Exhaust system pre-treatment device and method

Abstract

The present invention discloses an exhaust system pre-treatment device and method, which relates to the technical field of exhaust system, and includes: a PID processing module, a surface processing module, an orifice plate processing module and a grid processing module. The PID processing module is used to extract the calculation domain of the exhaust system geometric model, and assign PID names to the fluid domain in the calculation domain; the surface processing module is used to perform geometric repair and connection on the fluid domain, and process the geometry in the fluid domain into a correct topological relationship; the orifice plate processing module is used to simplify the geometric features of the orifice plate inside the muffler, and connect with the geometry in the fluid domain processed by the surface processing module, delete redundant faces, and obtain a clean exhaust system geometric model; the grid processing module is used to generate a CFD grid from the clean exhaust system geometric model and export it. The present invention can reduce repetitive operations, standardize the pre-processing process, and improve the efficiency of simulation work.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust systems, and in particular to an exhaust system pre-treatment device and method. Background Art

[0002] The exhaust system plays a vital role in automotive engineering. Its design and optimization directly affect vehicle performance, fuel economy, environmental emissions and noise pollution. Its main analysis projects include "flow characteristics analysis", "heat transfer analysis" and "exhaust noise analysis". The analysis process of these projects can be divided into three parts: pre-processing, simulation calculation and post-processing. The main analysis process is to first obtain a clean calculation grid through the pre-processing process and set the corresponding physical conditions and boundary conditions, then select a suitable solver to use the calculation grid for simulation analysis and calculation, and finally process the obtained simulation data through the post-processing process into visual data such as charts for easy display.

[0003] Generally speaking, pre-processing work starts after engineers get the geometric model. First, they clean up invalid geometry to extract the area where the fluid passes, that is, the computational domain. Then, they perform geometry repair to repair the erroneous surfaces. They also need to achieve the correct topology based on the connection relationship between different components. After that, they set the corresponding physical boundary conditions and PID names. Finally, they generate the computational mesh and perform quality checks based on the mesh quality requirements.

[0004] In the entire exhaust system simulation process, the pre-processing process often occupies more than 60% of the total analysis process, and the reason for taking a long time is also related to the above-mentioned pre-processing process. Engineers need to perform geometry cleaning and geometry repair on each component, and in order to improve the simulation accuracy, the grid needs to be finely divided, and more PIDs need to be set. In addition, in order to facilitate collaborative work and achieve consistency in simulation results, companies will standardize PID naming and perform standardized geometry simplification, repair, and cleaning operations on key geometric positions. There are a large number of repetitive operations in these processes, which not only take up a lot of time but are also prone to errors, which seriously affects work efficiency and delays work progress. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an exhaust system pre-treatment device and method, which can effectively reduce repetitive operations, standardize the pre-treatment process, and improve the efficiency of simulation work.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An exhaust system pre-treatment device, comprising:

[0008] A PID processing module is used to extract the calculation domain of the exhaust system geometric model and assign PID names to the fluid domain in the calculation domain; the calculation domain includes the fluid domain and the orifice plate domain; the fluid domain refers to the pipe and box part in the exhaust system geometric model, and the orifice plate domain refers to the part that needs to be identified as the orifice plate;

[0009] A surface processing module, used for geometrically repairing and connecting the fluid domain, and processing the geometry in the fluid domain into a correct topological relationship;

[0010] The orifice plate processing module is used to simplify the geometric features of the orifice plate inside the muffler, connect it with the geometry in the fluid domain processed by the surface processing module, delete redundant surfaces, and obtain a clean exhaust system geometry model;

[0011] Mesh processing module for generating CFD mesh from clean exhaust system geometry and exporting it.

[0012] To achieve the above object, the present invention also provides the following solution:

[0013] An exhaust system pre-treatment method, comprising:

[0014] Extracting the computational domain of the exhaust system geometric model, and assigning PID names to the fluid domains in the computational domain; the computational domain includes the fluid domain and the orifice plate domain; the fluid domain refers to the pipe and box parts in the exhaust system geometric model, and the orifice plate domain refers to the part that needs to be identified as the orifice plate;

[0015] Performing geometric repair and connection on the fluid domain, and processing the geometry within the fluid domain into a correct topological relationship;

[0016] Simplify the geometric features of the internal orifice plate of the muffler, connect it with the geometry in the fluid domain processed by the surface processing module, delete the redundant surfaces, and obtain a clean exhaust system geometry model;

[0017] The clean exhaust system geometry is exported as a CFD mesh.

[0018] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0019] The exhaust system pre-treatment device provided by the present invention is integrated into the ANSA page in the form of a plug-in, and a certain custom format is provided to complete the standardized input, thus avoiding the repetitive work of engineers. At the same time, it can help users to standardize, normalize and process operations, reduce manual operation errors, greatly improve work efficiency and reduce the cumbersome development process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 A block diagram of an exhaust system pre-treatment device provided in Embodiment 1 of the present invention;

[0022] Figure 2 This is a flow chart of the exhaust system pre-treatment method provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The purpose of the present invention is to provide an exhaust system pre-treatment device and method, which completes standardized input by providing a certain custom format, realizes standardization, normalization and process-based operation, and effectively reduces repetitive operations.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1

[0027] like Figure 1 As shown, the exhaust system pre-treatment device provided in this embodiment includes a PID processing module 1, a surface processing module 2, a perforated plate processing module 3 and a grid processing module 4. These four modules are arranged and classified according to the general implementation steps of the pre-treatment.

[0028] (1) PID processing module 1

[0029] The main function of the PID processing module 1 is to extract the computational domain of the exhaust system geometry model and implement the PID division of the computational domain. The computational domain represents the area through which the fluid passes. The computational domain is divided into two parts: the fluid domain and the orifice domain. The fluid domain refers to the pipe and box parts in the exhaust system geometry model, which are the main inner contours of the exhaust system. The orifice domain refers to the part that needs to be identified as the orifice geometry. In the exhaust system, it is the soundproof orifice and support rod of the muffler, which is generally located in the fluid domain and connected to the fluid domain.

[0030] In PID processing module 1, first obtain the required calculation domain through the "Extract Fluid Domain" function and "Select Orifice Plate". These two domains will be placed in an independent ANSAPART. Operations performed on the geometry in these domains will not affect the original geometry. Then execute the "Assign PID" function to assign PID names to the geometry in the fluid domain according to the specification. These PID names will also serve as identification tags to assist subsequent automated operations, such as identifying pipes by the "Pipe" character in the PID name.

[0031] like Figure 1 As shown, the PID processing module 1 includes: a fluid domain extraction unit 11, an orifice domain extraction unit 12, a PID allocation unit 13 and an inlet and outlet setting unit 14.

[0032] 1) A fluid domain extraction unit 11, which is used to extract the geometry of the inner wall surface in contact with the exhaust gas as the fluid domain.

[0033] Development purpose: To obtain the inner wall geometry in contact with the exhaust gas as the fluid domain.

[0034] Implementation method: Create a new ANSAPART named "Fluid Domain", extract the faces that are continuous with the inner wall of the component selected by the user each time and whose angle is less than 40°, copy these faces, and put them into the fluid domain part.

[0035] Beneficial effect: Manual extraction of fluid domain requires deleting unnecessary faces again and again to screen out faces representing the fluid domain, and once deleted by mistake, it is not easy to recover. The exhaust system pre-treatment device provided in this embodiment can not only retain the original geometry, but also avoid clicking each time when deleting a face, directly select the target face, and simplify the operation steps.

[0036] 2) A well plate domain extraction unit 12, which is used to extract the well plate domain.

[0037] Development purpose: obtain the orifice domain.

[0038] Implementation method: Copy the orifice plate geometry selected by the user into the "ANSAPART" marked as the orifice plate domain.

[0039] 3) PID assignment unit 13, which is used to assign the geometry within the fluid domain to a pre-defined PID name.

[0040] Development purpose: Assign the geometry within the fluid domain to a pre-defined PID name.

[0041] Implementation method: The exhaust pre-treatment system makes the current ANSA page only display the geometry within the fluid domain selected by the user, and reads the PID name of the user's preset specification to make it into a display window. There is an execution button after each PID name in the window. The user clicks the button and then selects the target surface. The exhaust pre-treatment system assigns these surfaces to the corresponding PID names.

[0042] Beneficial effects: standardizes the naming of model PID and saves operation steps.

[0043] 4) An inlet and outlet setting unit 14, which is used to set the outlet and inlet of the geometric model of the exhaust system in the fluid domain.

[0044] Development purpose: To set the outlet and inlet of the exhaust system geometric model in the fluid domain, the inlet needs to be extended a certain distance in the direction of the pipe port, and the PID names of the outlet and inlet need to be set.

[0045] Implementation method: The system automatically calculates the normal vector of the pipe mouth, and extends the pipe mouth along the vector direction according to the parameters entered by the user. Finally, the pipe mouth is closed and the inlet and outlet PID names are automatically set.

[0046] Beneficial effect: The original 3 to 5 steps required manually are simplified to 1 step.

[0047] (2) Surface processing module 2

[0048] After PID processing module 1, the geometry in the fluid domain has been classified according to the PID name, but the geometry is not closed and there are many geometric errors. This requires surface processing module 2 to repair and connect the geometry in the fluid domain and process the geometry in the fluid domain into the correct topological relationship. The main operation objects are the exhaust system pipes and muffler walls.

[0049] The surface processing module 2 can automatically traverse the errors of pipeline separation and pipeline nesting in the model, and fix the problems by automatically calculating the projection, extension direction and distance.

[0050] like Figure 1 As shown, the surface processing module 2 includes: a pipe connection unit 21, a muffler wall processing unit 22 and an Interface creation unit 23.

[0051] 1) A pipeline connection unit 21, which is used to identify the pipeline structure in the fluid domain according to the PID name and connect the identified pipelines to achieve automatic connection of the pipelines.

[0052] Development purpose: The pipeline structure before processing has common topological problems such as separation and nesting that need to be repaired.

[0053] Implementation method: Identify the pipeline structure according to the PID name, calculate the size, distance, parallel and depth relationship of each individual pipeline edge, judge it as a separation problem or a nested problem according to the rules, and perform extension or projection respectively.

[0054] Beneficial effects: It can automatically judge and handle various possibilities in the scenario, replacing the tedious work of manual visual inspection and manual repair.

[0055] 2) A muffler wall processing unit 22, which is used to clean the muffler wall in the exhaust system geometric model.

[0056] Development purpose: Before treatment, the edge of the muffler wall often has chamfered structure and interference problems, and is separated from the exhaust pipe.

[0057] Implementation method: Identify the characteristic lines of the muffler side wall in a planar state, and project them onto other wall surfaces to complete the chamfer structure cleaning; identify the free edges of the opening area, project them onto the exhaust pipe, and complete the exhaust pipe connection.

[0058] Beneficial effect: The steps that previously required manual connection and deletion of redundant faces are simplified to one step.

[0059] 6) Interface creation unit 23, which is used to generate an interface according to actual requirements and set the PID name of the interface.

[0060] Development purpose: Before processing, the data is a complete exhaust system fluid domain. In order to conveniently analyze the flow or heat transfer characteristics of different areas separately during calculation, such as the front muffler, three-way catalytic converter, exhaust tail pipe, etc., the fluid domain needs to be correctly segmented and the correct interface needs to be created between adjacent segments.

[0061] How to use: The pre-processing tool automatically identifies the boundary between adjacent PIDs and creates an interface plane based on the boundary to segment the exhaust system.

[0062] Beneficial effect: The interface that previously needed to be visually inspected and manually created can now be automatically generated with one click.

[0063] (3) Orifice plate processing module 3

[0064] After the surface processing module 2, a clean fluid domain geometry is obtained. The main function of the orifice processing module 3 is to simplify the geometry in the orifice domain, connect it with the geometry in the fluid domain, and delete redundant faces. The main purpose is to obtain a clean exhaust system geometry model. It needs to be executed after the fluid domain processing is completed, that is, after the surface processing module is completed.

[0065] In the orifice plate processing module 3, the main function is “create orifice plate”, “connect orifice plate holes” and “connect support rods” are auxiliary functions after creating the orifice plate, which are executed as needed.

[0066] like Figure 1 As shown, the orifice plate processing module 3 includes: an orifice plate creating unit 31 , an orifice plate hole connecting unit 32 and a support rod connecting unit 33 .

[0067] 1) Orifice plate creation unit, which is used to simplify the orifice plate area structure, connect it with the muffler wall and pipe, and retain the reinforcement structure according to user needs.

[0068] Development purpose: The baffle area before processing has unnecessary chamfer structures, and is in an interference or separation state with the muffler wall and pipe, and needs to be automatically processed and connected.

[0069] Implementation method: Identify the characteristic surfaces on both sides of the orifice plate, automatically retain the circular hole between the characteristic surfaces on both sides, and let the user select other features that need to be retained (such as possible reinforcement rib structures, etc.). After the tool deletes the remaining structures, the free edge surface is automatically projected onto the muffler wall and the pipeline to achieve connection.

[0070] Beneficial effects: Automatically handle common problems of orifice plates and retain human intervention for special structures, improving processing efficiency.

[0071] 2) Orifice plate hole connection unit 32, which is used to regenerate circular hole features on the orifice plate domain that were omitted in the design stage or deleted by mistake during processing.

[0072] Development purpose: To generate circular holes on the orifice plate structure.

[0073] Implementation method: According to user input, holes are opened on the orifice plate structure and a circular hole array is automatically formed.

[0074] Beneficial effect: Helps users quickly restore orifice plate features or redesign orifice plate structures.

[0075] 3) A support rod connection unit 33, which is used to connect the support rod structure to the orifice plate and the fluid domain.

[0076] Development purpose: To connect the support rod structure to the orifice plate and the fluid domain.

[0077] Implementation method: The tool finds the orifice plate connected to the support rod based on the physical distance and projects the edge onto the orifice plate; in addition, it checks whether the support rod is hollow and has a fluid domain pipe penetrating it. If so, it performs the projection connection again.

[0078] Beneficial effects: Various conditions of the support rod structure can be automatically determined, simplifying the steps of manual connection.

[0079] (4) Grid processing module

[0080] The main purpose of the mesh processing module 4 is to generate the CFD mesh of the clean exhaust system geometry model as required, perform mesh quality checks and export it.

[0081] The object of the mesh processing module 4 is all the geometries in the computational domain.

[0082] like Figure 1 As shown, the mesh processing module 4 includes: a surface mesh processing unit 41 , a mesh quality checking unit 42 and a mesh exporting unit 43 .

[0083] 1) A surface mesh processing unit 41, which is used to call batch mesh to generate a CFD mesh from the clean exhaust system geometric model according to actual mesh requirements.

[0084] Development purpose: The original data is a cleaned exhaust system geometry model. It is necessary to call batch mesh to generate CFD mesh according to the actual mesh requirements and display the mesh quality test results.

[0085] Implementation: The tool assigns different mesh sizes to each PID according to preset rules, identifies the geometric circular hole structure, refines the size, and finally generates a mesh.

[0086] Beneficial effect: Simplify the dozens of steps required originally into one step.

[0087] 2) A mesh quality check unit 42, which is used to perform quality check on the CFD mesh according to a specified quality file.

[0088] Development purpose: The original data is a CFD mesh, and the mesh quality check needs to be performed according to the built-in mesh quality specification.

[0089] Implementation method: Check the mesh quality results and output a report on the number of unqualified meshes corresponding to each indicator.

[0090] 3) A mesh export unit 43, which is used to export the CFD mesh after the quality is qualified.

[0091] Development purpose: The original data is a CFD mesh, and the mesh needs to be exported to a specified location.

[0092] Implementation method: The system calls the internal API of ansa to bring up the file selection window, and exports the mesh of the current file in "Nastran" format to the path selected by the user.

[0093] The exhaust system pre-treatment device provided in this embodiment can effectively reduce repetitive operations, standardize the pre-treatment process, and achieve the purpose of improving the efficiency of simulation work. The system can quickly extract the calculation domain geometry and quickly repair and clean up the calculation domain geometry; can quickly and standardizedly realize the naming and allocation of PIDs; can semi-automatically realize the connection between different PIDs and establish a unified connection topology; can also automatically generate the calculation grid, check the grid quality and export it.

[0094] Embodiment 2

[0095] With respect to the exhaust system pre-treatment device provided in the first embodiment, this embodiment provides an exhaust system pre-treatment method, such as Figure 2 As shown, the method includes:

[0096] S1: Extract the computational domain of the exhaust system geometry model, and assign PID names to the fluid domains in the computational domain; the computational domain includes the fluid domain and the orifice domain; the fluid domain refers to the pipe and box parts in the exhaust system geometry model, and the orifice domain refers to the part that needs to be identified as the orifice. Specifically, it includes: extracting the inner wall surface in contact with the exhaust gas as the fluid domain; extracting the orifice domain; assigning the geometry in the fluid domain to a pre-defined PID name; setting the outlet and inlet of the exhaust system geometry model in the fluid domain.

[0097] S2: Perform geometric repair and connection on the fluid domain, and process the geometry in the fluid domain into the correct topological relationship. Specifically, it includes: identifying the pipes in the fluid domain according to the PID name, and connecting the identified pipes; connecting the unidentified pipes; generating the outer wall according to the actual thickness of the pipe, and establishing the correct topological relationship between the outer wall and the pipe shell to generate a double-layer pipe; generating the outer wall according to the actual thickness of the pipe, and establishing the correct topological relationship between the outer wall and the inner wall of the pipe to generate an independent double-layer pipe; connecting the two ends of the muffler box in the exhaust system geometry model to the barrel body; generating the interface surface according to actual requirements, and setting the PID name of the interface surface.

[0098] S3: Simplify the geometric features of the orifice plate inside the muffler, connect it with the geometry in the fluid domain processed by the surface processing module, delete redundant faces, and obtain a clean exhaust system geometry model. Specifically, it includes: processing the orifice plate area into a double-layer orifice plate, connecting it with the muffler wall and pipe, retaining the reinforcing rib structure; generating the hole connection surface between the two orifice plate geometries, connecting the two orifice plate geometries, and removing redundant faces; generating the correct topological relationship between the crossbar and the orifice plate, and between the crossbar and the fluid domain.

[0099] S4: Generate CFD mesh from the clean exhaust system geometry model and export it. Specifically, it includes: calling batch mesh to generate CFD mesh from the clean exhaust system geometry model according to the actual mesh requirements; performing quality inspection on the CFD mesh according to the specified quality file; and exporting the CFD mesh after the quality is qualified.

[0100] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An exhaust system pre-treatment device, characterized in that: include: A PID processing module is used to extract the calculation domain of the exhaust system geometric model and assign PID names to the fluid domain in the calculation domain; the calculation domain includes the fluid domain and the orifice plate domain; the fluid domain refers to the pipe and box part in the exhaust system geometric model, and the orifice plate domain refers to the part that needs to be identified as the orifice plate; A surface processing module, used for geometrically repairing and connecting the fluid domain, and processing the geometry in the fluid domain into a correct topological relationship; The orifice plate processing module is used to simplify the geometric features of the orifice plate inside the muffler, connect it with the geometry in the fluid domain processed by the surface processing module, delete redundant surfaces, and obtain a clean exhaust system geometry model; Mesh processing module for generating CFD mesh from clean exhaust system geometry and exporting it.

2. The exhaust system pre-treatment device according to claim 1, characterized in that: The PID module specifically includes: A fluid domain extraction unit, used for extracting the inner wall surface in contact with the exhaust gas as a fluid domain; A well plate domain extraction unit, used for extracting the well plate domain; PID assignment unit, used to assign the geometry within the fluid domain to a pre-defined PID name; The inlet and outlet setting unit is used to set the outlet and inlet of the exhaust system geometric model in the fluid domain.

3. The exhaust system pre-treatment device according to claim 1, characterized in that: The surface processing module specifically includes: A pipeline connection unit is used to identify pipelines in the fluid domain according to PID names and connect the identified pipelines; A muffler wall processing unit is used to clean the muffler wall in the exhaust system geometry model; The interface creation unit is used to generate an interface according to actual requirements and set the PID name of the interface.

4. The exhaust system pre-treatment device according to claim 1, characterized in that: The orifice plate processing module specifically includes: Orifice plate creation unit is used to simplify the orifice plate area structure and connect it with the muffler wall and pipe, and retain the reinforcement structure; Orifice plate hole connection unit, used to regenerate circular hole features on the orifice plate domain that were omitted during the design stage or mistakenly deleted during processing; The support rod connection unit is used to connect the support rod structure to the orifice plate and the fluid domain.

5. The exhaust system pre-treatment device according to claim 1, characterized in that: The grid processing module specifically includes: The surface mesh processing unit is used to generate CFD mesh from the clean exhaust system geometry model by calling batchmesh according to the actual mesh requirements; Mesh quality check unit, used to check the quality of CFD mesh according to the specified quality file; The mesh export unit is used to export the CFD mesh after the quality is qualified.

6. An exhaust system pre-treatment method, characterized in that: include: Extracting the computational domain of the exhaust system geometric model, and assigning PID names to the fluid domains in the computational domain; the computational domain includes the fluid domain and the orifice plate domain; the fluid domain refers to the pipe and box parts in the exhaust system geometric model, and the orifice plate domain refers to the part that needs to be identified as the orifice plate; Performing geometric repair and connection on the fluid domain, and processing the geometry within the fluid domain into a correct topological relationship; Simplify the geometric features of the internal orifice plate of the muffler, connect it with the geometry in the fluid domain processed by the surface processing module, delete the redundant surfaces, and obtain a clean exhaust system geometry model; The clean exhaust system geometry is exported as a CFD mesh.

7. The exhaust system pre-treatment method according to claim 6, characterized in that: Extract the computational domain of the exhaust system geometric model and assign PID names to the fluid domains in the computational domain, specifically including: The inner wall surface in contact with the exhaust gas is extracted as the fluid domain; Extract the well plate domain; Assign the geometry within the fluid domain to a pre-defined PID name; Set up the inlet and outlet of the exhaust system geometry within the fluid domain.

8. The exhaust system pre-treatment method according to claim 6, characterized in that: The fluid domain is geometrically repaired and connected, and the geometry in the fluid domain is processed into a correct topological relationship, specifically including: Identify the pipes in the fluid domain according to the PID name and connect the identified pipes; Clean up the muffler wall in the exhaust system geometry model; Generate an interface according to actual requirements and set the PID name of the interface.

9. The exhaust system pre-treatment method according to claim 6, characterized in that: Simplify the geometric features of the internal orifice plate of the muffler, connect it with the geometry in the fluid domain processed by the surface processing module, delete the redundant surfaces, and obtain a clean exhaust system geometry model, including: The orifice plate area is processed into a double-layer orifice plate and connected with the muffler wall and the pipe, and the reinforcing rib structure is retained; Generate the hole connection surface between the two orifice plate geometries, connect the two orifice plate geometries, and remove the redundant surfaces; Establish the correct connection between the support rod and the adjacent orifice plate.

10. The exhaust system pre-treatment method according to claim 6, characterized in that: Generate and export the clean geometry into a computational CFD mesh, including: Call batch mesh to generate CFD mesh from the clean exhaust system geometry model according to the actual mesh requirements; Perform quality check on CFD mesh according to the specified quality documents; Export the CFD mesh after it reaches the required quality.

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