Passive scalar structures in peripheral regions of random flows
Abstract
The statistical properties of the passive scalar near walls in random flows assuming a weakness of its diffusion have been investigated. Then, at advanced stages of the passive scalar mixing, its unmixed residue is concentrated in a narrow diffusive layer near the wall. The numerical simulations have revealed the structures responsible for the passive scalar transport to the bulk; these are passive scalar tongues pulled from the diffusive boundary layer. The passive scalar integrated along the wall possesses a well-pronounced scaling behavior. An analytical scheme, giving exponents of the integral passive scalar moments has been proposed. The exponents reasonably agree with the calculations in 3 d.
- Publication:
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Soviet Journal of Experimental and Theoretical Physics Letters
- Pub Date:
- August 2008
- DOI:
- 10.1134/S0021364008120072
- Bibcode:
- 2008JETPL..87..682C
- Keywords:
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- 05.10.-a;
- 05.20.-y;
- 05.40.-a;
- 47.27.-i