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http://dx.doi.org/10.5407/jksv.2019.17.3.012

Turbulent plane Couette-Poiseuille flow over a 2-D rod-roughened wall  

Kim, Jeong Hyun (Department of Mechanical Engineering, UNIST)
Lee, Young Mo (Department of Mechanical Engineering, UNIST)
Lee, Jae Hwa (Department of Mechanical Engineering, UNIST)
Publication Information
Journal of the Korean Society of Visualization / v.17, no.3, 2019 , pp. 12-18 More about this Journal
Abstract
Direct numerical simulation of a fully developed turbulent plane Couette-Poiseuille flow with a two-dimensional (2-D) rod-roughened wall is performed to investigate the impacts of the surface roughness. It is shown that the logarithmic region in the mean velocity profile over the rough wall Couette-Poiseuille flow is significantly shortened by the surface roughness compared to that over a turbulent Couette-Poiseuille flow with smooth wall. The Reynolds shear stress over the rough wall Couette-Poiseuille flow is decreased compared to that for a smooth case in the outer layer. These results are attributed to weakened turbulence activity or roll-cell mode over the rough wall Couette-Poiseuille flow near the channel centerline due to suppressed development of u'-structure on the top wall, as documented through spanwise energy spectra of the streamwise velocity fluctuations. Inspection of congregation motion near the bottom wall and time evolution of u'-structure reveal weakened co-supporting cycle for the rough wall case.
Keywords
Couette-Poiseuille flow; Roughness; Large-scale motions; Co-supporting cycle;
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