基于风洞试验的汽车气动阻力计算网格模型优化

摘要

A local refined mesh parameter is analyzed, and three geometrical models in CFD 3D numerical simulation in model development process in presented based on this parameter. By contrasting different optimized geometrical model and combining wind tunnel test data, the optimal joint point is found for cost and accuracy calculation. Then the optimal CFD analysis model is constructed based on development node and optimization program to guide optimization of aerodynamic resistance in vehicle model development. The results of analysis indicate that the optimal mesh parameter and rational geometrical model can effectively save calculation cost and improve calculation accuracy.%分析了一种局部加密网格参数，并在此参数基础上提出车型开发过程中CFD三维数值模拟的3个几何模型。通过对比优化后不同的几何模型，并结合风洞试验数据，找到计算成本和计算精度的最佳交接点。进而可根据开发节点和优化方案来对应不同的最优CFD分析模型，以指导车型开发中气动阻力的优化工作。分析结果表明，最佳网格参数和合理的几何模型可有效节约计算成本和提高计算精度。