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首页> 外文会议>Vehicle aerodynamics, 2012. >CFD Simulation with Automatic Mesh Refinement for the Flow around Simplified Car Models
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CFD Simulation with Automatic Mesh Refinement for the Flow around Simplified Car Models

机译：具有简化网格模型周围流动的自动网格细化的CFD模拟

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This paper presents simulations for the prediction of the flow around a passenger vehicle. The flow solver used is ISIS-CFD developed by the Numerical Modeling Group of the Fluid Mechanics Laboratory of Ecole Centrale de Nantes. The CFD simulation is carried out with the Explicit Algebraic Stress Model (EASM) turbulence model. For improved precision, the recently developed automatic adaptive grid refinement procedure of the flow solver is used. This procedure is built for unstructured hexahedral grids and naturally supports both isotropic and anisotropic grid refinement to keep the grid sizes small for 3D simulations. The refinement criterion used to indicate the locations of grid refinement is based on the second spatial derivatives of the pressure. This criterion is efficient for flows with strong local vorticity. Three models are used to validate this approach: the Ahmed model, the Willy model and a pickup truck model. The main goal of the simulation is the accurate computation of the trailing vortices of these models. The automatic grid refinement is used to provide the local high grid density needed to create and track these vortices. Comparisons between the numerical results and experimental data are reported.
机译：本文介绍了用于预测乘用车周围流量的模拟。所使用的流动求解器是由南特中央大学流体力学实验室的数值建模小组开发的ISIS-CFD。 CFD仿真是通过显式代数应力模型（EASM）湍流模型进行的。为了提高精度，使用了最近开发的流量求解器的自动自适应网格优化程序。此过程是为非结构化六面体网格构建的，并且自然支持各向同性和各向异性网格细化，以保持3D模拟的网格尺寸较小。用于指示网格细化位置的细化标准基于压力的第二空间导数。对于具有强局部涡度的流动，此标准是有效的。使用三种模型来验证此方法：Ahmed模型，Willy模型和皮卡车模型。仿真的主要目标是精确计算这些模型的尾涡。自动网格细化用于提供创建和跟踪这些涡旋所需的局部高网格密度。报告了数值结果和实验数据之间的比较。

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