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DNS of channel flow with two-scale surface roughness on one wall

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We numerically investigate the influence of two-scale surface roughness on turbulent flow with roughness on one wall. The friction Reynolds number is 400. The two-scale surface roughness influences the rms transverse velocity fluctuation over the smooth wall, which is opposite to the rough wall. The intensity of this fluctuation is a key component in producing the Reynolds stress.

Author(s):

Hiroki Suzuki    
Nagoya Institute of Technology
Japan

Richard Perkins    
Ecole Centrale de Lyon
France