Engine air passage simulation calculation method and device, electronic equipment and storage medium

Abstract

This application relates to the field of engine air intake design and fluid simulation technology, and discloses an engine air intake simulation calculation method, device, electronic device, and storage medium. The method includes: constructing a three-dimensional model of the engine air intake; performing a meshing operation on the three-dimensional model of the air intake based on a preset meshing strategy to obtain an integrated mesh model; determining the set boundaries of the integrated mesh model according to the actual working medium of the engine air intake and steady-flow test conditions; defining valve lift variable parameters, and completing the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundaries. In this embodiment of the invention, valve lift is defined as a variable (i.e., valve lift variable parameters), which enables batch simulation calculations to be performed directly for different lifts based on the same integrated mesh model, without the need for repeated configuration of boundaries and parameters. This achieves efficient coverage of the entire valve lift range, which is beneficial for improving R&D efficiency and simulation calculation accuracy.

Description

Technical Field

[0001] This invention relates to the field of engine air passage design and fluid simulation technology, and in particular to an engine air passage simulation calculation method, device, electronic equipment and storage medium. Background Technology

[0002] As a core component of the intake and exhaust system of an internal combustion engine, the engine intake manifold directly determines the quality of the in-cylinder mixture, combustion efficiency, and overall engine power economy and emissions performance through its flow capacity and airflow organization characteristics. Valve lift is a key parameter for controlling the intake manifold cross-section, airflow velocity, and flow rate. Under different valve lifts, core indicators such as the flow field distribution, vortex / tumble intensity, flow coefficient, and pressure loss within the intake manifold vary significantly. Therefore, accurately obtaining intake manifold performance data across the entire lift range is a crucial prerequisite for intake manifold structure optimization and the matching design of variable valve timing mechanisms.

[0003] Currently, the acquisition of engine intake port valve lift-related performance mainly relies on two methods: steady-flow test bench measurements and computational fluid dynamics (CFD) simulations. Although steady-flow tests offer high measurement accuracy, they suffer from drawbacks such as long test cycles, high costs, inability to directly obtain internal flow field details, and difficulty in covering the entire operating lift range, making it difficult to meet the rapid iterative R&D needs of intake ports.

[0004] Traditional CFD simulations often employ a single-lift independent modeling and calculation approach. This requires repeated mesh generation, boundary condition setting, and solution parameter configuration for different valve lifts, resulting in low modeling efficiency, poor mesh compatibility, high computational redundancy, and weak comparability of multi-lift data. Furthermore, conventional airway CFD simulations do not incorporate customized parameter adaptations based on platform characteristics, leading to insufficient accuracy in capturing the flow field between the valve and airway wall. Under conditions of low lift and small flow cross-section, as well as high lift and large flow rate, the calculations exhibit poor convergence and large errors, failing to accurately match the engineering requirements of airway design.

[0005] In existing publicly available technologies, research mainly focuses on the optimization of air passage structure, design of variable valve mechanism, and construction of conventional CFD simulation process. Although there are some patents and literature related to CFD simulation of internal combustion engine air passage, most of them are applications of general CFD methods, which make it difficult to achieve efficient parallel calculation of multi-lift air passage flow field and integrated data output, thus restricting the improvement of engine air passage design accuracy and R&D efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide an engine air passage simulation calculation method, device, electronic device and storage medium, so as to at least solve the problem that existing simulations cannot meet the needs of engineering development, thereby improving R&D efficiency and simulation calculation accuracy.

[0007] To address the aforementioned technical problems, in a first aspect, the present invention provides an engine air intake simulation calculation method, comprising at least:

[0008] Construct a three-dimensional model of the engine's intake manifold and define the valve lift variable parameters;

[0009] The airway 3D model is meshed according to a preset meshing strategy to obtain an integrated mesh model.

[0010] The boundary of the integrated grid model is determined based on the actual working medium of the engine air passage and the steady flow test conditions.

[0011] The simulation calculation of the integrated mesh model is completed based at least on the valve lift variable parameters and the set boundaries.

[0012] Optionally, constructing the three-dimensional model of the engine's air intake specifically includes:

[0013] Construct an initial three-dimensional model that includes at least the intake port, valves, valve seats, piston, and cylinder head combustion chamber using a preset modeling method;

[0014] A repair process is performed on the initial three-dimensional model to obtain the airway three-dimensional model;

[0015] Define the valve lift variable parameters.

[0016] Optionally, determining the set boundary of the integrated mesh model based on the actual working medium of the engine air passage and the steady-flow test conditions specifically includes:

[0017] The actual working medium of the engine air passage is set to ideal air gas, and the pressure boundary conditions are set according to the steady flow test;

[0018] The defined boundaries of the integrated mesh model are determined based on the ideal air gas and the pressure boundary conditions.

[0019] Optionally, the step of performing simulation calculations of the integrated mesh model based at least on the valve lift variable parameters and the set boundaries specifically includes:

[0020] At least based on the valve lift variable parameters, a batch solution sequence for multiple lift conditions is constructed;

[0021] The simulation calculation of the integrated mesh model is completed based on the solution sequence and the defined boundary.

[0022] Secondly, the present invention also provides an engine air intake simulation calculation device, comprising at least:

[0023] The model building module is used to build a three-dimensional model of the engine's intake system and define valve lift variable parameters.

[0024] The mesh generation module is used to perform mesh generation operations on the airway 3D model based on a preset mesh generation strategy to obtain an integrated mesh model.

[0025] The boundary setting module is used to determine the set boundary of the integrated mesh model based on the actual working medium of the engine air passage and the steady flow test conditions.

[0026] The simulation calculation module is used to complete the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundary.

[0027] Optionally, the model building module is specifically used for:

[0028] An initial three-dimensional model is constructed using a preset modeling method, which includes at least the intake port, valve, valve seat, piston, and cylinder head combustion chamber; and a repair process is performed on the initial three-dimensional model to obtain the intake port three-dimensional model; and valve lift variable parameters are defined.

[0029] Optionally, the boundary setting module is specifically used for:

[0030] The actual working medium of the engine air passage is set as ideal air gas, and pressure boundary conditions are set according to the steady flow test; and the set boundary of the integrated mesh model is determined based on the ideal air gas and the pressure boundary conditions.

[0031] Optionally, the boundary setting module is specifically used for:

[0032] At least based on the valve lift variable parameters, a batch solution sequence for multiple lift conditions is constructed; and, based on the solution sequence and the set boundary, the simulation calculation of the integrated mesh model is completed.

[0033] Thirdly, the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor executes the program to implement the steps in the engine air passage simulation calculation method of any one of the first aspects.

[0034] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps in the engine air passage simulation calculation method according to any one of the first aspects.

[0035] The technical solution provided by the embodiments of the present invention firstly constructs a three-dimensional model of the engine's air passage; secondly, performs a meshing operation on the three-dimensional model of the air passage based on a preset meshing strategy to obtain an integrated mesh model; then, determines the set boundary of the integrated mesh model according to the actual working medium of the engine's air passage and the steady flow test conditions; finally, defines valve lift variable parameters to complete the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundary.

[0036] Therefore, this invention, on the one hand, constructs an integrated mesh model adaptable to the entire valve lift in one go through a preset mesh generation strategy, eliminating the need for repeated modeling and mesh generation for different lifts, significantly reducing repetitive work and improving modeling efficiency. On the other hand, this invention defines valve lift as a variable (i.e., valve lift variable parameters), enabling batch simulation calculations to be performed directly for different lifts based on the same integrated mesh model, without the need for repeated boundary and parameter configuration. This achieves efficient coverage of the entire valve lift range, which is beneficial for improving R&D efficiency and simulation accuracy. Attached Figure Description

[0037] Figure 1 This is a flowchart of an engine air passage simulation calculation method provided by an embodiment of the present invention;

[0038] Figure 2 This is a flowchart of another engine air passage simulation calculation method provided in an embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of an engine air passage simulation calculation device provided in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0043] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0044] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0045] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0046] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0047] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0048] Figure 1 This is a flowchart of an engine air intake simulation calculation method provided by an embodiment of the present invention. This embodiment is applicable to calculation scenarios of various engine air intake simulation models. The engine air intake simulation calculation method can be, but is not limited to, executed by the engine air intake simulation calculation device in this embodiment of the present invention as the execution subject. This execution subject can be implemented in software and / or hardware. Figure 1 As shown, the engine air intake simulation calculation method includes at least the following steps:

[0049] S1. Construct a three-dimensional model of the engine's intake manifold and define the valve lift variable parameters.

[0050] Among them, the three-dimensional model of the air passage can be a three-dimensional model of the engine air passage.

[0051] S2. Perform mesh generation operation on the airway 3D model based on the preset mesh generation strategy to obtain an integrated mesh model.

[0052] The preset mesh generation strategy can be a combination of unstructured polyhedral meshes as the primary component and boundary layer prism meshes as a secondary component. Furthermore, local mesh refinement is applied to key flow field areas such as the intake manifold region, valve-seat seal gap, valve head throttling region, and intake throat. Mesh adaptive adjustment is achieved based on valve lift parameters: the mesh size is reduced at low lift conditions to improve gap flow field capture accuracy, while the mesh size is appropriately widened at high lift conditions to ensure computational efficiency. Further, after mesh generation, mesh quality is checked to control mesh skewness ≤0.85, aspect ratio ≤5:1, and warpage ≤0.7, generating an integrated mesh model adaptable to the entire lift range, avoiding redundant mesh generation for different lifts and improving modeling efficiency. For example, the preset meshing strategy can be to use 6-8 layers of prism mesh for the boundary layer mesh, which fits the airway wall and valve surface. The height of the first layer of the boundary layer mesh is controlled to satisfy the y+ value in the range of 30-100, so as to accurately capture the boundary layer effect of the airflow on the wall. The mesh size in the valve and seat gap area is controlled at 0.1-0.3mm, the mesh size in the main airway area is controlled at 1-3mm, and the mesh size in the throttling area of ​​the airway throat is controlled at 0.5-1mm, so as to achieve a balance between accuracy and efficiency.

[0053] S3. Determine the boundary settings of the integrated grid model based on the actual working medium of the engine air passage and the steady flow test conditions.

[0054] The actual working medium can be an ideal gas, air. The defined boundaries can be constraints on the model, such as local drag parameters, turbulent viscosity coefficients, and total outlet pressure.

[0055] S4. At least based on the valve lift variable parameters and set boundaries, complete the simulation calculation of the integrated mesh model.

[0056] The simulation calculation can be completed under the condition of convergence and stability. It is understood that this embodiment sets an adaptive relaxation factor and convergence criterion. For the low valve lift variable parameter and small flow cross-section condition, the momentum and turbulence relaxation factors are reduced, and the iteration steps are extended to ensure flow field calculation convergence. For the high valve lift variable parameter and large flow rate condition, the iteration rate is optimized, the relaxation factor is appropriately increased, and the calculation time is shortened. Finally, the residual curve, flow monitoring point, and pressure monitoring point data are monitored in real time to ensure stable convergence and avoid result distortion caused by false convergence.

[0057] The technical solution provided in this embodiment firstly constructs a three-dimensional model of the engine's air passage and defines valve lift variable parameters; secondly, it performs a meshing operation on the three-dimensional model of the air passage based on a preset meshing strategy to obtain an integrated mesh model; then, it determines the set boundary of the integrated mesh model according to the actual working medium of the engine's air passage and the steady flow test conditions; finally, it completes the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundary.

[0058] Therefore, this embodiment demonstrates two advantages. First, by employing a pre-defined mesh generation strategy, it constructs an integrated mesh model adaptable to the entire valve lift in one go, eliminating the need for repeated modeling and mesh generation for different lifts, significantly reducing repetitive work and improving modeling efficiency. Second, by defining valve lift as a variable (i.e., valve lift variable parameters), this embodiment enables batch simulation calculations to be performed directly for different lifts based on the same integrated mesh model, without the need for repeated boundary and parameter configuration. This achieves efficient coverage of the entire valve lift range, improving R&D efficiency and simulation accuracy.

[0059] Based on the above embodiments or implementation methods Figure 2 This is a flowchart of another engine air intake simulation calculation method provided by an embodiment of the present invention. This embodiment is based on the above embodiment with additions. Figure 2 As shown, the engine air intake simulation calculation method includes at least the following steps:

[0060] S11. Construct an initial three-dimensional model that includes at least the intake port, valves, valve seats, piston, and cylinder head combustion chamber using a preset modeling method.

[0061] The preset modeling method can be modeling using 3D modeling software such as UG, SolidWorks, and Creo.

[0062] S12. Perform repair processing on the initial three-dimensional model to obtain the airway three-dimensional model.

[0063] The repair process can involve stitching and closing to eliminate defects such as geometric gaps, overlapping surfaces, and free edges, ensuring the stability of subsequent mesh generation and flow field calculations. Understandably, after the initial 3D model is generated, it can be imported into the STAR-CCM+ simulation platform to complete the repair process.

[0064] S13, Define valve lift variable parameters.

[0065] Specifically, by defining valve lift variable parameters, a target calculation lift range can be set, dividing the lift range into low, medium, and high typical lift levels to effectively cover the entire operating condition lift range. Specifically, the valve lift variable parameters can be set in a segmented manner, covering the full range of commonly used engine operating ranges, with a typical calculation lift set at 0.5-1mm intervals, balancing data integrity and computational efficiency. Furthermore, during geometric model preprocessing, the kinematic pair characteristics of valve lift adjustment need to be preserved, constructing a parameterized driving model to achieve dynamic linkage between the model and lift parameters, eliminating the need for repeated geometry reconstruction.

[0066] S2. Perform mesh generation operation on the airway 3D model based on the preset mesh generation strategy to obtain an integrated mesh model.

[0067] S31. Set the actual working medium of the engine air passage to ideal air gas, and set the pressure boundary conditions based on the steady flow test.

[0068] This embodiment is primarily based on the actual working medium of the engine's air intake and steady-flow test conditions. First, a suitable turbulence physics model is selected in STAR-CCM+. Considering the flow characteristics of the internal combustion engine's air intake, either the RNG k-ε turbulence model or the SST k-ω turbulence model is chosen, with wall functions enabled to handle the near-wall flow field, balancing calculation accuracy and convergence for low lift and low flow rate conditions as well as high lift and high flow velocity conditions. The actual working medium is set to ideal gas, air. Pressure boundary conditions are adopted according to steady-flow test standards. The intake simulation sets the inlet total pressure and outlet static pressure, and the exhaust simulation sets the inlet static pressure and outlet total pressure, simulating the standard steady-flow test conditions for the air intake. For example, under steady-flow test conditions, the intake simulation inlet total pressure is set to 5000 Pa, the outlet static pressure is set to 0 Pa, and the medium temperature is set to 298 K; the exhaust simulation inlet static pressure is set to 0 Pa, and the outlet total pressure is set to -5000 Pa, adapting to industry standard steady-flow test conditions.

[0069] S32. Determine the boundary conditions of the integrated mesh model based on ideal air gas and pressure boundary conditions.

[0070] In this embodiment, local resistance parameters and turbulent viscosity coefficients can be dynamically matched for different valve lift variable parameters to correct the impact of flow cross-section differences caused by lift changes on pressure and velocity distribution, ensuring accurate adaptation of boundary conditions and operating conditions.

[0071] S41. At least based on valve lift variable parameters, build a batch solution sequence for multiple lift conditions.

[0072] One approach is to build a batch solution sequence for multiple valve lift conditions based on valve lift variable parameters. This involves establishing a correlation mechanism between valve lift and solution parameters. In STAR-CCM+, the parametric scanning function loads preset multi-position valve lift parameters to build a batch solution sequence for multiple lift conditions, enabling simultaneous solution of multiple lifts. For example, STAR-CCM+ multi-core parallel computing mode can be used, allocating 4-16 cores of computing power to simultaneously solve multiple valve lift conditions, improving efficiency by over 40% compared to traditional independent calculation of a single lift.

[0073] S42. Simulation calculation of the integrated mesh model is completed based on the solution sequence and the set boundary.

[0074] Understandably, the convergence (i.e., completion) criteria for simulation calculations are set as follows: continuity, momentum, and turbulent residuals reduced to below 10^-4, and flow and pressure fluctuations at monitoring points less than 1%. Understandably, after calculation convergence, the STAR-CCM+ post-processing module extracts core performance data under different valve lifts, including airway flow coefficient, vortex ratio, tumble ratio, total pressure loss coefficient, airflow velocity field, pressure field, and turbulent kinetic energy distribution; it generates multi-lift performance comparison curves, flow field cloud maps, vector maps, and cross-sectional streamline diagrams, intuitively reflecting the influence of valve lift on airway flow performance and airflow motion; and it outputs standardized data reports and visualization maps, providing accurate data support for airway structure optimization and variable valve lift mechanism matching.

[0075] Furthermore, this embodiment can also verify and iteratively optimize the simulation results. For example, select 3-5 typical valve lift conditions, compare and verify the simulation calculation results with the measured data of the airway steady flow test bench, and correct the turbulence model parameters, grid refinement scale and boundary conditions based on error feedback to control the simulation error within 5%. Based on the accurate calculation results after verification, analyze the airway flow field defects under different lifts, and optimize the airway profile, valve cone angle, seat ring structure and airway throat curvature in a targeted manner. Iteratively carry out simulation calculations until the performance of the airway reaches the standard in the entire lift range, and complete the airway optimization design.

[0076] In a specific implementation scenario, the technical solution provided in this embodiment is as follows:

[0077] First, model construction and preprocessing: For a 1.5T turbocharged gasoline engine with four valve intake manifolds, an initial 3D model including the intake manifold, intake valves, valve seats, piston, cylinder head combustion chamber, and other components was constructed using Creo. The valve lift calculation range was set to 1mm-10mm, with a typical lift set at 1mm intervals, for a total of 10 calculation conditions. The model was then imported into STAR-CCM+, where geometric repair and sealing were performed to eliminate micro-gaps and free edge defects smaller than 0.02mm, and a parametric lift-driven model (i.e., the 3D model of the intake manifold) was constructed.

[0078] Secondly, for mesh generation, unstructured polyhedral meshes were mainly used. The mesh size for the valve and seat gap area was set to 0.2mm, the mesh size for the throttling area of ​​the airway throat was set to 0.8mm, and the mesh size for the main airway area was set to 2mm. Seven prism boundary layer meshes were generated on the wall, with the height of the first layer mesh controlled at 0.01mm and the y+ value maintained in the range of 50-80. Mesh quality checks showed that the skewness was ≤0.8 and the aspect ratio was ≤4.5:1, which met the calculation requirements. An integrated mesh model was generated without the need for repeated mesh generation.

[0079] Next, the physical model and boundary conditions were set. The SST k-ω turbulence model was selected, the standard wall function was enabled, and the fluid medium was 298K atmospheric pressure ideal gas air. The inlet of the air intake was set to a total pressure boundary of 101325Pa, and the outlet was set to a static pressure boundary of 0Pa. The local drag coefficient was dynamically corrected for different lifts. The drag coefficient correction value for low lift was +0.12, and the drag coefficient correction value for high lift was +0.05, matching the actual flow conditions.

[0080] Then, batch calculations were performed. Ten sets of valve lift variable parameters were loaded using the STAR-CCM+ parameter scanning function, and 8-core parallel computing was enabled with 32GB of memory allocated. For low lift (1mm-3mm), the momentum relaxation factor was set to 0.25, the turbulence relaxation factor was set to 0.3, and the number of iterations was set to 2500. For high lift (4mm-10mm), the momentum relaxation factor was set to 0.5, the turbulence relaxation factor was set to 0.55, and the number of iterations was set to 1800. The residual and flow data were monitored until the residual dropped below 10^-4 and the flow fluctuation was less than 1%, at which point the calculation was considered to have converged.

[0081] Finally, in the post-processing and data output, the flow coefficient, tumble ratio, and total pressure loss coefficient data under each valve lift variable parameter are extracted to generate full-lift performance comparison curves and flow field cloud maps. After verification by steady flow test, the simulation data error is ≤3.8%, accurately reflecting the full-lift performance law of the intake duct. Based on the data, the throat curvature and intake duct profile are optimized, which improves the average flow coefficient of the full lift by 6.7% and the high-lift tumble ratio by 8.2%.

[0082] In another specific implementation scenario, the technical solution provided in this embodiment is as follows: First, model construction and preprocessing: For a 2.0L diesel engine with two valve exhaust ports, an initial 3D model including the exhaust port, exhaust valve, valve seat, and cylinder head combustion chamber is constructed using SolidWorks; the valve lift calculation range is set to 2mm-12mm, with a typical lift set at 1.5mm intervals, for a total of 7 calculation conditions; the model is imported into STAR-CCM+ to complete geometric repair, eliminate geometric defects, and construct the initial 3D model of the parametric lift model. Second, mesh generation: a polyhedral mesh is used, with a valve and seat gap mesh size of 0.25mm, a main exhaust port mesh size of 2.5mm, and a 6-layer prism boundary layer mesh generated on the wall surface, with the y+ value controlled between 40-90; the mesh skewness is ≤0.82, meeting the calculation requirements, and a full-lift adaptive mesh (i.e., an integrated mesh model) is generated. Next, the physical model and boundary conditions were set using the RNG k-ε turbulence model with air at 298K as the fluid medium. The exhaust duct inlet was set to a static pressure boundary of 0 Pa, and the outlet to a total pressure boundary of 101325 Pa. The turbulence dissipation coefficient was dynamically matched for different lifts to ensure the accuracy of the flow field calculation. Then, batch calculations were performed using STAR-CCM + 6-core parallel computing. For low lifts (2mm-4.5mm), the relaxation factor was 0.3, with 2200 iterations; for high lifts (6mm-12mm), the relaxation factor was 0.5, with 1600 iterations. The convergence judgment residual was ≤10^-4, and the flow fluctuation was ≤0.8%. Finally, post-processing and optimization were performed. The exhaust duct flow coefficient and pressure loss data were extracted, and the simulation error was ≤4.2%. Based on the data, the exhaust duct corner profile was optimized, reducing the average exhaust resistance by 5.9% across the entire lift and improving exhaust flow efficiency.

[0083] Therefore, compared with the prior art, this embodiment has at least the following beneficial effects:

[0084] Multi-lift integrated mesh adaptive technology: It abandons the traditional repetitive mesh division mode, realizes dynamic control of mesh size based on valve lift parameters, and sets mesh accuracy threshold by partitioning to balance the accuracy of flow field capture under low lift gap and the computational efficiency under high lift conditions.

[0085] Lift-Solution Parameter Linkage Matching Mechanism: The relaxation factor, iteration steps and convergence criteria are customized for different lift ranges to achieve refined solution for low lift and small amplitude conditions and efficient solution for high lift and large flow conditions. This solves the problems of poor compatibility between high and low lift conditions and difficulty in computational convergence in traditional simulations, and has significant technical innovation.

[0086] STAR-CCM+ Customized Batch Solving Process: Based on the parametric scanning function of the STAR-CCM+ platform, a multi-lift batch solving sequence is built. Combined with multi-core parallel computing, multi-condition synchronous solving is achieved. A closed-loop process with standardized data output and experimental verification is provided to form a dedicated systematic method for airway multi-lift simulation.

[0087] Figure 3 This is a schematic diagram of the structure of an engine air passage simulation calculation device provided in an embodiment of the present invention. This embodiment is applicable to calculation scenarios for various engine air passage simulation models. The engine air passage simulation calculation device can be implemented in software and / or hardware. Figure 3 As shown, the engine air passage simulation calculation device includes at least:

[0088] Model building module 110 is used to build a three-dimensional model of the engine's intake system and define valve lift variable parameters;

[0089] Mesh generation module 120 is used to perform mesh generation operation on the airway 3D model based on a preset mesh generation strategy to obtain an integrated mesh model.

[0090] The boundary setting module 130 is used to determine the setting boundary of the integrated grid model based on the actual working medium of the engine air passage and the steady flow test conditions.

[0091] The simulation calculation module 140 is used to complete the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundaries.

[0092] Optionally, the model building module 110 is specifically used for:

[0093] An initial three-dimensional model is constructed using a preset modeling method, which includes at least the intake port, valves, valve seats, piston, and cylinder head combustion chamber; and a repair process is performed on the initial three-dimensional model to obtain the intake port three-dimensional model; and valve lift variable parameters are defined.

[0094] Optionally, the boundary setting module 130 is specifically used for:

[0095] The actual working medium of the engine air passage is set as ideal air gas, and the pressure boundary conditions are set according to the steady flow test; and the boundary conditions of the integrated grid model are determined based on the ideal air gas and the pressure boundary conditions.

[0096] Optionally, the boundary setting module 140 is specifically used for:

[0097] At least a batch solution sequence for multiple lift conditions should be built based on valve lift variable parameters; and simulation calculations of an integrated mesh model should be completed based on the solution sequence and defined boundaries.

[0098] The technical solution provided in this embodiment firstly constructs a three-dimensional model of the engine's air passage through a model building module and defines valve lift variable parameters; secondly, a mesh generation module performs mesh generation operations on the three-dimensional model of the air passage based on a preset mesh generation strategy to obtain an integrated mesh model; then, a boundary setting module determines the set boundary of the integrated mesh model according to the actual working medium of the engine's air passage and the steady flow test conditions; finally, a simulation calculation module completes the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundary.

[0099] Therefore, this embodiment demonstrates two advantages. First, by employing a pre-defined mesh generation strategy, it constructs an integrated mesh model adaptable to the entire valve lift in one go, eliminating the need for repeated modeling and mesh generation for different lifts, significantly reducing repetitive work and improving modeling efficiency. Second, by defining valve lift as a variable (i.e., valve lift variable parameters), this embodiment enables batch simulation calculations to be performed directly for different lifts based on the same integrated mesh model, without the need for repeated boundary and parameter configuration. This achieves efficient coverage of the entire valve lift range, improving R&D efficiency and simulation accuracy.

[0100] This embodiment provides an electronic device. Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. See also: Figure 4 The electronic device 1000 includes a processor 1001 and a memory 1002. The memory 1002 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 1001, the steps in any of the above-described engine air passage simulation calculation methods are performed. Through the above technical solution, the processor 1001 and the memory 1002 are interconnected and communicate with each other via a communication bus and / or other forms of connection mechanisms (not shown). The memory 1002 stores a processor-executable computer program. When the electronic device 1000 is running, the processor 1001 executes the computer program to perform the engine air passage simulation calculation method in any of the optional implementations of the above embodiments, to at least achieve the following functions: constructing a three-dimensional model of the engine air passage; performing a meshing operation on the three-dimensional model of the air passage based on a preset meshing strategy to obtain an integrated mesh model; determining the set boundary of the integrated mesh model according to the actual working medium of the engine air passage and the steady flow test conditions; defining valve lift variable parameters to complete the simulation calculation of the integrated mesh model at least based on the valve lift variable parameters and the set boundary.

[0101] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the engine air passage simulation calculation method provided in all embodiments of this application: constructing a three-dimensional model of the engine air passage; performing a meshing operation on the three-dimensional model of the air passage based on a preset meshing strategy to obtain an integrated mesh model; determining the set boundary of the integrated mesh model according to the actual working medium of the engine air passage and the steady flow test conditions; defining valve lift variable parameters to complete the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundary.

[0102] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0103] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0104] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0105] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simulating and calculating engine air intakes, characterized in that, At least including: Construct a three-dimensional model of the engine's intake manifold and define the valve lift variable parameters; The airway 3D model is meshed according to a preset meshing strategy to obtain an integrated mesh model. The boundary of the integrated grid model is determined based on the actual working medium of the engine air passage and the steady flow test conditions. The simulation calculation of the integrated mesh model is completed based at least on the valve lift variable parameters and the set boundaries.

2. The engine air passage simulation calculation method according to claim 1, characterized in that, The construction of a three-dimensional model of the engine's intake manifold and the definition of valve lift variable parameters specifically include: Construct an initial three-dimensional model that includes at least the intake port, valves, valve seats, piston, and cylinder head combustion chamber using a preset modeling method; A repair process is performed on the initial three-dimensional model to obtain the airway three-dimensional model; Define the valve lift variable parameters.

3. The engine air passage simulation calculation method according to claim 1, characterized in that, The determination of the boundary settings for the integrated mesh model based on the actual working medium of the engine air passage and the steady-flow test conditions specifically includes: The actual working medium of the engine air passage is set to ideal air gas, and the pressure boundary conditions are set according to the steady flow test; The defined boundaries of the integrated mesh model are determined based on the ideal air gas and the pressure boundary conditions.

4. The engine air passage simulation calculation method according to claim 1, characterized in that, The simulation calculation of the integrated mesh model, based at least on the valve lift variable parameters and the defined boundaries, specifically includes: At least based on the valve lift variable parameters, a batch solution sequence for multiple lift conditions is constructed; The simulation calculation of the integrated mesh model is completed based on the solution sequence and the defined boundary.

5. An engine air intake simulation calculation device, characterized in that, At least including: The model building module is used to build a three-dimensional model of the engine's intake system and define valve lift variable parameters. The mesh generation module is used to perform mesh generation operations on the airway 3D model based on a preset mesh generation strategy to obtain an integrated mesh model. The boundary setting module is used to determine the set boundary of the integrated mesh model based on the actual working medium of the engine air passage and the steady flow test conditions. The simulation calculation module is used to complete the simulation calculation of the integrated mesh model based at least on the valve lift variable parameters and the set boundary.

6. The engine air passage simulation calculation device according to claim 5, characterized in that, The model building module is specifically used for: An initial three-dimensional model is constructed using a preset modeling method, which includes at least the intake port, valve, valve seat, piston, and cylinder head combustion chamber; and a repair process is performed on the initial three-dimensional model to obtain the intake port three-dimensional model; and valve lift variable parameters are defined.

7. The engine air passage simulation calculation device according to claim 5, characterized in that, The boundary setting module is specifically used for: The actual working medium of the engine air passage is set as ideal air gas, and pressure boundary conditions are set according to the steady flow test; and the set boundary of the integrated mesh model is determined based on the ideal air gas and the pressure boundary conditions.

8. The engine air passage simulation calculation device according to claim 5, characterized in that, The boundary setting module is specifically used for: At least based on the valve lift variable parameters, a batch solution sequence for multiple lift conditions is constructed; and, based on the solution sequence and the set boundary, the simulation calculation of the integrated mesh model is completed.

9. An electronic device comprising a memory and a processor, the memory storing a computer program executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the engine air passage simulation calculation method according to any one of claims 1 to 4.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the engine air passage simulation calculation method according to any one of claims 1 to 4.

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