SAMANTA, Devranjan; INGREMEAU, François; CERBUS, Rory; TRAN, Tuan; GOLDBURG, Walter I.; CHAKRABORTY, Pinaki; KELLAY, Hamid

doi:10.1103/PhysRevLett.113.024504

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SAMANTA, Devranjan
Okinawa Institute of Science and Technology

INGREMEAU, François
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

CERBUS, Rory
Okinawa Institute of Science and Technology
Department of Physics and Astronomy [Pittsburgh]

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Physical Review Letters. 2014-07-09, vol. 113, n° 2, p. 024504 (1-5)

American Physical Society

Résumé en anglais

The law of the wall and the log law rule the near-wall mean velocity profile of three-dimensional turbulent flows. These well-known laws, which are validated by legions of experiments and simulations, may be universal. Here, using a soap-film channel, we report the first experimental test of these laws in quasi-two-dimensional turbulent channel flows under two disparate turbulent spectra. We find that despite the differences with three-dimensional flows, the laws prevail, albeit with notable distinctions: the two parameters of the log law are markedly distinct from their three-dimensional counterpart; further, one parameter (the von Kármán constant) is independent of the spectrum whereas the other (the offset of the log law) depends on the spectrum. Our results suggest that the classical theory of scaling in wall-bounded turbulence is incomplete wherein a key missing element is the link with the turbulent spectrum.< Réduire

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(47.27.nd) Channel flow

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Scaling of Near-Wall Flows in Quasi-Two-Dimensional Turbulent Channels

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