On the diffusion of passive impurities in random flows

V.R. Chechetkin, V.S. Lutovinov and A.A. Samokhin

Physica A: Statistical Mechanics and its Applications, 1991, vol. 175, issue 1, 87-113

Abstract: The theory with high-order velocity cumulants (non-Gaussian statistics) for the problem of turbulent diffusion is considered. The higher velocity cumulants play an important role in the case of Kolmogorov turbulence and are of fundamental interest in the problem of the turbulent dynamo. In the reduced quasi-Gaussian approximation our results are compared with those obtained by the other authors. Both one-and two-particle turbulent transports are discussed. We give the estimate of the Obukhov-Corrsin constant for the stationary structure function of concentration fluctuations. It is also shown that for Komogorov turbulence the negative correction to purely convective transport for the one-particle turbulent diffusion at short times has an exponent equal to 83 rather than 3, as has been suggested earlier.

Date: 1991
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:175:y:1991:i:1:p:87-113

DOI: 10.1016/0378-4371(91)90270-M

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