High-frequency rotary oscillations control of flow around cylinder at Re = 1.4:105

Abstract

We perform a series of URANS simulations of the flow over a rotary oscillating cylinder at Re = 1.4 105 to study the possible reduction of the drag and lift forces acting on the body when the rigid wall is rotary oscillating around the axis of symmetry. Two parameters of the external forcing are varied, i.e. the amplitude of rotation and the frequency. We find that the high-frequency and relatively high-amplitude forcing leads to the drag reduction of 78% compared to the non-rotating case. The oscillations (rms) of drag and lift coefficients are also significantly reduced.