Twodimensional turbulent diffusion
Abstract
The problem of convective transport in a twodimensional incompressible unsteady flow is considered, with special attention given to the lowfrequency asymptotic behavior when the frequency of the velocity field is much lower than that of the particle motion in the flow. The problem that arises as a consequence; i.e., the problem regarding the statistical properties of the random function isolines, is solved using percolation theory. Asymptotic behaviors of the turbulent diffusion coefficient and of the Kolmogorov entropy are investigated analytically. An interpolation formula for the turbulent diffusion coefficient, which accounts for low molecular diffusion, is developed.
 Publication:

Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
 Pub Date:
 February 1990
 Bibcode:
 1990ZhETF..97..476G
 Keywords:

 Convective Flow;
 Incompressible Flow;
 Stochastic Processes;
 Turbulent Diffusion;
 Two Dimensional Flow;
 Flow Geometry;
 Flow Velocity;
 Low Frequencies;
 Particle Motion;
 Unsteady Flow;
 Fluid Mechanics and Heat Transfer