NUMERICAL PREDICTIONS OF FORCES ON A LONG RECTANGULAR PLATE SUBJECTED TO CROSS-FLOW PERTURBATION

摘要

Numerical predictions of the standard deviation of lift and mean drag force are presented for rectangular cross-sectioned plates with aspect ratios (c/t) = 6―16. The simulations are at Re = 400 and the plates are subjected to a sinusoidal oscillation with an amplitude of 2.5% of free-stream velocity in the frequency range of 0.1 < St < 0.2. The peaks in drag force with varying c/t display a stepwise increase in St_c suggesting that the response is dominated by an Impinging Leading-Edge Vortex (ILEV) instability. Overall the fluctuating component of lift shows an increase with frequency but decreases close to these frequencies at which the drag is a maximum.