报告题目：PANS investigation of the influence of ground and wheel motion on the aerodynamic behaviors of a van
报 告 人：Sinisa Krajnovic，瑞典查尔姆斯理工大学机械和海洋科学学院院长，计算流体力学领域教授。
报告时间：2023年6月30日 9:30-10:30
报告地点：南岭校区汽车大楼214多功能厅
报告提要：A numerical investigation of the effects of the moving ground and rotating wheels on the turbulent flow around a square-back van model will be presented. A comparison among the partially averaged Navier–Stokes (PANS), large eddy simulation (LES) and particle image velocimetry (PIV) involving the aerodynamic drag, the wake topology, the velocity and the Reynolds stress profiles in the wake region is conducted. The proper orthogonal decomposition and fast Fourier transform are applied to the shear layers shedding from the trailing edges to comment on the coherent structures and their frequency content. The results show that PANS accurately predicts the flow field measured in experiments and predicted by a resolved LES, even with a low-resolution grid. The superiority of the PANS approach could provide good guidance for industrial research in predicting the turbulent flow around the van model with affordable computational grids. The wheel and ground motion mechanism on the aerodynamic forces has been revealed by analyzing the surface pressure distribution, the wheels’ surrounding flow, the underbody flow characteristics and the turbulent wake structures. The effects of the ground and wheel motion on the frequency, evolution and development characteristics of the wake shear layers are analyzed, providing relevant insights for future experimental investigations of square-back van models.
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