On Virk's asymptote

Details On Virk's asymptote On Virk's asymptote

2010-01-11

arxiv.org/abs/1001.1582v1

Physics

Fluid Dynamics

22 pages, 5 figures

Scientific paper

The Virk asymptote is shown to be similar in nature to the Karman buffer layer profile and does not represent a new log-law with a modified mixing-length. It is simply part of the wall layer velocity profile but is extended because of the increase in wall layer thickness in drag reduction flows. The friction factors at the maximum drag reduction asymptote correspond to velocity profiles consisting of a wall layer and a law of the wake sub-region. Maximum drag reduction results in the suppression of the law of the wake and full relaminarisation of the flow.

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