Abstract
Using results from previous direct numerical simulations and experiments in the outer region of spatially evolving turbulent boundary layers, we compute the streamwise evolution and the wall-normal variation of the dissipation parameter , namely, the turbulent kinetic energy dissipation rate, normalized by appropriate powers of the local turbulent kinetic energy and integral length scale. For ( is a Reynolds number on the freestream velocity and the local momentum thickness), is essentially constant in the streamwise direction, but varies by up to 50% in the wall-normal direction. For , is additionally found to vary in the streamwise direction and is inversely proportional to the local turbulence Reynolds number .
- Received 8 September 2016
DOI:https://doi.org/10.1103/PhysRevFluids.2.032601
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