The work is devoted to direct numerical simulation of
turbulent mixing by shear driven instability at an interface
of two plane-parallel gas flows. The work presents the
results obtained in 2D simulations of turbulence being
developed at the interface of two almost incompressible
gases using the MAX program package. Spatial and temporal
evolution of the turbulence zone resulted from shear driven
instability is studied. We calculated the constant of shear
driven turbulence mixing and investigated how the rate
of turbulence zone growth depended on density difference
of mixed fluids. Heterogeneity coefficient of the mixture
was calculated for all considered density differences.