Active Control of Oscillatory Lift Forces on a Circular Cylinder

摘要

The results of a computational and experimental study of feedback control ofKarman vortex shedding behind a circular cylinder are presented. The experiments were performed in a nominally two dimensional flow around a 12.7 mm cylinder at Reynolds numbers up to 10,000. The computations utilized the two-dimensional Navier-Stokes equations at Reynolds numbers up to 100. In both experimental and numerical studies blowing and suction slots were used to control the vortex shedding. In the numerical study complete suppression of vortex shedding is achieved up to a Reynolds number Re = 80 (about 70% above the onset Reynolds number for vortex shedding). In the experimental study using the fluctuating lift force as feedback, about 50% suppression of the rms fluctuations has been achieved at a Reynolds number of approximately 10,000. Ocean technology, Fluid mechanics.