A method and system for simulating and modeling thermal distribution of multi-task loading tanks in autoclaves

Abstract

The present invention discloses a method and system for simulating and modeling the thermal distribution of a multi-stage autoclave tank. The method includes performing overall three-dimensional modeling to obtain a parent model; dividing the geometric model of the multi-stage autoclave tank to obtain a plurality of sub-partitions after division; performing three-dimensional modeling on each sub-partition to obtain a plurality of sub-models; meshing the parent model; meshing the sub-models; importing the meshed parent model into finite element simulation software to obtain the flow field results of the parent model; obtaining the velocity vector and static pressure of each sub-model division interface according to the flow field results of the parent model; for each sub-model, importing the meshed sub-model and the velocity vector and static pressure corresponding to the sub-model division interface into finite element simulation software to obtain the flow field results of the sub-model; and then obtaining the temperature field of each sub-model. The solution provided by the present invention can greatly reduce the difficulty of processing the overall flow field and temperature field.

Description

Technical Field

[0001] The invention relates to the technical field of creep aging forming of autoclaves, and in particular to a thermal distribution simulation modeling method and system for multi-task loading in autoclaves. Background Art

[0002] An autoclave is a workpiece forming equipment that integrates high temperature and high pressure. The pressure and temperature inside the autoclave are uniform and controllable. The workpiece is heated by circulating hot air flow. It has the advantages of a wide range of applications and uniform heating of the workpiece. Therefore, the creep aging forming technology of autoclaves has been widely used in the aerospace field. Due to the high cost of experimental research on autoclaves and the continuous development of computer performance and simulation software, it is increasingly important to study the thermal distribution characteristics of different workpieces in autoclaves, especially multi-workpiece loading tanks, through simulation methods. However, the pain points of low modeling and calculation efficiency caused by the coupling of multiple physical fields in the thermal distribution simulation of multi-workpiece loading tanks and the huge number of grids caused by the large size span of the autoclave and the workpiece need to be solved urgently. Summary of the invention

[0003] In order to solve the technical problems of low modeling and calculation efficiency caused by multi-physical field coupling and huge number of grids in the thermal distribution simulation of multi-stage loading tanks in autoclaves, an embodiment of the present invention provides a thermal distribution simulation modeling method and system for multi-stage loading tanks in autoclaves.

[0004] The technical solution of the embodiment of the present invention is achieved as follows:

[0005] The embodiment of the present invention provides a method for simulating and modeling the thermal distribution of a multi-tool loading tank in an autoclave, the method comprising: performing overall three-dimensional modeling on a geometric model of a multi-tool loading tank in an autoclave to obtain a master model; dividing the geometric model of the multi-tool loading tank in an autoclave according to the number of multi-tools in the autoclave and the placement positions of the multi-tools in the autoclave to obtain a plurality of sub-divisions after division; performing three-dimensional modeling on each of the sub-divisions to obtain a plurality of sub-models; and performing meshing on the master model according to the principle of not meshing the tooling area in the master model and meshing the fluid area in the master model except the tooling area. The method comprises the steps of: meshing the mother model; meshing the mother model according to the principle of meshing all regions of the mother model; importing the meshed mother model into finite element simulation software to obtain the flow field result of the mother model; obtaining the velocity vector and static pressure of each sub-model division interface according to the flow field result of the mother model; for each sub-model, importing the meshed mother model and the velocity vector and static pressure corresponding to the sub-model division interface into finite element simulation software to obtain the flow field result of the sub-model; and performing simulation according to the flow field result of each sub-model to obtain the temperature field of each sub-model.

[0006] In one embodiment, the geometric model of the autoclave multi-tool tank is divided, including: taking a plane perpendicular to the wall of the mother model as a cutting plane, and dividing based on the principle that each sub-division contains the least number of tools.

[0007] In one embodiment, meshing the mother model includes: meshing the fluid area of ​​the mother model with a first mesh size that is one-tenth of the size of the mother model based on the geometric shape of the mother model; meshing the child model includes: meshing the tooling area of ​​the child model with a second mesh size that is one-tenth of the tooling size based on the actual geometric shape of the tooling, meshing the nearby fluid area within a preset range of the tooling area of ​​the child model with a third mesh size that is between the first mesh size and the second mesh size; and meshing other fluid areas of the child model except the nearby fluid area with the first mesh size.

[0008] In one embodiment, according to the flow field results of the parent model, the velocity vector and static pressure of each sub-model dividing interface are obtained, including: according to the flow direction of the fluid in the autoclave, the velocity vector and static pressure of each dividing interface are used as the initial values ​​of the inlet and outlet boundary conditions of the sub-model corresponding to the dividing interface.

[0009] In one embodiment, meshing the mother model includes: importing the mother model into meshing software, performing a topological check on the mother model, and naming the entrance, exit, and wall of the mother model after confirming that they are correct; creating blocks according to the shape of the mother model; dividing the created blocks according to the geometric structure of the tooling, and dividing the entire mother model into several blocks; for areas that do not need to be meshed, deleting the existing blocks corresponding to the areas, and associating the points and lines of the mother model; generating a mesh according to the set parameters, and adjusting and optimizing the mesh; using the mesh quality inspection tool provided by the meshing software to perform quality assessment; after the quality assessment is qualified, converting the generated mesh into an unstructured mesh and exporting it to a file in the first format.

[0010] In one embodiment, the sub-model is meshed, including: importing the sub-model into meshing software, performing a topological check on the sub-model, and naming the inlet, outlet, and wall of the sub-model after confirming that they are correct; creating a block according to the shape of the sub-model; dividing the created block according to the geometric structure of the tooling, and associating the points and lines of the sub-model; generating a mesh according to the set parameters, and adjusting and optimizing the mesh; dividing the tooling area, nearby fluid area, and other fluid areas of the sub-model with mesh sizes of different sizes; using the mesh quality inspection tool provided by the meshing software to perform quality assessment; after the quality assessment is qualified, converting the generated mesh into an unstructured mesh and exporting it to a file in a first format.

[0011] In one embodiment, the meshed mother model is imported into finite element simulation software to obtain the flow field result of the mother model, including: importing the meshed mother model into finite element simulation software, setting the corresponding physical model, material properties, boundary conditions and solution method in the software, and then calculating the flow field of the mother model; wherein the inlet and outlet boundary conditions of the mother model autoclave are respectively set as velocity inlet and pressure outlet boundary conditions, and the wall surface is set as a stationary wall surface.

[0012] In one embodiment, for each sub-model, the sub-model after meshing and the velocity vector and static pressure corresponding to the sub-model partitioning interface are imported into finite element simulation software to obtain the flow field result of the sub-model, including: importing each sub-model after meshing into finite element simulation software, setting the inlet and outlet boundary conditions of all sub-models as velocity inlet and pressure outlet boundary conditions; assigning the velocity vector and static pressure corresponding to the sub-model partitioning interface to the corresponding sub-model as the inlet and outlet initial boundary conditions; setting the remaining simulation parameters, and after the setting is completed, calculating the flow field of the sub-model.

[0013] An embodiment of the present invention also provides a thermal distribution simulation modeling system for an autoclave multi-loading tank, comprising: a processor and a memory for storing a computer program that can be run on the processor; wherein the processor executes the steps of the above-mentioned method when running the computer program.

[0014] This embodiment has the following beneficial effects:

[0015] This embodiment is based on the weak coupling of the finite element simulation model and the discrete modeling of physical partitions, divides the parent model into multiple sub-models, uses the sub-models to perform finite element simulation, and obtains the flow field and temperature field data of the corresponding tooling in the sub-model. Since the number of grids in the sub-model is greatly reduced compared to the parent model, the difficulty of the finite element simulation technology and the equipment calculation requirements can be greatly reduced, and the efficiency of the finite element simulation calculation can be improved. And when it is necessary to find the flow field and temperature field data of a certain tooling, it is only necessary to find the flow field and temperature field data of the sub-model where the tooling is located, which is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for simulating and modeling thermal distribution of a multi-task loading tank in an autoclave according to an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of an application flow of a modeling method according to an embodiment of the present invention;

[0018] Figure 3 A schematic diagram for providing supplementary explanation of the initial conditions of the sub-model of the embodiment of the present invention;

[0019] Figure 4 Schematic diagram of the geometric model of an embodiment of the present invention; wherein, Figure 4 (a) is a schematic diagram of the parent model; Figure 4 (b) is a schematic diagram of sub-model 2; Figure 4 (c) is a schematic diagram of sub-model 1;

[0020] Figure 5 This is a schematic diagram comparing the temperature data of the traditional modeling method simulation of the embodiment of the present invention and the method of this embodiment; wherein, Figure 5 (a) is a schematic diagram comparing the geometric center temperature data of tooling 13 simulated by the traditional modeling method and the method of this embodiment; Figure 5 (b) is a schematic diagram comparing the geometric center temperature data of tooling 15 simulated by the traditional modeling method and the method of this embodiment;

[0021] Figure 6 1 is a diagram showing the internal structure of a computer device according to an embodiment of the present invention.

[0022] Description of Reference Numerals

[0023] 11 is the inlet of the autoclave and the inlet of the sub-model 1 in the parent model; 12 is the front half wall of the autoclave and the wall of the sub-model 1 in the parent model; 13 is a tooling near the inlet of the autoclave and the tooling of the sub-model 1 in the parent model; 14 is the section dividing the sub-model 1 and the sub-model 2, the outlet of the sub-model 1 and the inlet of the sub-model 2 in the parent model; 15 is the tooling near the outlet of the autoclave and the tooling in the sub-model 2 in the parent model; 16 is the rear half wall of the autoclave and the wall of the sub-model 2 in the parent model; 17 is the outlet of the autoclave and the sub-model 2 in the parent model. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0025] The embodiment of the present invention provides a method for simulating and modeling the thermal distribution of a multi-task loading tank in an autoclave, such as Figure 1 As shown, the method includes:

[0026] Step 101: Performing overall three-dimensional modeling on the geometric model of the autoclave multi-tasking tank to obtain a master model;

[0027] Step 102: dividing the geometric model of the autoclave multi-tool tank according to the number of multi-tools in the autoclave and the placement positions of the multi-tools in the autoclave to obtain a plurality of sub-divisions after the division;

[0028] Step 103: Perform three-dimensional modeling on each of the sub-regions to obtain multiple sub-models;

[0029] Step 104: Meshing the parent model according to the principle that the tooling area in the parent model is not meshed and the fluid area other than the tooling area in the parent model is meshed; meshing the child model according to the principle that all areas of the child model are meshed;

[0030] Step 105: importing the meshed mother model into finite element simulation software to obtain the flow field result of the mother model;

[0031] Step 106: Obtain the velocity vector and static pressure of each sub-model dividing interface according to the flow field result of the parent model;

[0032] Step 107: For each sub-model, the sub-model after meshing and the velocity vector and static pressure corresponding to the sub-model division interface are imported into finite element simulation software to obtain the flow field result of the sub-model;

[0033] Step 108: Perform simulation according to the flow field results of each sub-model to obtain the temperature field of each sub-model.

[0034] This embodiment proposes a simulation modeling method for thermal distribution of multi-task loading tanks in an autoclave based on Fluent finite element simulation software. The core idea of ​​this embodiment is the weak coupling of finite element simulation model and physical partition discrete modeling. That is, for the flow field modeling of the overall geometric model, a high-precision steady-state flow field is obtained. Then, based on the steady-state flow field results, the autoclave is partitioned and discretely simulated to obtain a temperature field that takes into account both calculation accuracy and efficiency.

[0035] Specifically, see Figure 2, the method of this embodiment includes:

[0036] Step 1, geometric model establishment and physical partitioning: Three-dimensional modeling is performed on the geometric model of the autoclave multi-tool loading tank to obtain an overall three-dimensional model. For the convenience of description, the overall geometric model is referred to as the mother model in this embodiment. Then the mother model is divided into several sub-models. Combined with the actual working conditions, reasonable physical partitioning is performed according to the number of multiple tooling and the placement position in the tank. The specific partitioning situation needs to be determined according to the actual number, position and geometric structure characteristics of the tooling placement (here, the division principle is to use the plane perpendicular to the wall of the mother model as the cutting surface, and each sub-partition contains the least number of tooling as the principle for division). It is necessary to divide the wall of the mother model circumferentially, and also establish a corresponding three-dimensional model for the partition result. One partition can obtain a sub-model, and the sub-model is numbered accordingly. It should be noted that the sub-model should be kept in the same coordinate system as the mother model.

[0037] Step 2, meshing: Import the parent model and child model obtained in step 1 into professional meshing software for meshing. It is worth noting that for the parent model, only the mesh of the flow field area needs to be divided, and the entity mesh of the tooling part can be omitted, which can greatly reduce the number of meshes in the parent model. For the child model, both the fluid area (the space area in the autoclave is the fluid area where the airflow flows) and the entity of the tooling part need to be meshed.

[0038] During division, for the mother model, the fluid area of ​​the mother model can be gridded with a first grid size of one tenth of the mother model size in combination with the actual geometric shape of the mother model; for the child model, the tooling area of ​​the child model can be gridded with a second grid size of one tenth of the tooling size in combination with the actual geometric shape of the tooling, and the nearby fluid area within a preset range of the tooling area of ​​the child model can be gridded with a third grid size whose size is between the first grid size and the second grid size; and the other fluid areas of the child model except the nearby fluid areas can be gridded with the first grid size.

[0039] Compared with the parent model, the geometric complexity of the sub-model is significantly reduced, so the mesh quality of the sub-model is guaranteed, and the accuracy of the subsequent simulation solution of each sub-model is guaranteed.

[0040] In addition, if the sub-models obtained by physical partitioning are consistent with two or more three-dimensional models, only one of the sub-models needs to be meshed, and the remaining sub-models can reuse the mesh and only need to be numbered to distinguish them.

[0041] Step 3, calculation of the overall flow field results: import the divided mother model grid into the finite element simulation software Fluent, set the corresponding physical model, material properties, boundary conditions and solution method in the software to calculate the flow field of the mother model. It should be noted that in this embodiment, the inlet and outlet of the mother model autoclave are set as velocity inlet and pressure outlet boundary conditions respectively, and the wall surface is set as a stationary wall surface.

[0042] Step 4, extracting the overall flow field data: Based on the flow field results of the parent model, the flow field data of any cross section can be extracted and exported in the form of a Profile file in the Fluent software. In this embodiment, two key data, the velocity vector and the static pressure, of the cross section where the physical division is located need to be extracted.

[0043] Step 5, assigning initial conditions to the sub-model: Open the Fluent software and import a single sub-model grid file, where the inlets and outlets of all sub-models are set as velocity inlet and pressure outlet boundary conditions. According to the flow field data of the physically divided sub-model section obtained in step 4, assign the corresponding sub-model in the form of a Profile file as its initial boundary condition.

[0044] Here, according to the flow direction of the fluid in the autoclave, the velocity vector and static pressure of each dividing interface can be set as the outlet boundary conditions for the fluid to flow out of the dividing interface submodel and the inlet boundary conditions for the fluid to flow into the dividing interface submodel. Figure 3 .by Figure 3 Taking the middle section 1 as an example, the velocity vector and pressure data of the physically divided section 1 are extracted, the pressure data of section 1 is assigned to the outlet of sub-model 1, and the velocity vector data is assigned to the inlet of sub-model 2, which are respectively set as the corresponding initial boundary conditions of the sub-models.

[0045] Step 6, sub-model flow field and temperature field calculation: Set the remaining simulation parameters of the sub-model based on step 5. After the simulation parameters are set, the calculation can be submitted. First, the flow field results of the sub-model are obtained, and then the temperature field of the sub-model is obtained based on the flow field results. It is worth noting that since the autoclave has the characteristic of uniform temperature, the inlet temperature boundary conditions of each sub-model are set according to the autoclave forming process temperature, without considering the temperature difference of different sections. The specific sub-model calculation can be performed simultaneously on multiple sub-models according to the complexity of the sub-model and the performance of the computer.

[0046] Through the above method, this embodiment can at least achieve the following beneficial effects:

[0047] 1. In terms of pre-processing, the difficulty of overall flow field pre-processing is greatly reduced. There is no need to match the thin-wall unit size of the workpiece. The number of regional grids is greatly reduced and the quality is guaranteed, and the requirements for the graphics card are not high.

[0048] 2. In terms of calculation and solution, the overall flow field calculation converges quickly, the regional heat distribution calculation efficiency is high, and a general workstation can perform multiple sub-model calculations at the same time.

[0049] 3. In terms of post-processing, regional post-processing does not require high graphics cards, and numbering each sub-model is also conducive to analysis and query.

[0050] The present solution will be described in detail below using an application example.

[0051] This embodiment provides a method for simulating and modeling the thermal distribution of a multi-stage autoclave. Figure 4 , Figure 4 (a) is a geometric model of a hot-press tank including two toolings 13 and 15. This embodiment is described in detail based on the geometric model. The steps of this embodiment are as follows:

[0052] Step 1: Geometric model establishment and physical partitioning: In this embodiment, the Figure 4 (a) shows a master model of the autoclave multi-tool loading tank including tooling 13 and tooling 15, and then the sub-model 1 and sub-model 2 are obtained by physically dividing the cross section 14 between tooling 13 and tooling 15, corresponding to Figure 4 (c) and Figure 4 (b) as shown.

[0053] Step 2, meshing: Use ICEM meshing software to mesh the parent model and the two child models. Since the geometric model of this example is relatively simple, hexahedral meshing is used for meshing. The solid meshes of tooling 13 and tooling 15 in the parent model can be omitted, and only the mesh of the fluid area needs to be divided, but the mesh of the fluid area of ​​the child model and the solid meshes of tooling 13 and tooling 15 must be divided.

[0054] The specific meshing process is as follows: (1) Import the 3D model into ICEM, perform a topological check on the geometric model, and name the inlet, outlet, and wall of the geometric model after confirming that it is correct; (2) Create a block according to the shape of the geometric model, and the created block will serve as the basis for meshing; (3) Divide the created block according to the geometric structure of the tooling, and divide the entire geometric model into several blocks. The existing blocks need to be deleted in the area that does not need to be meshed, and then associate the points and lines of the geometric model; (4) Generate a mesh according to the set parameters, and adjust and optimize the mesh. In order to obtain accurate flow field results, the mesh near the tooling is encrypted, and the mesh size near the tooling is given between the mesh size of the tooling and the fluid area; (5) Use the mesh quality inspection tool provided by ICEM to evaluate the quality. In this example, the mesh quality is above 0.9, which fully meets the simulation calculation requirements; (6) Convert the generated mesh into an unstructured mesh and export it as a .msh type file. In this example, the number of grids in the parent model is 1.24 million, the number of grids in sub-model 1 is 0.62 million, and the number of grids in sub-model 2 is 0.7 million.

[0055] Step 3. Calculation of overall flow field results: Import the mesh file of the parent model into Fluent. The flow field characteristics in the autoclave are generally turbulent, so the Standard k-ε physical model is selected. In this example, the fluid medium in the tank is nitrogen, and the materials of tooling 13 and tooling 15 are aluminum, and their material properties are obtained through the material library provided by Fluent. Inlet 11 is set as the velocity inlet boundary condition, and the inlet velocity is 3m / s. Outlet 17 is set as the pressure outlet boundary condition, and the pressure is 0.6MPa. Standard initialization is used, and the solution method is set by default.

[0056] Step 4: Extract the overall flow field data: According to the flow field results of the parent model, extract Figure 4 (a) The velocity vector and pressure data of section 14 are exported as a Profile file in Fluent software.

[0057] Step 5. Assign initial conditions to the submodels: Open the Fluent software and import the mesh files of submodels 1 and 2 respectively. Assign the pressure data of section 14 obtained in step 4 to the outlet of submodel 1 as the pressure setting of its pressure outlet boundary condition; assign the velocity vector data of section 14 to the inlet of submodel 2 as the velocity setting of its velocity inlet boundary condition.

[0058] Step 6, calculation of sub-model flow field and temperature field: on the basis of step 5, set the rest of the simulation parameters of the sub-model. The fluid in the sub-model is also set to nitrogen, and the rest of the settings are consistent with the parent model to solve the flow field of each sub-model. Then, on the basis of the sub-model flow field, relevant parameters are set to solve the temperature field. It is worth noting that since the autoclave has the characteristic of uniform temperature, the inlet temperature boundary conditions of each sub-model are set according to the autoclave forming process temperature, without considering the temperature difference of different sections. Since the autoclave creep aging forming process has a heating stage, the temperature in the solid tank will change with time. This example sets the relationship between the fluid temperature in the given velocity inlet tank and time in the form of udf. The thermophysical parameters of nitrogen and aluminum are set according to the values ​​of the Fluent database. Each sub-model is calculated separately to obtain the flow field and temperature field simulation results of each sub-model. This example simulates the heating process of a certain autoclave for 1 hour, and exports the simulated temperature field results every 5 minutes, so a total of 12 sets of temperature data can be obtained.

[0059] Based on the above steps, the thermal distribution simulation of the multi-task loading tank in this example can be realized. In order to verify the effectiveness and accuracy of the method of the present invention, the traditional modeling simulation is compared with the method of the present invention. The traditional modeling simulation refers to the addition of Figure 4 All the geometric models in (a) are meshed, that is, the fluid area of ​​the autoclave and the solid meshes of tooling 13 and tooling 15 are meshed, and hexahedral meshes are also used for meshing, and the steps of meshing are the same as above. Then the entire mesh file is imported into the Fluent software, and the flow field results are also calculated first. On the basis of the flow field results, the settings are added to calculate the temperature field. The settings of the simulation related parameters are all consistent with this example. Finally, the temperature data of the tooling obtained by the two methods are compared and analyzed. The specific comparison method is: extract the temperature data of the two geometric center points of tooling 13 and tooling 15 in the traditional modeling simulation, and compare them with the temperature data of the geometric center points of tooling 13 in sub-model 1 and tooling 15 in sub-model 2 of the method of this embodiment. See the attached Figure 5 The temperature data curves obtained by the two modeling methods are highly consistent, and the maximum temperature difference does not exceed 1°C, thus verifying the effectiveness and accuracy of the method of this embodiment.

[0060] In order to implement the method of an embodiment of the present invention, an embodiment of the present invention also provides a thermal distribution simulation modeling system for an autoclave multi-loading tank, comprising: a processor and a memory for storing a computer program that can be run on the processor; wherein the processor is used to execute the steps of the above-mentioned method when running the computer program.

[0061] The above-mentioned system provided in this embodiment belongs to the same concept as the above-mentioned method embodiment. The specific implementation process thereof is detailed in the method embodiment and will not be repeated here.

[0062] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0063] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for simulating and modeling thermal distribution of multi-task loading tanks in an autoclave, characterized in that: The method comprises: Carry out overall 3D modeling of the geometric model of the autoclave multi-tasking tank to obtain the master model; According to the number of multi-tools in the autoclave and the placement positions of the multi-tools in the autoclave, a geometric model of the autoclave multi-tool entry tank is divided to obtain a plurality of sub-divisions after the division; Performing three-dimensional modeling on each of the sub-regions to obtain a plurality of sub-models; According to the principle of not meshing the tooling area in the mother model and meshing the fluid area other than the tooling area in the mother model, the mother model is meshed; according to the principle of meshing all areas of the child model, the child model is meshed; Importing the meshed mother model into finite element simulation software to obtain the flow field results of the mother model; According to the flow field results of the parent model, the velocity vector and static pressure of each sub-model dividing interface are obtained; For each sub-model, the sub-model after meshing and the velocity vector and static pressure corresponding to the sub-model division interface are imported into finite element simulation software to obtain the flow field result of the sub-model; Perform simulation according to the flow field results of each sub-model to obtain the temperature field of each sub-model; The geometric model of the autoclave multi-tasking tank is divided into: The plane perpendicular to the wall of the mother model is used as the cutting plane, and the division is carried out based on the principle that each sub-division contains the least number of tooling.

2. The method for simulating and modeling thermal distribution of autoclave multi-task loading tanks according to claim 1, characterized in that: Meshing the mother model includes: Based on the geometric shape of the mother model, meshing the fluid region of the mother model with a first mesh size of one tenth of the size of the mother model; The gridding of the sub-model comprises: Based on the actual geometric shape of the tooling, the tooling area of ​​the sub-model is meshed with a second mesh size that is one-tenth of the tooling size; the nearby fluid area within a preset range of the tooling area of ​​the sub-model is meshed with a third mesh size that is between the first mesh size and the second mesh size; and the other fluid areas of the sub-model except the nearby fluid area are meshed with the first mesh size.

3. The method for simulating and modeling thermal distribution of autoclave multi-task loading tanks according to claim 1, characterized in that: According to the flow field results of the parent model, the velocity vector and static pressure of each sub-model division interface are obtained, including: According to the flow direction of the fluid in the autoclave, the velocity vector and static pressure of each dividing interface are used as the initial values ​​of the inlet and outlet boundary conditions of the sub-model corresponding to the dividing interface.

4. The method for simulating and modeling thermal distribution of autoclave multi-task loading tanks according to claim 1, characterized in that: Meshing the mother model includes: Import the mother model into the meshing software, perform a topological check on the mother model, and after confirming that there are no errors, name the inlet, outlet and wall of the mother model; Create blocks according to the shape of the parent model; According to the geometric structure of the tooling, the created blocks are divided, and the entire mother model is divided into several blocks; for the area that does not need to be meshed, the corresponding existing blocks of the area are deleted, and the points and lines of the mother model are associated; Generate a mesh according to the set parameters, and adjust and optimize the mesh; The mesh quality check tool provided by the meshing software is used to perform quality assessment; after the quality assessment is qualified, the generated mesh is converted into an unstructured mesh and exported to a file in the first format.

5. The method for simulating and modeling thermal distribution of autoclave multi-task loading tanks according to claim 1, characterized in that: Meshing the sub-model includes: Import the sub-model into the meshing software, perform a topological check on the sub-model, and after confirming that the sub-model is correct, name the inlet, outlet and wall of the sub-model; Create blocks according to the shape of the sub-model; According to the geometric structure of the tooling, the created blocks are divided and the points and lines of the sub-models are associated; Generate a grid according to the set parameters, and adjust and optimize the grid; divide the tooling area, nearby fluid area and other fluid areas of the sub-model into grids of different sizes; The mesh quality check tool provided by the meshing software is used to perform quality assessment; after the quality assessment is qualified, the generated mesh is converted into an unstructured mesh and exported to a file in the first format.

6. The method for simulating and modeling thermal distribution of autoclave multi-task loading tanks according to claim 1, characterized in that: The meshed mother model is imported into finite element simulation software to obtain the flow field results of the mother model, including: The meshed mother model is imported into the finite element simulation software, and after the corresponding physical model, material properties, boundary conditions and solution methods are set in the software, the flow field of the mother model is calculated; wherein, the inlet and outlet boundary conditions of the mother model autoclave are respectively set as velocity inlet and pressure outlet boundary conditions, and the wall surface is set as a stationary wall surface.

7. The method for simulating and modeling thermal distribution of autoclave multi-task loading tanks according to claim 1, characterized in that: For each sub-model, the sub-model after meshing and the velocity vector and static pressure corresponding to the sub-model division interface are imported into the finite element simulation software to obtain the flow field results of the sub-model, including: Importing each of the sub-models after meshing into finite element simulation software, and setting the inlet and outlet boundary conditions of all sub-models as velocity inlet and pressure outlet boundary conditions; The velocity vector and static pressure corresponding to the sub-model division interface are assigned to the corresponding sub-model as the inlet and outlet initial boundary conditions; Set the remaining simulation parameters. After the settings are completed, calculate the flow field of the sub-model.

8. A thermal distribution simulation modeling system for autoclave multi-task loading tanks, characterized in that: include: A processor and a memory for storing a computer program that can be run on the processor; wherein, when the processor is used to run the computer program, the steps of the method according to any one of claims 1 to 7 are executed.

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