Galloping oscillation of a circular cylinder firmly combined with different shaped fairing devices

Abstract

The galloping oscillation of a circular cylinder combined with different fairing devices is numerically studied. The fairing devices are integrated with a circular cylinder that is supported by a spring and a damper. An unsteady Reynolds-averaged Navier–Stokes (URANS) model corrected with the arbitrary Lagrange Euler (ALE) method is used as the governing model of the fluid flow while the governing equations are solved with a total variation diminishing (TVD) finite volume method (FVM). The SST turbulence model is used. The fluid–structure-interaction (FSI) simulations are performed under the reduced velocities ranging from 3 to 25. The simulation results are validated with the available experimental and numerical results with a short-tail fairing device. The influences of the shapes and the characteristic lengths of the fairing devices on the galloping oscillation are discussed. The shape of the fairing devices are found to influence the vortex shedding patterns in the wake of the flow field while the characteristic length decides the galloping behavior of the cylinder at different reduced velocities. The fairing devices with the smallest characteristic length have the best vibration suppression performance in the present study.