Active ventilation, load reduction and stability augmentation simulation method suitable for simultaneous ejection of multiple navigation bodies

Abstract

The invention discloses an active ventilation, load reduction and stability augmentation simulation method suitable for simultaneous ejection of multiple navigation bodies. Comprising the steps that numerical simulation software calls physical parameters of an improved delay separation vortex model, a cavitation model, a multiphase flow model and a three-dimensional multi-navigation-body geometric model, a solver, ventilation flow and a time step length, node flow field data of each grid in a computational domain is solved, and a simulation result is generated according to the node flow field data of all the grids. Simulation results corresponding to different ventilation flows can be obtained through numerical simulation software, so that load reduction and stability augmentation effects corresponding to different ventilation flows can be visually seen, the optimal ventilation flow can be determined, and the method is of great significance to research of underwater jet of the navigation body.

Description

Technical Field

[0001] The present invention relates to the technical field of water exit of a navigation body across a medium, and more specifically, to an active ventilation, load reduction and stabilization simulation method applicable to the simultaneous water exit of multiple navigation bodies. Background Art

[0002] Underwater salvo refers to the process of ejecting two or more vehicles from the tube in a short time. However, cavitation is inevitable during the underwater salvo of high-speed vehicles, and strong high-frequency pulsating impact loads will be generated during the water exit stage. At the same time, flow interference is inevitable between the vehicles during the salvo.

[0003] At present, the method of reducing load and increasing stability during underwater salvo firing of a navigation body mainly adopts passive means, that is, a certain amount of high-pressure gas is filled inside the navigation body. When the navigation body moves toward the water surface at a certain water depth, the hydrostatic pressure around the navigation body continues to decrease, resulting in a continuous increase in the pressure difference between the internal cavity and the outside of the navigation body. At this time, the internal gas begins to exhaust to the outside, and the exhaust cavitation gradually merges into a large cavity, wrapping the surface of the navigation body, thereby achieving the effects of drag reduction, load reduction and stabilization.

[0004] However, passive exhaust technology has high requirements for exhaust flow rate, so it is necessary to study the load reduction and stabilization effects corresponding to different exhaust flow rates.

[0005] In view of this, the present invention provides an active ventilation, load reduction and stabilization simulation method suitable for launching multiple navigation bodies out of water at the same time. Summary of the invention

[0006] In view of this, the present invention provides an active ventilation load reduction and stabilization simulation method applicable to multiple navigation bodies launching out of water at the same time, comprising:

[0007] The improved delayed detached eddy model, cavitation model and multiphase flow model were coupled with numerical simulation software;

[0008] Establishing a three-dimensional multi-vehicle geometric model in the numerical simulation software, wherein the three-dimensional multi-vehicle geometric model is defined with a calculation domain, wherein the calculation domain includes an area where the three-dimensional multi-vehicle geometric model is located and a blank area, and generating a grid in the blank area;

[0009] Setting physical parameters and solver of the three-dimensional multi-vehicle geometric model;

[0010] Select ventilation flow rate and time step;

[0011] The numerical simulation software calls the physical parameters of the improved delayed detached vortex model, the cavitation model, the multiphase flow model, the three-dimensional multi-vehicle geometric model, the solver, the ventilation flow rate and the time step, and solves the node flow field data of each grid in the calculation domain; and generates simulation results based on the node flow field data of all the grids.

[0012] Optionally, the three-dimensional multi-vehicle geometric model includes at least two vehicle monomer geometric models, and all the vehicle monomer geometric models in the three-dimensional multi-vehicle geometric model are the same;

[0013] The three-dimensional multi-navigation body geometric model is defined by a Cartesian coordinate system, and all the single-unit geometric models of the navigation bodies are arranged in an array around the origin of the Cartesian coordinate system.

[0014] Optionally, before generating a grid in the blank area, the method further includes:

[0015] Determining the boundary conditions of the calculation domain includes: setting the circumferential orifice boundary conditions of the calculation domain as a flow inlet, and setting the surrounding boundary conditions of the calculation domain as a pressure outlet.

[0016] Optionally, generating a grid in the blank area includes:

[0017] Setting the number of boundary layer grid layers, the boundary layer grid type and the growth rate, wherein the numerical simulation software generates a boundary layer grid that wraps the geometric model of the navigation body monomer according to the number of boundary layer grid layers, the boundary layer grid type and the growth rate;

[0018] Setting the background grid type, and performing grid division on the area of ​​the blank area where the boundary layer grid is not located according to the size of the boundary layer grid away from the side of the geometric model of the vehicle monomer and the background grid type, to generate a background grid;

[0019] Setting an encrypted area, wherein the encrypted area penetrates the calculation domain along the extension direction of the single body geometric model of the navigation body, and the orthographic projection of the three-dimensional multi-navigation body geometric model along the extension direction of the single body geometric model of the navigation body is located within the orthographic projection range of the calculation domain along the extension direction of the single body geometric model of the navigation body;

[0020] The grid in the encrypted area is encrypted.

[0021] Optionally, setting the physical parameters of the three-dimensional multi-vehicle geometric model includes:

[0022] Acquiring physical parameters of the navigation object, wherein the physical parameters of the navigation object include mass, center of mass and moment of inertia;

[0023] The physical parameters of the navigation body are formed into a script, and the script is imported into the numerical simulation software. The numerical simulation software sets the physical parameters of the three-dimensional multi-navigation body geometric model according to the script.

[0024] Optionally, the solver includes a six-free motion solver, a separated flow solver, a separated energy solver and a turbulence solver.

[0025] Optionally, the boundary layer grid type is a prismatic layer grid, and the background grid type is a polyhedral grid.

[0026] Compared with the prior art, the active ventilation, load reduction and stabilization simulation method for multiple navigation bodies launching out of water at the same time provided by the present invention achieves at least the following beneficial effects:

[0027] The present invention provides an active ventilation load reduction and stabilization simulation method suitable for multiple navigation bodies to be launched out of water at once. The numerical simulation software calls the physical parameters of the improved delayed detached vortex model, cavitation model, multiphase flow model, three-dimensional multi-navigation body geometric model, solver, ventilation flow rate and time step, solves the node flow field data of each grid in the calculation domain, and generates simulation results according to the node flow field data of all grids. The simulation results corresponding to different ventilation flow rates can be obtained through the numerical simulation software, so that the load reduction and stabilization effects corresponding to different ventilation flow rates can be intuitively seen, which is helpful to determine the optimal ventilation flow rate, and is of great significance to the research on underwater salvo of navigation bodies.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0029] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0031] Figure 1 It is a flow chart of an active ventilation, load reduction and stabilization simulation method applicable to the simultaneous launch of multiple navigation bodies out of water provided by the present invention.

[0032] Figure 2 It is a structural schematic diagram of the single body geometric model of the navigation body.

[0033] Figure 3 It is a comparison diagram of the flow field and motion state of a twin-engine vehicle under different ventilation volumes.

[0034] Figure 4 It is the curve of the evolution of friction coefficient with dimensionless time.

[0035] Figure 5 is the dimensionless time evolution curve of the lateral load factor.

[0036] Figure 6 It is a graph showing the evolution of the deflection angle versus the dimensionless vertical displacement. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0038] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0039] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0040] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0041] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] Reference Figure 1 , Figure 1 The present invention provides a flow chart of an active ventilation, load reduction and stabilization simulation method applicable to multiple navigation bodies being launched out of water at the same time, to illustrate a specific embodiment of an active ventilation, load reduction and stabilization simulation method applicable to multiple navigation bodies being launched out of water at the same time, including:

[0043] S101: Coupling the improved delayed detached eddy model, cavitation model and multiphase flow model with numerical simulation software;

[0044] S102: establishing a three-dimensional multi-vehicle geometric model in numerical simulation software, wherein the three-dimensional multi-vehicle geometric model is defined with a computational domain, the computational domain includes an area where the three-dimensional multi-vehicle geometric model is located and a blank area, and generating a grid in the blank area;

[0045] S103: Setting physical parameters and solver of the three-dimensional multi-vehicle geometric model;

[0046] S104: Select ventilation flow and time step;

[0047] S105: The numerical simulation software calls the physical parameters, solver, ventilation flow rate and time step of the improved delayed detached vortex model, cavitation model, multiphase flow model, and three-dimensional multi-vehicle geometric model, and solves the node flow field data of each grid in the calculation domain; and generates simulation results based on the node flow field data of all grids.

[0048] It should be noted that in step S101, the numerical simulation software can also directly use the commercial software STAR-CCM, which is coupled with an improved delayed detached eddy model (IDDES), a cavitation model and a multiphase flow model, and does not need to perform model coupling operations, which is more convenient to use. Specifically, in this embodiment, the cavitation model uses the Schnerr-Sauer cavitation model, and the multiphase flow model uses the VOF multiphase flow model. Of course, it is not limited to this, and the model can also be adjusted according to actual needs. This embodiment does not make specific restrictions on this.

[0049] It is understandable that the improved delayed detached vortex model can grasp the laws and characteristics of turbulent motion in advance and improve the understanding of the evolution of turbulent flow field laws by calculating, analyzing and predicting parameters such as flow field and pressure field. The Schnerr-Sauer cavitation model is a mass transport cavitation model that does not require empirical constants. It also takes into account the effects of bubble acceleration, viscosity effects, and surface tension effects, and can accurately simulate the evolution of underwater launch bubbles. The VOF multiphase flow model is mainly used for detailed simulation of the water-air interface.

[0050] Compared with the existing technology, the numerical simulation software uses the physical parameters, solver, ventilation flow rate and time step of the improved delayed detached vortex model, cavitation model, multiphase flow model, and three-dimensional multi-navigation body geometric model, solves the node flow field data of each grid in the calculation domain, and generates simulation results based on the node flow field data of all grids. The simulation results corresponding to different ventilation flow rates can be obtained through the numerical simulation software, so that the load reduction and stabilization effect corresponding to different ventilation flow rates can be intuitively seen, which helps to determine the optimal ventilation flow rate and is of great significance to the study of underwater salvos of navigation bodies.

[0051] In some optional embodiments, referring to Figure 1 and Figure 2 , Figure 2 It is a structural schematic diagram of a single-body geometric model of a navigation body. The three-dimensional multi-navigation body geometric model includes at least two single-body geometric models of navigation bodies. All single-body geometric models of navigation bodies in the three-dimensional multi-navigation body geometric model are the same.

[0052] The three-dimensional multi-navigation body geometric model is defined with a Cartesian coordinate system, and all the single-body geometric models of the navigation bodies are arranged in an array around the origin of the Cartesian coordinate system.

[0053] It should be noted that, refer to Figure 2 , to illustrate the specific size of a single body geometric model of a sailing body. Along the extension direction of the single body geometric model of the sailing body, the length of the single body geometric model of the sailing body is L; the maximum diameter of the single body geometric model of the sailing body is D; the side wall of the single body geometric model of the sailing body is provided with N vents, and the N vents are arranged around the side wall of the single body geometric model of the sailing body, and the diameter of the vent is D h , the distance between the centers of two adjacent vents is S; along the extension direction of the vehicle body geometric model, the distance from the top of the vehicle body geometric model to the vent is L h .

[0054] It can be understood that in the process of generating a three-dimensional multi-vehicle geometric model in the numerical simulation software, the single-vehicle geometric model is given specific dimensions, thereby also determining the specific dimensions of the three-dimensional multi-vehicle geometric model. When the numerical simulation software solves the node flow field data of each grid, the numerical simulation software can directly obtain the required dimensional data.

[0055] In some optional embodiments, before generating a grid in the blank area, the method further includes:

[0056] Determine the boundary conditions of the computational domain, including: setting the circumferential orifice boundary conditions of the computational domain as the flow inlet, and setting the surrounding boundary conditions of the computational domain as the pressure outlet.

[0057] It should be noted that when solving the node flow field data of the grid of the computational domain, it is essential to set the circumferential orifice boundary conditions of the computational domain and the surrounding boundary conditions of the computational domain. However, when the three-dimensional multi-vehicle geometric model only includes two single-vehicle geometric models, the transverse symmetry plane of the three-dimensional multi-vehicle geometric model can also be set as the symmetry boundary. The transverse symmetry plane passes through the center lines of the two single-vehicle geometric models. After setting the symmetry boundary, the amount of calculation can be greatly reduced and the calculation efficiency can be improved.

[0058] In some optional embodiments, generating a grid in a blank area includes:

[0059] Set the number of boundary layer grid layers, boundary layer grid type and growth rate. The numerical simulation software generates a boundary layer grid that wraps the geometric model of the single body of the navigation body according to the number of boundary layer grid layers, boundary layer grid type and growth rate.

[0060] Set the background grid type, and according to the size of the boundary layer grid away from the side of the geometric model of the vehicle body and the background grid type, mesh the area where the non-boundary layer grid is located in the blank area to generate the background grid;

[0061] An encrypted area is set, and the encrypted area passes through the calculation domain along the extension direction of the single geometric model of the navigation body, and the orthographic projection of the three-dimensional multi-navigation body geometric model along the extension direction of the single geometric model of the navigation body is located within the orthographic projection range of the calculation domain along the extension direction of the single geometric model of the navigation body;

[0062] Encrypt the mesh in the encrypted area.

[0063] It should be noted that, in this embodiment, the value range of the growth rate r is 1<r≤1.2, of course, it is not limited to this, and can also be adjusted according to actual needs. When the numerical simulation software generates the first layer of boundary layer grids that wrap the geometric model of the navigation body according to the number of boundary layer grid layers, the boundary layer grid type and the growth rate, the height of the first layer of boundary layer grids can be calculated according to the following formula:

[0064]

[0065] Where y is the height of the first boundary layer grid, y + is the grid volume coefficient. In this embodiment, y + The value of is determined by the improved delayed detached eddy model, y + The value range is 1 to 10, μ is the dynamic viscosity, μ t is the friction velocity and ρ is the fluid velocity.

[0066] It can be understood that the boundary layer grid and the background grid are generated in the blank area respectively, and the boundary layer grid and the background grid can slide to transmit information, and the background grid also plays a role of constraint. By meshing the blank area in the manner of this embodiment, the geometric model of the navigation body can move in six freedoms, which is helpful to realize the attitude evolution simulation under the mutual interference of multiple navigation body geometric models, and can also improve the accuracy and efficiency of subsequent grid calculation. The positive projection of the three-dimensional multi-navigation body geometric model along the extension direction of the navigation body monomer geometric model is located in the positive projection range of the calculation domain along the extension direction of the navigation body monomer geometric model, that is, the encrypted area covers the area where the cavitation is generated, and the mesh of the encrypted area is encrypted, which can capture the details of the cavitation more accurately. Specifically, the diameter of the positive projection of the calculation domain along the extension direction of the navigation body monomer geometric model is 5 times the maximum diameter of the navigation body monomer geometric model, which can achieve high-precision capture and reduce the amount of calculation. Of course, it is not limited to this. The specific size of the encrypted area can be adjusted according to actual needs, and this embodiment does not make specific restrictions on this.

[0067] In some optional embodiments, setting the physical parameters of the three-dimensional multi-vehicle geometric model includes:

[0068] Obtain the physical parameters of the navigation body, including mass, center of mass, moment of inertia, etc.;

[0069] The physical parameters of the navigation body are formed into a script, and the script is imported into the numerical simulation software. The numerical simulation software sets the physical parameters of the three-dimensional multi-navigation body geometric model according to the script.

[0070] It is understandable that since the influence of the gravity of the navigation body needs to be considered in the calculation process, the physical parameters of the navigation body need to be involved in the calculation. When the physical parameters of the navigation body are imported into the numerical simulation software through the script, the file type of the script can be .txt. Of course, it is not limited to this.

[0071] In some optional embodiments, the solver includes a six-freedom motion solver, a separated flow solver, a separated energy solver, and a turbulence solver.

[0072] It can be understood that the solver is used to solve the coupled equations consisting of the improved delayed detached vortex model, cavitation model, multiphase flow model and the six-free motion of the navigation body. Specifically, the Baumgarte constraint stability parameters α and β in the six-free motion solver directly affect the prediction accuracy of the navigation body's underwater motion, where the value range of α is 9-11 and the value range of β is 32-34. The separation flow solver is mainly the relaxation factor of the velocity and pressure in the flow field, where the value range of the velocity relaxation factor is 0.65-0.85, and the value range of the pressure relaxation factor is 0.13-0.33. The separation energy solver is mainly the fluid sub-relaxation factor, where the value range of the fluid sub-relaxation factor is 0.78-0.98. The turbulence solver is mainly the sub-relaxation factor, and the value range of the sub-relaxation factor is 0.71-0.91.

[0073] In some optional embodiments, the boundary layer mesh type is a prismatic layer mesh, and the background mesh type is a polyhedral mesh.

[0074] In some optional embodiments, referring to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3 This is a comparison diagram of the flow field and motion state of a twin-engine vehicle under different ventilation volumes. Figure 4 is the curve of the friction coefficient evolving with dimensionless time, Figure 5 is the dimensionless time evolution curve of the lateral load factor, Figure 6 is a curve diagram of the evolution of the deflection angle with the dimensionless vertical displacement, to illustrate another specific embodiment of the active ventilation, load reduction and stabilization simulation method applicable to the simultaneous launch of multiple navigation bodies out of water provided by the present invention, including:

[0075] Taking the study of the simultaneous launch of a twin-engine vehicle out of water as an example, refer to Figure 2 , D = 0.1m, aspect ratio L / D = 6, Dh =0.02D, aperture ratio S / D h =2.2;

[0076] Set the size of the computational domain to 10D×10D×4.5L, and the center distance of the twin-engine vehicle single body geometric model to 2D;

[0077] In order to control the computational cost and improve the computational efficiency while ensuring the computational accuracy, a symmetric boundary is set, that is, the 1 / 2 flow field computational domain is used to carry out the numerical simulation;

[0078] The pressure at the initial position near the orifice of the single body geometric model of the navigation body is set to 25m hydrostatic pressure;

[0079] Keep the parameters such as aperture size, number and position unchanged, and only use the ventilation flow rate as the only variable;

[0080] The background grid uses a hexahedral grid, and the boundary layer grid uses a stretched prism layer grid. The number of layers is set to 15, and the growth rate is 1.2;

[0081] Set the time step to 10-5s and the maximum time step to 10-4s;

[0082] For the flow inlet boundary conditions of the orifice, the ventilation flow rates of 0, 0.005kg / s, 0.010kg / s, 0.015kg / s, and 0.020kg / s were selected for simulation respectively;

[0083] The numerical simulation software is based on the improved delayed detached vortex model, cavitation model, multiphase flow model and grid to reasonably match the simulation results such as Figure 3 As shown, the data of each simulation is analyzed to obtain Figures 4 to 6 .

[0084] Reference Figure 3 Under the condition of no ventilation, the single body geometric model of the vehicle deflects inward by 4.1°. Under the conditions of ventilation flow rates of 0.005kg / s, 0.010kg / s, 0.015kg / s, and 0.020kg / s, the cavitation wraps the area below the ventilation hole, and the single body geometric model of the vehicle deflects inward by 3.5°, 2.7°, 2.2°, and 1.9°, respectively.

[0085] Reference Figure 4 It can be seen that the pulsation characteristics of the friction coefficient and the average friction coefficient are greatly reduced after active ventilation;

[0086] Reference Figure 5 It can be seen that the pulsation characteristics and average load coefficient of the lateral load coefficient were greatly reduced after active ventilation;

[0087] Reference Figure 6It can be seen that the maximum deflection angle after active ventilation is reduced by about 50%.

[0088] In summary, the active ventilation, load reduction and stabilization simulation method suitable for multiple navigation bodies launching out of water at the same time provided by the present invention has a good simulation effect.

[0089] It can be seen from the above embodiments that the active ventilation, load reduction and stabilization simulation method applicable to multiple navigation bodies launching out of water at the same time provided by the present invention achieves at least the following beneficial effects:

[0090] The present invention provides an active ventilation load reduction and stabilization simulation method suitable for multiple navigation bodies to be launched out of water at once. The numerical simulation software calls the physical parameters of the improved delayed detached vortex model, cavitation model, multiphase flow model, three-dimensional multi-navigation body geometric model, solver, ventilation flow rate and time step, solves the node flow field data of each grid in the calculation domain, and generates simulation results according to the node flow field data of all grids. The simulation results corresponding to different ventilation flow rates can be obtained through the numerical simulation software, so that the load reduction and stabilization effects corresponding to different ventilation flow rates can be intuitively seen, which is helpful to determine the optimal ventilation flow rate, and is of great significance to the research on underwater salvo of navigation bodies.

[0091] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An active ventilation load reduction and stabilization simulation method suitable for multiple vehicles launching out of water at the same time, characterized in that: include: The improved delayed detached eddy model, cavitation model and multiphase flow model were coupled with numerical simulation software; Establishing a three-dimensional multi-vehicle geometric model in the numerical simulation software, wherein the three-dimensional multi-vehicle geometric model is defined with a calculation domain, wherein the calculation domain includes an area where the three-dimensional multi-vehicle geometric model is located and a blank area, and generating a grid in the blank area; Setting physical parameters and solver of the three-dimensional multi-vehicle geometric model; Select ventilation flow rate and time step; The numerical simulation software calls the physical parameters of the improved delayed detached vortex model, the cavitation model, the multiphase flow model, the three-dimensional multi-vehicle geometric model, the solver, the ventilation flow rate and the time step, and solves the node flow field data of each grid in the calculation domain; and generates simulation results based on the node flow field data of all the grids.

2. The active ventilation load reduction and stabilization simulation method applicable to multiple vehicles launching out of water at the same time according to claim 1 is characterized in that: The three-dimensional multi-vehicle geometric model includes at least two vehicle monomer geometric models, and all the vehicle monomer geometric models in the three-dimensional multi-vehicle geometric model are the same; The three-dimensional multi-navigation body geometric model is defined by a Cartesian coordinate system, and all the single-unit geometric models of the navigation bodies are arranged in an array around the origin of the Cartesian coordinate system.

3. The active ventilation load reduction and stabilization simulation method applicable to multiple vehicles launching out of water at the same time according to claim 1 is characterized in that: Before generating a grid in the blank area, the method further comprises: Determining the boundary conditions of the calculation domain includes: setting the circumferential orifice boundary conditions of the calculation domain as a flow inlet, and setting the surrounding boundary conditions of the calculation domain as a pressure outlet.

4. The active ventilation load reduction and stabilization simulation method applicable to multiple vehicles launching out of water at the same time according to claim 2 is characterized in that: Generating a grid in the blank area comprises: Setting the number of boundary layer grid layers, the boundary layer grid type and the growth rate, wherein the numerical simulation software generates a boundary layer grid that wraps the geometric model of the navigation body monomer according to the number of boundary layer grid layers, the boundary layer grid type and the growth rate; Setting the background grid type, and performing grid division on the area of ​​the blank area where the boundary layer grid is not located according to the size of the boundary layer grid away from the side of the geometric model of the vehicle monomer and the background grid type, to generate a background grid; Setting an encrypted area, wherein the encrypted area penetrates the calculation domain along the extension direction of the single body geometric model of the navigation body, and the orthographic projection of the three-dimensional multi-navigation body geometric model along the extension direction of the single body geometric model of the navigation body is located within the orthographic projection range of the calculation domain along the extension direction of the single body geometric model of the navigation body; The grid in the encrypted area is encrypted.

5. The active ventilation, load reduction and stabilization simulation method applicable to multiple vehicles launching out of water at the same time according to claim 1 is characterized in that: The step of setting the physical parameters of the three-dimensional multi-vehicle geometric model comprises: Acquiring physical parameters of the navigation object, wherein the physical parameters of the navigation object include mass, center of mass and moment of inertia; The physical parameters of the navigation body are formed into a script, and the script is imported into the numerical simulation software. The numerical simulation software sets the physical parameters of the three-dimensional multi-navigation body geometric model according to the script.

6. The active ventilation load reduction and stabilization simulation method applicable to multiple vehicles launching out of water at the same time according to claim 1 is characterized in that: The solvers include a six-freedom motion solver, a separated flow solver, a separated energy solver and a turbulence solver.

7. The active ventilation load reduction and stabilization simulation method applicable to multiple vehicles launching out of water at the same time according to claim 4 is characterized in that: The boundary layer grid type is a prismatic layer grid, and the background grid type is a polyhedral grid.

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