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http://dx.doi.org/10.5139/JKSAS.2005.33.7.001

Unsteady Wall Interference Effect on Flows around a Circular Cylinder in Closed Test-Section Wind Tunnels  

Kang, Seung-Hee (국방과학연구소)
Kwon, Oh-Joon (한국과학기술원 항공우주공학과)
Hong, Seung-Kyu (국방과학연구소)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.33, no.7, 2005 , pp. 1-8 More about this Journal
Abstract
For study on the unsteady wall interference effect, flows around a circular cylinder 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 showed that the unsteady pressure gradient over the cylinder is enhanced by the wall interference, and as a result the fluctuations of lift and drag are augmented. The drag is further increased because of the lower base pressure. The vortex shedding frequency is also increased by the wall interference. The pressure on the test section wall shows the harmonics having the shedding frequency contained in the wall effect.
Keywords
Unsteady wall interference; Wind tunnel; Circular cylinder;
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