Flow Visualization of Longitudinal Vortex Appeared at Vortex Formation of Two-Dimensional Wake

Abstract

It is well known that longitudinal vortex appears in two-dimensional vortex street wake. The purpose of this study is to clarify about details of formation process of this longitudinal vortex and interaction between longitudinal vortex and two-dimensional vortex street wake by using flow visualization. As the result , it was found that the formation process of longitudinal vortex and the interaction mechanism depend on Reynolds number.