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PRIMARY INSTABILITY OF THE CHANNEL FLOW WITH A STREAMWISE-PERIODIC ARRAY OF CIRCULAR CYLINDERS - EFFECTS OF THE DISTANCE BETWEEN THE CYLINDER AND THE CHANNEL WALL -  

Yoon, D.H. (한국원자력안전기술원)
Yang, K.S. (인하대학교 기계공학부)
Kang, C. (인하대학교 대학원 기계공학과)
Publication Information
Journal of computational fluids engineering / v.15, no.3, 2010 , pp. 54-59 More about this Journal
Abstract
A parametric study has been carried out to elucidate the characteristics of channel flow with a streamwise-periodic array of cylinders. This flow configuration is relevant to heat exchanger applications. The presence of cylinders in channel flow causes the attached wall boundary layer to separate, leading to significant change in flow instabilities. There exist two kinds of instabilities; flow undergoes a primary instability (Hopf bifurcation) at a lower Reynolds number, and the unsteady two-dimensional flow becomes unstable to three-dimensional disturbances at a higher Reynolds number. We report here the dependencies of the primary instability as well as the flow characteristics of the subsequent unsteady flow, including flow-induced forces and Strouhal number of vortex shedding, on the distance between the cylinder and the channel wall.
Keywords
Channel Flow; Circular Cylinder; Flow Instability;
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