Fluent-based static pressure rotary table oil return simulation method

Abstract

The invention discloses a Fluent-based static pressure rotary table oil return simulation method. The method comprises the following steps: constructing a two-dimensional model of a static pressure rotary table based on spaeclaim software; performing grid discretization processing on the two-dimensional model, and defining boundary condition parameters; setting an oil analysis mode as transient analysis, and selecting an equation solver; based on the fluid type of the oil, an oil flowing model is set, and corresponding parameters are configured; setting an actual boundary of the oil flow model based on the boundary condition parameters; setting related parameters of a spatial discretization method corresponding to the equation solver through a speed-pressure coupling algorithm; an equation solver is initialized, the step number and the step length are selected to simulate the fluid motion state, and the oil discharge state and the oil return state are analyzed based on the image features of the fluid motion state. According to the static pressure rotary table oil return simulation method, the problem that an existing static pressure rotary table cannot avoid oil overflow caused by an unreasonable oil way structure in advance can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil return simulation, and in particular to a hydrostatic turntable oil return simulation method based on Fluent. Background Art

[0002] At present, when the hydrostatic turntable is working, the oil return speed is too slow during the oil return process due to the changes in liquid viscosity, structural shape, cavity edge effect and volume fraction of gas and liquid, which further causes the hydrostatic turntable to overflow and leak. The existing method of preventing oil overflow from the hydrostatic turntable is mainly to detect the oil overflow by continuously supplying oil at a set pressure on the basis of the structure of the hydrostatic turntable. It cannot avoid the oil overflow caused by the unreasonable oil circuit structure of the hydrostatic turntable in advance, which increases the design and production cost of the hydraulic turntable. Summary of the invention

[0003] The main purpose of the present invention is to provide a hydrostatic turntable oil return simulation method based on Fluent, so as to at least solve the problem that the hydrostatic turntable cannot avoid oil overflow in advance due to unreasonable oil circuit structure setting.

[0004] According to one aspect of the present invention, a hydrostatic turntable oil return simulation method based on Fluent is provided, comprising:

[0005] Step S1: construct a two-dimensional model corresponding to the static pressure turntable based on the spaceclaim software;

[0006] Step S2: performing grid discretization processing on the two-dimensional model corresponding to the static pressure turntable, and defining boundary condition parameters of the two-dimensional model;

[0007] Step S3: setting the oil analysis mode corresponding to the hydrostatic turntable to transient analysis in the Fluent module, and selecting the corresponding equation solver;

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

[0009] Step S5: setting the actual boundary of the oil flow model based on the boundary condition parameters of the two-dimensional model;

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

[0011] Step S7: Initialize the equation solver and select a preset number of steps and step length to simulate the fluid motion state corresponding to the oil flow model, and analyze the oil discharge state and oil return state of the hydrostatic turntable based on the image characteristics of the fluid motion state.

[0012] Furthermore, the step S1 comprises:

[0013] Step S11: obtaining a three-dimensional structural model having symmetry characteristics and flow characteristics corresponding to the static pressure turntable;

[0014] Step S12: selecting a corresponding two-dimensional coordinate system based on the symmetry characteristics and the flow characteristics of the three-dimensional structural model;

[0015] Step S13: defining key features of the oil circuit structure corresponding to the static pressure turntable based on the three-dimensional structural model;

[0016] Step S14: combining the key features with the two-dimensional coordinate system and constructing a two-dimensional model corresponding to the static pressure turntable through the Fluent module in the SpaceClaim software.

[0017] Furthermore, the step S2 comprises:

[0018] Step S21: Select the plane mesh as plane 183 high-order isoparametric unit;

[0019] Step S22: setting a grid division area and a division density based on the two-dimensional model of the static pressure turntable;

[0020] Step S23: meshing the two-dimensional model using a surface meshing technique based on the plane 183 high-order isoparametric unit;

[0021] Step S24: Optimizing the mesh of the two-dimensional model after meshing based on the size optimization technology;

[0022] Step S25: defining boundary condition parameters of the two-dimensional model after mesh optimization.

[0023] Furthermore, the step S3 comprises:

[0024] Step S31: setting the oil analysis mode of the oil flow model to a transient analysis model in the General unit of the Fluent module;

[0025] Step S32: determining the NS equation for describing the oil motion state corresponding to the oil flow model;

[0026] Step S33: Select a pressure-based equation solver for solving the NS equations.

[0027] Furthermore, the step S4 comprises:

[0028] Step S41: setting the fluid type of the hydraulic oil of the hydrostatic turntable to laminar flow in Models;

[0029] Step S42: using the multiphase flow switch in the Models and selecting the VOF multiphase flow mode in the homogeneous model as the oil flow model;

[0030] Step S43: setting the oil flow model to a two-phase flow model, and setting model parameters corresponding to the two-phase flow model.

[0031] Furthermore, the model parameters include volume fraction, main phase, secondary phase and surface tension coefficient, including specifying the volume fraction as an implicit equation, setting the main phase as air phase, the secondary phase as hydraulic oil phase and specifying the surface tension coefficient.

[0032] Furthermore, the step S5 comprises:

[0033] Step S51: determining the inlet pressure, outlet pressure and flow rate based on the boundary condition parameters of the two-dimensional model;

[0034] Step S52: setting the inlet pressure, outlet pressure and flow rate of the oil flow model in the boundary condition unit of the Fluent module based on the inlet pressure, outlet pressure and flow rate respectively;

[0035] Step S53: setting the inlet pressure to the flow inlet and selecting the phase, and setting the outlet pressure to the gauge pressure.

[0036] Furthermore, the step S6 comprises:

[0037] Step S61: Selecting the velocity-pressure coupling algorithm as the SIMPLE algorithm in the Fluent module;

[0038] Step S62: determining the gradient, pressure, momentum and volume fraction of the spatial discretization method corresponding to the equation solver based on the SIMPLE algorithm;

[0039] Step S63: selecting a control factor corresponding to the gradient, the pressure and the volume fraction.

[0040] Furthermore, the step S7 comprises:

[0041] Step S71: Initializing the flow field parameters corresponding to the equation solver, the flow field parameters including velocity, pressure and volume fraction;

[0042] Step S72: setting a time step according to the design operating speed of the hydrostatic turntable and the fluid flow characteristics, and setting the number of time steps according to the operating cycle of the hydrostatic turntable in combination with the time step;

[0043] Step S73: setting simulation animation parameters corresponding to the fluid motion state in the calculation unit of the Fluent module, and performing animation simulation on 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;

[0044] Step S74: extracting the animation simulation results to obtain a motion state simulation animation, and analyzing the oil discharge state and oil return state of the hydrostatic turntable based on the motion state simulation animation.

[0045] Furthermore, the step S72 includes:

[0046] Step S721: determining the design operating speed and fluid flow characteristics of the hydrostatic turntable, wherein the fluid flow characteristics include viscosity, speed and pressure of the hydraulic oil;

[0047] Step S722: setting a time step based on the designed operating speed combined with the viscosity, speed and pressure of the hydraulic oil;

[0048] Step S723: Determine the operation cycle of the hydrostatic turntable, and calculate the number of time steps by combining the ratio of the operation cycle to the time step.

[0049] In the present invention, by simulating the fluid motion state of the oil circuit structure of the hydrostatic turntable during design and performing fluid dynamics analysis, the possible oil overflow risk can be discovered in advance, so that the oil circuit structure of the hydrostatic turntable can be optimized and adjusted in the design stage, reducing the later transformation cost of the hydrostatic turntable. By performing grid discretization processing on the two-dimensional model of the hydrostatic turntable, the simulation accuracy of key areas such as the oil circuit edge and the oil film thickness change area can be improved, thereby improving the reliability of the overall analysis. Setting the oil analysis model to the transient analysis mode can enable the simulation to simulate the flow state of the oil at different time points, including velocity, pressure distribution, etc., so as to more comprehensively analyze the oil return process. The velocity-pressure coupling algorithm used sets the parameters of the spatial discretization method, improves the stability and convergence of the simulation calculation, and ensures the accuracy of the fluid motion state analysis. Through animation simulation and image feature analysis, the flow path, velocity distribution, pressure change, etc. of the oil in the hydrostatic turntable can be intuitively observed, and then the oil discharge state and oil return state can be deeply analyzed, which can improve the accuracy of the fluid motion state analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0051] Figure 1 It is a schematic flow chart of a hydrostatic turntable oil return simulation method based on Fluent disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can 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 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] See also Figure 1 As shown, according to an embodiment of the present application, a static pressure turntable oil return simulation method based on Fluent is provided, comprising:

[0056] Step S1: Construct a two-dimensional model corresponding to the static pressure turntable based on the SpaceClaim software.

[0057] Further, step S1 includes:

[0058] Step S11: obtaining a three-dimensional structural model having symmetry characteristics and flow characteristics corresponding to the static pressure turntable;

[0059] Step S12: selecting a corresponding two-dimensional coordinate system based on the symmetry characteristics and flow characteristics of the three-dimensional structural model;

[0060] Step S13: defining key features of the oil circuit structure corresponding to the hydrostatic turntable based on the three-dimensional structural model;

[0061] Step S14: Combine the key features with the two-dimensional coordinate system and construct a two-dimensional model corresponding to the static pressure turntable through the spaceclaim software.

[0062] Specifically, first obtain a three-dimensional structural model with symmetry and flow characteristics of the hydrostatic turntable in the design stage, and select a two-dimensional coordinate system based on the symmetry and flow characteristics of the three-dimensional structural model. Since the hydrostatic turntable usually has rotational symmetry, a plane passing through the rotation axis and perpendicular to the main flow direction of the oil is selected as the projection surface of the two-dimensional model. Determine the origin, X-axis and Y-axis directions of the two-dimensional coordinate system. In the three-dimensional structural model, identify and define the key features of the oil circuit structure, including the position, size, shape and distribution of the oil holes, the direction, branches and intersections of the oil circuits, etc. Open the SpaceClaim software to import the acquired three-dimensional structural model, and project the key features of the three-dimensional structural model onto the selected two-dimensional coordinate system to obtain the two-dimensional model corresponding to the hydrostatic turntable. The symmetrical three-dimensional structural model of this embodiment can better simplify the two-dimensional plane model, and the three-dimensional structural model with flow characteristics can realize the construction of the oil flow model of the hydrostatic turntable, thereby better analyzing the fluid motion state of the hydrostatic turntable.

[0063] Step S2: Perform grid discretization processing on the two-dimensional model corresponding to the static pressure turntable, and define boundary condition parameters of the two-dimensional model.

[0064] Further, step S2 includes:

[0065] Step S21: Select the plane mesh as plane 183 high-order isoparametric unit;

[0066] Step S22: setting the grid division area and division density based on the two-dimensional model of the static pressure turntable;

[0067] Step S23: Meshing the two-dimensional model using the surface meshing technology based on the plane 183 high-order isoparametric unit;

[0068] Step S24: Optimizing the mesh of the two-dimensional model after meshing based on the size optimization technology;

[0069] Step S25: defining boundary condition parameters of the two-dimensional model after mesh optimization.

[0070] Specifically, the finite element analysis unit type of the Fluent module is set to plane 183 high-order isoparametric unit, and the corresponding mesh division area and division density are set according to the characteristics of the two-dimensional model of the hydrostatic turntable. The mesh division area and division density are set according to the geometric characteristics of the two-dimensional model. For example, in stress concentration areas or areas where the physical field changes drastically, denser meshes need to be divided. Select plane 183 high-order isoparametric units to use the face meshing function (face meshing) to mesh the two-dimensional model of the hydrostatic turntable to obtain a preliminary mesh division model. Use the mesh optimization function (sizecontrol) to optimize the mesh in the mesh division model after division to improve the mesh quality. Finally, define the boundary condition parameters of the two-dimensional model after mesh optimization.

[0071] In this embodiment, the plane 183 high-order isoparametric unit is used to perform finite element analysis on the two-dimensional model of the hydrostatic turntable. The plane 183 high-order isoparametric unit has a high-order shape function, which can more accurately describe the geometric shape of the hydrostatic turntable and the changes in the physical field, and can improve the quality of mesh division and the accuracy of analysis. By reasonably setting the mesh division area and division density, the amount of calculation in non-critical areas can be reduced while ensuring the analysis accuracy of key areas, thereby improving the overall calculation efficiency. The size optimization technology is used to further optimize the grid, eliminate or reduce the distorted units and low-quality units in the model, ensure the stability and reliability of the analysis results, and also help shorten the calculation time. By setting the boundary condition parameters, it can be ensured that the simulation results are closer to the actual situation, and the practicality and reliability of the analysis results can be improved.

[0072] Step S3: In the Fluent module, set the oil analysis mode corresponding to the hydrostatic turntable to transient analysis, and select the corresponding equation solver.

[0073] Specifically, step S3 includes:

[0074] Step S31: setting the oil analysis mode of the oil flow model to a transient analysis model in the General unit of the Fluent module;

[0075] Step S32: determining the NS equation for describing the oil motion state corresponding to the oil flow model;

[0076] Step S33: Select a pressure-based equation solver for solving the NS equations.

[0077] Furthermore, in the "General" setting unit of the Fluent module, the oil analysis mode is set to "Transient", the NS equation (Navier-Stokes, an equation used to describe the state of fluid motion) is used to describe the oil flow, and a pressure-based solver is selected in the Fluent module to solve the NS equation. By setting the analysis mode to transient, the dynamic flow process of the oil in the hydrostatic turntable can be simulated more accurately. Using the NS equations in Fluent can fully describe the behavior of the oil under complex flow conditions. Selecting a pressure-based solver has high computational efficiency and stability for the flow problem of oil in the hydrostatic turntable, can effectively deal with the pressure-velocity coupling problem, and speed up the convergence speed.

[0078] Step S4: setting an oil flow model based on the fluid type of the oil corresponding to the hydrostatic turntable and configuring parameters corresponding to the oil flow model.

[0079] Further, step S4 includes:

[0080] Step S41: setting the fluid type of the hydraulic oil of the hydrostatic turntable to laminar flow in Models;

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

[0082] Step S43: setting the oil flow model to a two-phase flow model, and setting model parameters corresponding to the two-phase flow model.

[0083] The model parameters include volume fraction, main phase, secondary phase and surface tension coefficient, including specifying the volume fraction as an implicit equation, setting the main phase as the air phase, the secondary phase as the hydraulic oil phase and specifying the surface tension coefficient.

[0084] Specifically, enter the model setting area through the "Models" menu of the Fluent module and set the fluid type of the hydraulic oil of the hydrostatic turntable to laminar flow. Check the "Multiphase" option in the "Models" menu to activate the multiphase flow model. In the multiphase flow model option, select the "Volume of Fluid (VOF)" model. The VOF model is mainly used to track the interface between two or more immiscible liquids, and is suitable for the interface tracking between the hydraulic oil and gas in this embodiment. In the VOF model setting, confirm that the number of phases is "2", that is, a two-phase flow model. Because the volume occupied by air in the mixture of hydraulic oil and gas of the hydrostatic turntable in this embodiment is relatively large, the main phase is set to "air phase" and the secondary phase is set to "hydraulic oil phase". The "hydraulic oil phase" is the phase that needs to be tracked and simulated. Finally, set the volume fraction in the VOF model to an implicit equation. The volume fraction is used to describe the proportion of each phase in the grid unit. For example, the volume fraction of the hydraulic oil phase at the initial position of the hydraulic oil is set to 1 (completely occupied), and 0 (no hydraulic oil) at other positions. According to the actual surface tension value between hydraulic oil and air, the corresponding surface tension coefficient is input in the VOF model setting.

[0085] In this embodiment, the VOF model of multiphase flow can accurately track the interface changes between different fluids. By setting parameters such as volume fraction, main phase, secondary phase and surface tension coefficient, the physical process of oil flow can be described more accurately. The implicit equation for volume fraction calculation can adapt to more complex flow conditions, and the setting of main and secondary phases and surface tension coefficient can better simulate the dynamic behavior at the interface between oil and air.

[0086] Step S5: Setting the actual boundary of the oil flow model based on the boundary condition parameters of the two-dimensional model.

[0087] Further, step S5 includes:

[0088] Step S51: determining the inlet pressure, outlet pressure and flow rate based on the boundary condition parameters of the two-dimensional model;

[0089] Step S52: setting the inlet pressure, outlet pressure and flow rate of the oil flow model in the boundarycondition unit of the Fluent module based on the inlet pressure, outlet pressure and flow rate respectively;

[0090] Step S53: Set the inlet pressure to the flow inlet and select the phase, and set the outlet pressure to the gauge pressure.

[0091] Assuming that the inlet pressure is set to 10MPa (megapascals) according to the working requirements of the hydrostatic turntable, the outlet pressure is set to the ambient pressure plus the possible pressure drop of the turntable, which is assumed to be 0.1MPa (gauge pressure, that is, pressure relative to atmospheric pressure). Then select the "Boundary Conditions" unit in the Fluent module, select the hydraulic oil phase in the "Phase" tab, enter 10MPa in the "Gauge Total Pressure" field, and enter 0.1MPa (gauge pressure) in the "Gauge Pressure" field. Setting boundary conditions such as inlet pressure, outlet pressure, and flow can ensure that the simulation process is closer to the actual working conditions and make the simulation of the flow behavior of the oil in the hydrostatic turntable more accurate.

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

[0093] Further, step S6 includes:

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

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

[0096] Step S63: Select control factors corresponding to the gradient, pressure and volume fraction.

[0097] Specifically, in the Fluent module, the solution algorithm corresponding to the pressure-based solver is set to the SIMPLE algorithm based on the "Solution Methods" unit. Then, the spatial discretization method corresponding to the equation solver is set, including the calculation method of the gradient, the processing method of the pressure term, the discrete format of the momentum equation, and the interpolation method of the volume fraction. Then, the control factors corresponding to the gradient, pressure, and volume fraction are selected respectively. The SIMPLE algorithm realizes the coupling of the velocity field and the pressure field by iteratively solving the momentum equation and the pressure correction equation, so that the fluid flow process can be simulated more accurately. The gradient, pressure, momentum, and volume fraction of the spatial discretization method determined by the SIMPLE algorithm can more accurately describe the distribution and changes of the fluid in space. By optimizing the parameter setting of the spatial discretization method through the control factor, the numerical oscillation phenomenon in the simulation process can be effectively avoided, and the stability and reliability of the simulation results can be ensured.

[0098] Step S7: Initialize the equation solver and select a preset number of steps and step length to simulate the fluid motion state corresponding to the oil flow model, and analyze the oil discharge state and oil return state of the hydrostatic turntable based on the image characteristics of the fluid motion state.

[0099] Further, step S7 includes:

[0100] Step S71: Initialize the flow field parameters corresponding to the equation solver, the flow field parameters including velocity, pressure and volume fraction;

[0101] Step S72: setting the time step length according to the design operating speed of the hydrostatic turntable and the fluid flow characteristics, and setting the number of time steps according to the operating cycle of the hydrostatic turntable combined with the time step length;

[0102] Step S721: determining the design operating speed and fluid flow characteristics of the hydrostatic turntable, where the fluid flow characteristics include viscosity, speed and pressure of the hydraulic oil;

[0103] Step S722: setting the time step based on the design operating speed combined with the viscosity, speed and pressure of the hydraulic oil;

[0104] Step S723: Determine the operation cycle of the hydrostatic turntable, and calculate the number of time steps by combining the ratio of the operation cycle to the time step.

[0105] Step S73: setting simulation animation parameters corresponding to the fluid motion state in the calculation unit of the Fluent module, and performing animation simulation on 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;

[0106] Step S74: extracting the animation simulation results to obtain the motion state simulation animation, and analyzing the oil discharge state and oil return state of the hydrostatic turntable based on the motion state simulation animation.

[0107] Specifically, define a monitoring report for monitoring the inlet flow and outlet flow of the fluid structure, and determine whether oil spill will occur under the fluid structure by analyzing the inlet flow and outlet flow of the monitored fluid structure. Define the residual accuracy and the continuity equation and the oil-liquid volume fraction equation accuracy corresponding to the spatial discretization method. Assume it is 1*10^-5, which means that the difference between the current value and the previous value is less than 10^-5, which means that the continuity equation and the oil-liquid volume fraction equation have reached the convergence condition. Set the time step and time step number used to describe the fluid motion state. Set the simulation animation parameters corresponding to the fluid motion state in the calculation unit of the Fluent module. The simulation animation parameters include the animation playback format, path and type. The setting of the simulation animation parameters can ensure that the later animation can perfectly observe the overall flow direction of the fluid structure. According to the set time step, number of time steps and simulation animation parameters, the fluid motion state of the hydrostatic turntable is animated to obtain a motion state simulation animation. The oil discharge characteristics and oil return characteristics of the turntable structure are analyzed through the motion state simulation animation. The inlet flow curve and outlet flow curve are constructed according to the motion state simulation animation. According to the inlet flow curve and outlet flow curve, if the outlet flow is greater than the inlet flow, it indicates that the oil return speed of the hydrostatic turntable is slow, and hydraulic oil will accumulate, and then the hydraulic oil will overflow. Further, according to the motion state simulation animation, a velocity vector diagram and a pressure distribution diagram are constructed to analyze the reasons for the slow oil return speed and hydraulic oil overflow, such as uneven oil film thickness, excessive oil temperature, etc. According to the reasons for the hydraulic oil overflow, the oil circuit structure design of the hydrostatic turntable or the oil parameters are adjusted to avoid oil overflow.

[0108] In this embodiment, by initializing the flow field parameters corresponding to the equation solver, accurate initial conditions can be provided for the simulation calculation of the fluid motion state of the hydrostatic turntable, which helps to improve the accuracy of the simulation results. The time step is set according to the design operating speed of the hydrostatic turntable and the fluid flow characteristics, and the number of time steps is calculated in combination with the operating cycle, ensuring that the simulation process can capture the key characteristics of the fluid motion and avoiding simulation errors caused by improper time steps. The simulation animation parameters corresponding to the fluid motion state are set to perform animation simulation of the fluid motion state in combination with the time step and the number of time steps, which facilitates the analysis of the changing trend of the fluid motion state.

[0109] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0110] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0111] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydrostatic turntable oil return simulation method based on Fluent, characterized in that: include: Step S1: construct a two-dimensional model corresponding to the static pressure turntable based on the spaceclaim software; Step S2: performing grid discretization processing on the two-dimensional model corresponding to the static pressure turntable, and defining boundary condition parameters of the two-dimensional model; Step S3: setting the oil analysis mode corresponding to the hydrostatic turntable to transient analysis in the Fluent module, and selecting the corresponding equation solver; Step S4: setting an oil flow model based on the fluid type of the oil corresponding to the hydrostatic turntable and configuring parameters corresponding to the oil flow model; Step S5: setting the actual boundary of the oil flow model based on the boundary condition parameters of the two-dimensional model; Step S6: setting relevant parameters of the spatial discretization method corresponding to the equation solver through a velocity-pressure coupling algorithm; Step S7: Initialize the equation solver and select a preset number of steps and step length to simulate the fluid motion state corresponding to the oil flow model, and analyze the oil discharge state and oil return state of the hydrostatic turntable based on the image characteristics of the fluid motion state.

2. The hydrostatic turntable oil return 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 having symmetry characteristics and flow characteristics corresponding to the static pressure turntable; Step S12: selecting a corresponding two-dimensional coordinate system based on the symmetry characteristics and the flow characteristics of the three-dimensional structural model; Step S13: defining key features of the oil circuit structure corresponding to the static pressure turntable based on the three-dimensional structural model; Step S14: constructing a two-dimensional model corresponding to the hydrostatic turntable by using spaceclaim software in combination with the key features and the two-dimensional coordinate system.

3. The hydrostatic turntable oil return simulation method based on Fluent according to claim 1 is characterized in that: The step S2 comprises: Step S21: Select the plane mesh as plane 183 high-order isoparametric unit; Step S22: setting a grid division area and a division density based on the two-dimensional model of the static pressure turntable; Step S23: meshing the two-dimensional model using a surface meshing technique based on the plane 183 high-order isoparametric unit; Step S24: Optimizing the mesh of the two-dimensional model after meshing based on the size optimization technology; Step S25: defining boundary condition parameters of the two-dimensional model after mesh optimization.

4. The hydrostatic turntable oil return simulation method based on Fluent according to claim 1 is characterized in that: The step S3 comprises: Step S31: setting the oil analysis mode of the oil flow model to a transient analysis model in the General unit of the Fluent module; Step S32: determining the NS equation for describing the oil motion state corresponding to the oil flow model; Step S33: Select a pressure-based equation solver for solving the NS equations.

5. The hydrostatic turntable oil return 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 in Models; Step S42: using the multiphase flow switch in the Models 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 return simulation method based on Fluent according to claim 5 is characterized in that: The model parameters include volume fraction, main phase, secondary phase and surface tension coefficient, including setting the volume fraction as an implicit equation, setting the main phase as air phase, the secondary phase as hydraulic oil phase and setting the surface tension coefficient.

7. The hydrostatic turntable oil return simulation method based on Fluent according to claim 1 is characterized in that: The step S5 comprises: Step S51: determining the inlet pressure, outlet pressure and flow rate based on the boundary condition parameters of the two-dimensional model; Step S52: setting the inlet pressure, outlet pressure and flow rate of the oil flow model in the boundarycondition unit of the Fluent module respectively based on the inlet pressure, outlet pressure and flow rate; Step S53: setting the inlet pressure to the flow inlet and selecting the phase, and setting the outlet pressure to the gauge pressure.

8. The hydrostatic turntable oil return 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 in the Fluent module; Step S62: determining the gradient, pressure, momentum and volume fraction of the spatial discretization method corresponding to the equation solver based on the SIMPLE algorithm; Step S63: selecting a control factor corresponding to the gradient, the pressure and the volume fraction.

9. The hydrostatic turntable oil return simulation method based on Fluent according to claim 1, characterized in that: The step S7 comprises: Step S71: Initializing the flow field parameters corresponding to the equation solver, the flow field parameters including velocity, pressure and volume fraction; Step S72: setting a time step according to the design operating speed of the hydrostatic turntable and the fluid flow characteristics, and setting the number of time steps according to the operating cycle of the hydrostatic turntable in combination with the time step; Step S73: setting simulation animation parameters corresponding to the fluid motion state in the calculation unit of the Fluent module, and performing animation simulation on 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; Step S74: extracting the animation simulation results to obtain a motion state simulation animation, and analyzing the oil discharge state and oil return state of the hydrostatic turntable based on the motion state simulation animation.

10. The hydrostatic turntable oil return simulation method based on Fluent according to claim 9, characterized in that: The step S72 comprises: Step S721: determining the design operating speed and fluid flow characteristics of the hydrostatic turntable, wherein the fluid flow characteristics include viscosity, speed and pressure of the hydraulic oil; Step S722: setting a time step based on the designed operating speed combined with the viscosity, speed and pressure of the hydraulic oil; Step S723: Determine the operation cycle of the hydrostatic turntable, and calculate the number of time steps by combining the ratio of the operation cycle to the time step.

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