A turbulent boundary layer structure which develop over a k-type rough wall displays several differences with those found on a smooth surface. The magnitude of the wake strength depends on the wall roughness. In the near-wall region, the contribution to the Reynolds shear stress fraction, corresponding to each event, strongly depends on the wall roughness. In the wall region, the diffusion factors are influenced by the wall roughness where the sweep events largely dominate the ejection events. This trend is reversed for the smooth-wall. Particle Image Velocimetry technique (PIV) is used to obtain the fluctuating flow field in the turbulent boundary layer in order to confirm this behavior. The energy budget analysis shows that the main difference between rough- and smooth-walls appears near the wall where the transport terms are larger for smooth-wall. Vertical and longitudinal turbulent flux of the shear stress on both smooth and rough surfaces is compared to those predicted by a turbulence model. The present results confirm that any turbulence model must take into account the effects of the surface roughness.
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March 2002
Technical Papers
Surface Roughness Effects on Turbulent Boundary Layer Structures
L. Keirsbulck,
L. Keirsbulck
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
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L. Labraga,
L. Labraga
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
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A. Mazouz,
A. Mazouz
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
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C. Tournier
C. Tournier
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
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L. Keirsbulck
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
L. Labraga
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
A. Mazouz
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
C. Tournier
Laboratoire de Me´canique et d’Energe´tique, Universite´ de Valenciennes et du Hainaut Cambre´sis, le Mont Houy, B.P.311, 59304 Valenciennes, Cedex France
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division June 5, 2000; revised manuscript received October 15, 2001. Associate Editor: J. Lasheras.
J. Fluids Eng. Mar 2002, 124(1): 127-135 (9 pages)
Published Online: October 15, 2001
Article history
Received:
June 5, 2000
Revised:
October 15, 2001
Citation
Keirsbulck , L., Labraga , L., Mazouz , A., and Tournier, C. (October 15, 2001). "Surface Roughness Effects on Turbulent Boundary Layer Structures ." ASME. J. Fluids Eng. March 2002; 124(1): 127–135. https://doi.org/10.1115/1.1445141
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