EFFECTS DUE TO INITIAL PERTURBATIONS ON THE MODELING OF VORTEX SHEDDING FROM A BLUFF-BODY IN A LAMINAR-FLOW

An investigation into the effects of initial perturbation mechanisms o n the simulation of steady-state vortex shedding from a square cross-s ection cylinder at a Reynolds number of 200 is presented, The simulati on of the near wake velocity field is shown to be affected by the choi ce of initial perturbation mechanism, The time-step size when using an automatic variable time-step procedure is also affected by the choice of this initial perturbation mechanism, The perturbation mechanism ne cessitates asymmetry for the vortex shedding to take place on a high d ensity mesh.