Dependence of the non-stationary form of Yaglom's equation on the Schmidt number

Title: Dependence of the non-stationary form of Yaglom's equation on the Schmidt number
Creator: Orlandi, P.; Antonia, R. A.
Relation: Journal of Fluid Mechanics Vol. 451, p. 99-108
Publisher Link: http://dx.doi.org/10.1017/S0022112001006723
Publisher: Cambridge University Press
Resource Type: journal article
Date: 2002
Description: The dynamic equation for the second-order moment of a passive scalar increment is investigated in the context of DNS data for decaying isotropic turbulence at several values of the Schmidt number Sc, between 0.07 and 7. When the terms of the equation are normalized using Kolmogorov and Batchelor scales, approximate independence from Sc is achieved at sufficiently small r/ηB (r is the separation across which the increment is estimated and ηB is the Batchelor length scale). The results imply approximate independence of the mixed velocity-scalar derivative skewness from Sc and underline the importance of the non-stationarity. At small r/ηB, the contribution from the non-stationarity increases as Sc increases.
Subject: Yaglom's equation; Schmidt number; passive scalar increment; decaying isotropic turbulence; Kolmogorov scale; Batchelor scale
Identifier: http://hdl.handle.net/1959.13/33290
Identifier: uon:3137
Identifier: ISSN:0022-1120
Language: eng
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