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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

EFFECTS OF REYNOLDS NUMBER AND ADVERSE PRESSURE GRADIENT ON A TURBULENT BOUNDARY LAYER DEVELOPING ON A ROUGH SURFACE

pages 47-52
DOI: 10.1615/TSFP5.70
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要約

A detailed experimental study of turbulent boundary layers developing over rough surfaces and submitted to both zero and adverse pressure gradient was undertaken. Two surface roughness characterized by distributed random elements have been chosen. The boundary layer was probed with a single hot wire in order to get mean and turbulent quantities. Skin friction coefficient was obtained from the semi-logarithmic profiles of the mean velocity, using laws of the wall.
The emphasis of this work is on the dependency of the "equivalent sand roughness" upon the pressure gradient and the Reynolds number. It was pointed out that both the roughness topology and the nature of flow had to be taken into account when the equivalent sand roughness concept was needed.

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