Vehicle Transient Aerodynamic Characteristics on Curve Crossing

Abstract:

The method of Computational Fluid Dynamics was applied to numerically simulation. Based on overlapping grid, the transient aerodynamic characteristics of the flow field around two vehicles were studied when simplified model were crossing each other in a curve. The change rules of six aerodynamic components were achieved. In the process of short meeting, side force and rolling moment as well as the yawing moment changed direction, quickly reached their positive and negative value. The side force, rolling moment and yawing moment of CAR 1 inside curve were slightly larger than those of CAR 2 outside curve. The lift force and pitching moment were changed on value and direction. All of these would bring some influence on vehicle driving stability. This study provided theoretical reference for the further study of curve crossing.

Key words:curve crossing; vehicle engineering; transient aerodynamic characteristics; overlapping grid; numerical simulation