property coefficient, θ represents the flow-through angle, R represents the radius of the left outlet and the right outlet, R 3 represents the radius of the upper outlet, and R 4 represents the radius of the lower outlet.

[0126] Then the centrifugal flow rate of a single oil cavity is Q 总 = Q 上 + Q 下 + Q 左 + Q 右 .

[0127] The pressure difference flow rate and the centrifugal flow rate obtained through theoretical calculation can be used to judge the accuracy of the pressure difference flow rate and the centrifugal flow rate obtained based on Fluent analysis, so as to better optimize the oil circuit structure of the static pressure turntable during design.

[0128] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made accordingly.

[0129] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without additional statements, these terms have no special meanings, and thus should not be construed as limiting the protection scope of the present invention.

[0130] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydrostatic turntable oil flow simulation method based on Fluent, characterized in that: include: Step S1: constructing a fluid domain model corresponding to the static pressure turntable according to the structural characteristics and matching characteristics of the static pressure turntable; Step S2: meshing the fluid domain model to obtain a fluid domain mesh model; Step S3: importing the fluid domain grid model into the Fluent module, setting the oil analysis mode of the fluid domain grid model to steady-state analysis through the Fluent module, and setting a corresponding equation solver; Step S4: setting an oil flow model based on the fluid type of the hydraulic oil corresponding to the hydrostatic turntable and configuring parameters of the oil flow model; Step S5: setting boundary condition parameters based on actual boundary conditions of the fluid domain; Step S6: setting the parameters of the spatial discretization method corresponding to the equation solver through a velocity-pressure coupling algorithm; Step S7: initializing the equation solver, and calculating the centrifugal flow of the static pressure turntable by the equation solver; Step S8: Select a preset number of steps and a preset step length to simulate the fluid motion state of the oil flow model, analyze the total oil flow of the hydrostatic turntable based on the fluid motion state characteristics, and calculate the pressure difference flow of the hydrostatic turntable through the total oil flow and the centrifugal flow.

2. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 1 is characterized in that: The step S1 comprises: Step S11: obtaining a three-dimensional structural model of a hydrostatic turntable having symmetry characteristics and flow characteristics; Step S12: defining the oil circuit structural features corresponding to the static pressure turntable according to the three-dimensional structural model; Step S13: setting a three-dimensional coordinate system of the fluid domain corresponding to the static pressure turntable according to the oil circuit structure characteristics; Step S14: constructing a fluid domain model of the hydrostatic turntable by combining the oil circuit structural features with the three-dimensional coordinate system through SpaceClaim software.

3. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 1 is characterized in that: The step S2 comprises: Step S21: Acquire structural characteristics and fluid characteristics of the fluid domain of the hydraulic oil of the hydrostatic turntable; Step S22: selecting a mesh type of the fluid domain model according to the structural features and the fluid properties; Step S23: setting grid parameters according to the fluid domain model; Step S24: gridding the fluid domain model using grid division software based on the grid type and the grid parameters to obtain a fluid domain grid model.

4. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 1 is characterized in that: The step S3 comprises: Step S31: importing the fluid domain grid model into the Fluent module, and setting the oil analysis mode of the fluid domain grid model to a steady-state analysis mode through the General unit of the Fluent module; Step S32: setting parameters of an equation solver according to the fluid characteristics and flow properties of the hydraulic oil, wherein the parameters of the equation solver include viscous heating terms and gravity.

5. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 1 is characterized in that: The step S4 comprises: Step S41: setting the fluid type of the hydraulic oil of the hydrostatic turntable to laminar flow through the Models unit of the Fluent module; Step S42: turning on the multiphase flow switch of the Models unit and selecting the VOF multiphase flow mode in the homogeneous model as the oil flow model; Step S43: setting the oil flow model to a two-phase flow model and setting model parameters corresponding to the two-phase flow model.

6. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 5 is characterized in that: The model parameters include oil viscosity, volume fraction, main phase, secondary phase and surface tension coefficient.

7. The static pressure turntable flow simulation method based on Fluent according to claim 1 is characterized in that: The step S5 comprises: Step S51: obtaining actual boundary parameters of the fluid domain; Step S52: setting the boundary condition parameters of the fluid domain in the Fluent module according to the actual boundary parameters, wherein the boundary condition parameters include inlet pressure, outlet pressure, flow parameter, inlet thermal boundary parameter, outlet thermal boundary parameter and wall thermal boundary parameter, and the outlet pressure is a gauge pressure.

8. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 1 is characterized in that: The step S6 comprises: Step S61: Selecting the velocity-pressure coupling algorithm as the SIMPLE algorithm through the Fluent module; Step S62: determining the gradient, pressure and momentum of the spatial discretization method corresponding to the equation solver based on the SIMPLE algorithm; Step S63: Setting a relaxation factor for controlling the convergence degree of the SIMPLE algorithm.

9. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 8 is characterized in that: The S7 includes: Step S71: setting flow field parameters corresponding to the equation solver, wherein the flow field parameters include velocity, pressure and volume fraction; Step S72: setting the residual accuracy for judging whether the equation solver has converged under the relaxation factor; Step S73: Calculating the centrifugal flow rate of the static pressure turntable by the equation solver in combination with the flow field parameters; Step S74: determine whether the equation solver has converged based on the residual accuracy; if not, update the flow field parameters and return to step S73.

10. The hydrostatic turntable oil flow simulation method based on Fluent according to claim 9 is characterized in that: The step S8 comprises: Step S81: setting a time step according to the design operating speed and flow characteristics of the hydrostatic turntable, and setting the number of time steps according to the operating cycle of the hydrostatic turntable in combination with the time step; Step S82: setting simulation animation parameters corresponding to the fluid motion state in the calculation unit of the Fluent module, simulating the fluid motion state based on the simulation animation parameters combined with the time step, the number of time steps and the flow field parameters to obtain a motion state simulation animation; Step S83: analyzing the total oil flow of the hydrostatic turntable in combination with the motion state simulation animation, and calculating the differential pressure flow of the hydrostatic turntable based on the difference between the total oil flow and the centrifugal flow.

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