低雷诺数k-ε模型钝体绕流场预测能力研究

Comparison of low Reynolds Number k-ε Models in Predicting Complicated Flow Field Around a Bluff Body

摘要:

以1∶3缩比标准MIRA三厢车型为对象，基于合理的网格策略，应用AB、LS、AKN和CHC四种低雷诺数k-ε湍流模型，对其外部绕流场进行数值仿真.以风洞试验数据为准，通过比较气动阻力系数及车身表面压力系数，系统研究四种低雷诺数湍流模型针对处于车体不同部位存在不同运动特征流动的仿真特性，进而明确四种低雷诺数模型针对高雷诺数临地面钝体绕流预测能力的强弱.

Abstract:

Four low Reynolds number kε turbulence models were adopted to numerically simulate the flow field around 1∶3 scaled standard Moto Industry Research Association(MIRA) sedan model with reasonable grid strategy. Based on wind tunnel test data, the feature of different low Reynolds number k-ε turbulence models for simulating different flow fields with unique movement characteristics around special parts of vehicle body was studied systematically by comparing CD, surface pressure coefficient and oil flow patterns on the surface. Finally, the levels of ability to predict the high Reynolds number flow around a bluff body near ground of four low Reynolds number k-ε turbulence models was identified.