Results of numerical simulation of a jet spreading on a surface of denser liquid are obtained using second-moment closure (SMC) turbulent transfer models. Action of stable stratification and a free surface on turbulence is taken into account by the non-linear pressure-strain approximation in a modified SMC model. This model gives, on the whole, better agreemetn with experimental data than standard algebraic and differential SMC models. The Eulerian turbulent diffusion model is used for prediction of the concentration field of passive contaminant emitted from a ground source in the turbulent boundary layer. The results of modelling reproduce well the structural features of the concentration field transformation observed in measurements. Diffusion of passive scalar from a line source in a flow behind a backward-facing step is investigated.
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