The purpose of this study is to clarify the hydrodynamic vibration factors of automobile side-view mirror surface by using both methods experimental technique and CFD, which clarified the relationship between separated vortices which induce hydrodynamic forces and vibration of mirror surface. As a result, it was found that the frequency of the side-view mirror obtained by the vibration pickups is almost equivalent to that of vortices shedding from the mirror body itself. CFD made it clear that there exists the region with the largest force on the mirror surface where pressure fluctuations are induced by flow velocity fluctuations over the region.
