A 3D numerical study of the turbulent phase of
the evolution of Rayleigh–Taylor instability (RTI)
was undertaken using the MAH-3 code. A criterion and a
technique have been developed that can be used for diagnostics
in computational experiments studying flow transition to
self-similar turbulence. It has been found that a criterion
of the flow transition to the self-similar turbulence is
Kolmogorov's self-similar distribution of the turbulent
kinetic energy together with the square law of mixing zone
extension. The technique is based on the analysis of the
evolution of the dimensionless power spectrum of specific
kinetic energy. Three phases of nonlinear mixing are found:
“relict chaos”, “formation of classical
energy spectrum” and “spectrum degradation.”
Determination of a proportionality factor for a square
law within the time range incorporating inertial interval
gives the value of α ≈ 0.07.
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.
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