Turbulence statistics in rotating channel flows with rough walls |
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| Affiliation: | 1. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, USA;2. Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario, K7L 3N6, Canada;3. Department of Mechanical Engineering, Michigan State University, East Lansing, MI, USA |
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| Abstract: | We performed direct simulations of channel flow subjected to rotation about a spanwise axis, comparing cases with smooth and rough walls. The destabilizing effect of roughness counteracts the stabilizing effect of rotation on the cyclonic (stable) side. When the surface is rough the Reynolds stresses remain significant at all rotation rates considered, even those that results in a quasi-laminar state when the wall is smooth. The wake fluctuations result in significant dispersive stresses, which give an important contribution to the generation of turbulence on the stable side, mainly through added production of shear stresses. The dispersive stresses are mostly associated with the channeling of the flow between roughness elements. |
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