Archivio Istituzionale della RicercaWe present the velocity profile measured within a porous bed below rough turbulent open channel flow. Mean streamwise velocity has a minimum in the top pore, just below the bed surface, and then increases towards a constant value in the deeper pores. We argue that the velocity minimum in the top pore is due to enhanced turbulence generated within the external flow. This produces a flow regime similar to rough turbulent pipe flow, with very efficient momentum extraction. In the deeper pores turbulence intensities are damped so that momentum extraction is less efficient, allowing higher mean velocities to develop.
Peculiar mean velocity profiles within a porous bed of an open channel / Pokrajac, D; Manes, Costantino; Mcewan, Ik. - In: PHYSICS OF FLUIDS. - ISSN 1070-6631. - 19:9(2007). [10.1063/1.2780193]
Peculiar mean velocity profiles within a porous bed of an open channel
MANES, COSTANTINO;
2007
Abstract
We present the velocity profile measured within a porous bed below rough turbulent open channel flow. Mean streamwise velocity has a minimum in the top pore, just below the bed surface, and then increases towards a constant value in the deeper pores. We argue that the velocity minimum in the top pore is due to enhanced turbulence generated within the external flow. This produces a flow regime similar to rough turbulent pipe flow, with very efficient momentum extraction. In the deeper pores turbulence intensities are damped so that momentum extraction is less efficient, allowing higher mean velocities to develop.
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https://hdl.handle.net/11583/1897513
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