轿车外流场网格生成策略及数值模拟

Mesh Generation Strategies of the External Flow Field around a Sedan and the Numerical Simulation Research

采用3种网格策略对某轿车外流场进行数值模拟研究,并应用商业CFD软件STAR-CD进行求解。根据计算过程和结果,分析不同网格策略的效果,论述3种网格策略的特点。数值模拟中考虑了车轮旋转和车轮固定两种边界条件,并将数值计算结果与试验数据进行了对比分析,探讨了高雷诺数k-ε湍流模型的计算精度。

Three mesh strategies were applied in the numerical simulation research of the external flow field around a sedan. Computational meshes were solved by commercial CFD software, STAR - CD. Mesh strategies effects were compared and their features were summarized according to the different computational processes and results. Both the rotating and stationary wheels boundary conditions were considered and computational results were compared with available experimental data. The accuracy of the high Reynolds k - ε turbulence model was discussed.