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ISSN オンライン: 2642-0554

QUADRANT ANALYSIS OF ROUGH AND SMOOTH SURFACE CHANNEL FLOWS

O.M. Bakken
Dept. of Mechanics, Thermo and Fluid Dynamics Norwegian University of Science and Technology N-7491 Trondheim, Norway

Per-Age Krogstad
Department of Energy and Process Engineering, Norwegian University of Science and Technology N-7491 Trondheim, Norway

要約

A comparison between the turbulent flows in a smooth and rough wall channel are reported. It is demonstrated that even though the outer layer may appear to be unaffected by the surface condition, since the mean velocity defect profiles are identical, significant modifications to the turbulent stresses as far out as y/h~ 0.4 are found. Inside this limit the contributions from the fourth quadrant are found to be much more dominant in the rough case than over the smooth wall, confirming earlier findings that surface roughness tends to stimulate sweep type of motions.