Numerical Simulations of Flow Past an Aspirated Fairing With Three Degree-of-Freedom Motion

Abstract

We simulate the flow past circular cylinders that are outfitted with plain and aspirated short aspect ratio fairings. Aspirated fairings aim to reduce the mean drag by means of suction holes and blow holes strategically placed around the circumference of the fairing. Several designs are presented here, including centered and off-centered suction, and the designs assessed in terms of mean drag reduction and vortex-induced vibration suppression. We consider flow conditions that correspond to a high Reynolds number of 106, and allow for three degree-of-freedom motions where the structure is allowed to respond to flow-induced cross flow forces, in-line forces, and spanwise moments. The computations are performed using a parallelized Navier-Stokes in-house developed solver using overset grids.