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BLOCKAGE EFFECT ON FLOWS AROUND A ROTATIONALLY OSCILLATING CIRCULAR CYLINDER  

Kang, Seung-Hee (전북대학교 항공우주공학과, 전북대학교 부설 공학연구원 공업기술연구센터)
Kwon, Oh-Joon (한국과학기술원 항공우주공학과)
Publication Information
Journal of computational fluids engineering / v.13, no.4, 2008 , pp. 33-38 More about this Journal
Abstract
For study on the unsteady blockage effect, flows around a rotationally oscillating circular cylinder with relatively low forcing frequency in closed test-section wind tunnels have been numerically investigated by solving compressible Navier-Stokes equations. The numerical scheme is based on a node-based finite-volume method with the Roe's flux-difference splitting and an implicit time-integration method coupled with dual time-step sub-iteration. The computed results of the oscillating cylinder in the test section showed that the fluctuations of lift and drag are augmented by the blockage effects. The drag further increases because of low base pressure. The pressure on the test section wall shows the harmonics having the oscillating and the shedding frequencies contained in the blockage effect.
Keywords
Unsteady Blockage Effect; Circular Cylinder; Forced Oscillating Cylinder;
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