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 wellpronounced 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:

Soviet Journal of Experimental and Theoretical Physics Letters
 Pub Date:
 August 2008
 DOI:
 10.1134/S0021364008120072
 Bibcode:
 2008JETPL..87..682C
 Keywords:

 05.10.a;
 05.20.y;
 05.40.a;
 47.27.i