Unsteady Simulation and Mode Analysis of Disturbed Cylinder Flow

Abstract The unsteady simulation of cylinder flow with inlet velocity disturbance is simulated and compared that without disturbance. POD adopted to analyze capture the dominant modes vortex street in wake. results show method efficient reconstructing field. When exists, number required reconstruct field accurately almost unchanged, but energy proportion each mode changes. larger frequency is, smaller shape vorticity magnitude slower generation speed is. If deviates too much from original field, effect will be shielded.