Vortex-Induced Vibration of a Circular Cylinder at Low and Subcritical Reynolds Numbers – Part II: Subcritical Reynolds Number

Abstract

The vortex-induced vibration of a circular cylinder at a low subcritical Reynolds number of 3900 over wide ranges of the influencing parameters is reported in this part of the paper. The cylinder dynamics is modeled using a spring-damper-mass system and the fluid dynamics is simulated using a large eddy simulation approach. An implicit, collocated moving grid finite volume algorithm implemented on an unstructured triangular mesh is adopted to solve the fluid dynamic equations. Large-amplitude vibration occurs over a certain range of frequency ratio. The large-amplitude vibration of the cylinder affects the flow and wake structure considerably. When the frequency ratio is out of this range, the vibration amplitude is small.  However, at low subcritical Reynolds number, the force coefficients undergo large amplitude oscillation even when the vibration amplitude is reasonably small.

Keywords: Vortex-induced vibration, wake structure; vortex pattern, cylinder response, unsteady fluid forces, reduced damping, collocated grid, geometric conservation law

Cite this Article

Sintu Singha and K. P. Sinhamahapatra. Vortex-Induced Vibration of a Circular Cylinder at Low and Subcritical Reynolds Numbers – Part II: Low Reynolds Numbers. Journal of Aerospace Engineering and Technology (JoAET). 2015; 5(2): 60–70p.