Discrete-Vortex Simulation of Unsteady Separated Flow behind a Nearly Normal Plate

Abstract

A discrete-vortex model is developed for a separated flow past a nearly normal plate immersed in a uniform flow. A reduction in the strength of vortices is introduced as a function of their age to simulate the cancellation of vorticity in near wake. The mean and fluctuating velocities in the near wake, the drag and the convection velocity of rolled-up vortices showed fairly good agreement with experiment. An unifavourable aspect of the reduction in the vortex strength is to yield a higher Strouhal number of vortex shedding than experiment.