휠 회전과 지면효과를 고려한 CFD 모델에서의 차량공력성능

Recently automotive manufacturer continue their effort to efficient powertrain development, reduction mass and drag for following fuel economy improvement and emission regulation. Particularly, drag reduction is valuable fuel economy enabler for cost. There are many wind tunnels to measure drag reduction in the world. Each wind tunnel has its own setting. According to each own setting, different drag coefficient could be measured for same production vehicle. In this paper, build analysis model for CFD(Computational Fluid Dynamics) from real wind tunnel which be able to measure drag force of vehicle. And, compare drag coefficient from physical wind tunnel test and drag coefficient from CFD simulation for each ground condition and wheel rotating.