Numerical simulation of vortex-induced vibration of four circular cylinders in a square configuration

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• 作者：Ming Zhao^a ; ^{m.zhao@uws.edu.au} ; Liang Cheng^b
• 关键词：Vortex-induced vibration ; Circular cylinder ; Steady flow ; Vortex shedding ; Numerical model
• 刊名：Journal of Fluids and Structures
• 出版年：2012
• 期刊代码：187_08899746
• 类别：et
• 出版时间：May, 2012
• 卷：31
• 期：Complete
• 页码：125-140
• 文件大小：3406 K

摘要

Two-degree-of-freedom Vortex-Induced Vibration (VIV) of four rigidly coupled circular cylinders in a square configuration is investigated numerically. Two-dimensional Reynolds-Averaged Navier-Stokes equations and SST k-蠅 turbulence equations are solved using a finite element method. Simulations are carried out for flow approaching angles of 伪=0掳, 15掳, 30掳 and 45掳 and the reduced velocities ranging from 1 to 20 with an interval of 1. The Reynolds number ranges from 1000 to 20 000. The numerical results show that the approaching angle has significant effects on the response of the four-cylinder system. The lock-in region for 伪=15掳 is the widest (between 3鈮?em>V_r鈮?2) among the other cases investigated, while the lock-in region for 伪=45掳 is the narrowest (between 2鈮?em>V_r鈮?). For 伪=0掳, the vibration is generally irregular in the lock-in region. Regular and periodic vibrations are observed in the lock-in zone for approaching angles except 伪=0掳, although the hydrodynamic forces, especially those on the two downstream cylinders, are very irregular.