Study on the control of flow past circular cylinder at subcritical Reynolds number by LES

摘要

The paper investigates the dynamic performance of incompressible flow around circular cylinder with cyclic oscillation around the cylinder axis by Large Eddy Simulation (LES) with dynamic model for subgrid stress. The filtered N-S equation is solved numerically by finite volume method with rectangular grids and the immersed boundary method is used to satisfy the non-slip condition. The results show that the drag is increased when the oscillating frequency equals the frequency of vortex shedding of flow around stationary circular cylinder, i.e. non-dimensional frequency equaling 0.2, while the drag is reduced at non-dimensional oscillating frequency equaling 1.0.