Numerical studies on the early stages of an impulsively started unsteady flow past sharp-edged cylinders at different incidence angles

Abstract

Characteristics of the development of an impulsively started flow past sharp-edged cylinders at different incidence angles were studied numerically. The inflow Reynolds number considered ranges from 25 to 250. Main characteristics of the vortex shedding processes were studied through the developing streamlines. Other flow characteristics are analyzed in terms of pressure contours, surface pressure coefficient and drag coefficient. The continuous alternate vortex shedding processes from the slant edge and the base are analyzed. The larger the Reynolds number, the faster the process of vortex shedding. The angle between the slant edge and the flow direction and the angle between the base and the flow direction determine the shedding location of the first vortex.