차량 후미부 형상 변경에 따른 공력 횡풍 안정성 개선에 관한 수치해석 연구

The Numerical Assessment with Modified Vehicle Rear Body Shape on the Aerodynamic Crosswind Stability Improvement

The vehicle aerodynamic crosswind characteristics are mainly governed by the coefficient of side force and yawing moment. These performances affect not only the driving comfort which can be felt by driver but also the safety due to the instability of vehicle. The aims of this investigation are to improve the aerodynamic crosswind performance of sedan vehicle under the crosswind conditions. In order to improve the crosswind stability, numerical analysis has been performed by modifying the rear body shape of vehicle. As the results, we observed about 20% reduction of yawing moment coefficient relative to the base vehicle.