This article is cited in 17 papers

PLASMA, GASES

Passive scalar structures in peripheral regions of random flows

A. Chernykh^ab, V. Lebedev<sup>c

a</sup> Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
^b Novosibirsk State University, Novosibirsk, 630090, Russia
^c Landau Institute for Theoretical Physics, Russian Academy of Sciences, Moscow, 117334, Russia

Abstract: We investigate statistical properties of the passive scalar near walls in random flows assuming weakness of its diffusion. Then at advanced stages of the passive scalar mixing its unmixed residue is concentrated in a narrow diffusive layer near the wall. We conducted numerical simulations and revealed structures responsible for the passive scalar transport to bulk, they are passive scalar tongues pulled from the diffusive boundary layer. The passive scalar integrated along the wall possesses well pronounced scaling behavior. We propose an analytical scheme giving exponents of the integral passive scalar moments, the exponents agree reasonably with numerics in $3d$.

PACS: 05.10.-a, 05.20.-y, 05.40.-a, 47.27.-i

Received: 15.05.2008

Language: English

 English version: Journal of Experimental and Theoretical Physics Letters, 2008, 87:12, 682–686

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