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Effects of high free-stream turbulence on a separated flow field over a two-dimensional hill

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2530
pages 2449-2453

Tomoya Houra
Department of Electronical and Mechanical Engineering, Department of Environmental Technology, Nagoya Institute of Technology, Gokiso-cho, Showa-ки, Nagoya 466-8555, JAPAN

K. Takano
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Masato Tagawa
Department of Electronical and Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, JAPAN

Yasutaka Nagano
Nagoya Industrial Science Research Institute; Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Sinopsis

Experimental investigation has been made on a separated flow field over a two-dimensional hill model with cosine-squared shape. In order to elucidate the effects of free-stream turbulence (FST) on the turbulent characteristics, an active turbulence generating grid (ATG) is installed at the inlet to the test section. By imposing the FST, the size of separation bubble formed behind the hill decreases. In spite of a nearly isotropic turbulence coming into the hill model, the reduction in a cross-correlation coefficient between horizontal and vertical velocity components recovers due to the strong turbulence production in the separated shear layer.

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