Driving safety and comfort have enormous relationship with the flow field surrounding vehicles.Especially, when two cars mutually overtake each other, flow field becomes complicated because thehigh-speed wind impinging on vehicles will cause disturbance phenomenon. This paper analyzes theflow field of two vehicles overtaking using the Computation Fluid Dynamics (CFD) method, andapplies dynamic grid technique to solve the unsteady 3D Navier-Stokes equation. This study usedthree test models for different vehicles spaces to monitor the change in flow field and to analyzerelated aerodynamic coefficients. The results showed that, when two vehicles spacing is very small,aerodynamic characteristic caused by the large vehicle has a very tremendous influence on the smallcar. This affects the drivability and control ability of the driver in the small car.
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