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论文类型：期刊论文

发表时间：2014-01-01

发表刊物：JOURNAL OF FLUIDS AND STRUCTURES

收录刊物：SCIE、EI

卷号：44

页面范围：145-165

ISSN号：0889-9746

关键字：Traveling wave wall; Flow control; Vortex-induced vibration; Two degree of freedom; CFD numerical simulation

摘要：In the present paper, the commercial CFD code "Fluent" was employed to perform 2-D simulations of an entire process that included the flow around a fixed circular cylinder, the oscillating cylinder (vortex-induced vibration, VIV) and the oscillating cylinder subjected to shape control by a traveling wave wall (TWW) method. The study mainly focused on using the TWW control method to suppress the VIV of an elastically supported circular cylinder with two degrees of freedom at a low Reynolds number of 200. The cross flow (CF) and the inline flow (IL) displacements, the centroid motion trajectories and the lift and drag forces of the cylinder that changed with the frequency ratios were analyzed in detail. The results indicate that a series of small-scale vortices will be formed in the troughs of the traveling wave located on the rear part of the circular cylinder; these vortices can effectively control the flow separation from the cylinder surface, eliminate the oscillating wake and suppress the VIV of the cylinder. A TWW starting at the initial time or at some time halfway through the time interval can significantly suppress the CF and IL vibrations of the cylinder and can remarkably decrease the fluctuations of the lift coefficients and the average values of the drag coefficients; however, it will simultaneously dramatically increase the fluctuations of the drag coefficients. (C) 2013 Elsevier Ltd. All rights reserved.