CALCULATED SCALAR DISSIPATION IN TWO-DIMENSIONAL FLOWS.

Abstract

Convection and diffusion of a conserved scalar is calculated in a two-dimensional mixing layer using the discrete vortex method. Scalar dissipation, the square of the scalar gradient, is calculated along various scalar isolines. The dissipation distribution is found to be approximately lognormal with parameters that can be described by a laminar diffusion model which has lognormally-distributed stretching of the mixing layer interface. Refs.