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FORCE REDUCTION OF FLOW AROUND A SINUSOIDAL WAVY CYLINDER
Authors:ZOU Lin School of Mechanical  Electronic Engineering  Wuhan University of Technology  Wuhan  China  LIN Yu-feng
Affiliation:[1]School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China [2]Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Abstract:A large eddy simulation of cross-flow around a sinusoidal wavy cylinder at Re=3000 was performed and the load cell measurement was introduced for the validation test. The mean flow field and the near wake flow structures were presented and compared with those for a circular cylinder at the same Reynolds number. The mean drag coefficient for the wavy cylinder is smaller than that for a corresponding circular cylinder due to the formation of a longer wake vortex generated by the wavy cylinder. The fluctuating lift coefficient of the wavy cylinder is also greatly reduced. This kind of wavy surface leads to the formation of 3-D free shear layers which are more stable than purely 2-D free shear layers. Such free shear layers only roll up into mature vortices at further downstream position and significantly modify the near wake structures and the pressure distributions around the wavy cylinder. Moreover, the simulations in laminar flow condition were also performed to investigate the effect of Reynolds number on force reduction control.
Keywords:wavy cylinder  force reduction  Large Eddy Simulation (LES)  Reynolds number effect
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