Numerical investigation of flow-induced vibration of elastic circular and square cylinders
In this paper, vortex-induced vibration of elastically mounted circular and square cylinders in uniform flow had been studied by solving the two-dimensional viscous incompressible Navier-Stokes equations. The cylinder motion was modeled by a mass-spring-damper system, where the mass and natural frequencies are precisely the same in both transverse and streamwise directions. The motion equation of the cylinder was solved by Newmark-β Method which was manually written into the User-Defined Function of Fluent software. To realize the fluid-structure interaction between the cylinders and flow field, the dynamic mesh technique was utilized. Numerical results are presented for the response of cylinders at low mass damping constrained to oscillate transversly to a fluid flow. The dependences of the characteristic value of both the vortex induced force coefficient and the cylinder’s displacement on the frequency ratio were analyzed in detail respectively. The locus of centroid was got when the influence of streamwise vibration on transverse vibration was taken into computation, and the result of two degree-of-freedom confirm with the single degree-of-freedom. The “phase switch phenomena are obtained successfully. The “galloping occurs in low frequency ratio range for the square cylinder, and gradually changes to vortex-induced vibration as the frequency ratio increases; but the circular cylinder are keeping vortex induced vibration in whole range of frequency ratio. Compared with the current computational results, it confirms that this method is feasible to research on the fluid-structure interactions problem of rigid body.
vortex-induced vibration galloping cylinder dynamic mesh
Feng Xu Yiqing Xiao Jinping Ou
School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China Harbin Institute of Technology Shenzhen Graduate School,Shenzhen 518055,China School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;School of Civil & Hyd
国际会议
第六届国际振动工程会议(The 6th International Conference on Vibration Engineering)(ICVE’ 2008)
大连
英文
2008-06-04（万方平台首次上网日期，不代表论文的发表时间）