2013•The Proceedings of the International Conference on Jets Wakes and Separated Flows (ICJWSF)Open access

1219 THE EFFECTS OF A CYLINDER WAKE IN A FREESTREAM ON A FLAT PLATE TURBULENT BOUNDARY LAYER

Takao TAKIZAKI, HIRUTA Kosuke, Kouji Nagata, Yasuhiko SAKAI, Osamu TERASHIMA, Ito Y

Abstract

Effects of the cylinder wake in a freestream on statistical properties of a turbulent boundary layer over a flat plate are investigated experimentally by using a wind tunnel. The cylinder is installed horizontally above the tripping wire and the effects of its wake on the zero-pressure-gradient turbulent boundary layer are investigated. The results show that the logarithmic law for the time-averaged mean velocity is still applicable for the turbulent boundary layer interacted with the cylinder wake. However, the turbulent intensities in the outer region (y+ > 500) and the Reynolds shear stress in the entire region of the boundary layer are decreased by the cylinder wake.

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Key concepts: Freestream, Wake, Boundary layer, Boundary layer thickness, Turbulence, Mechanics, Wind tunnel, Physics