DOI: 10.1615/TSFP5
LARGE EDDY SIMULATION OF COMPRESSIBLE TURBULENT MIXING
要約
This paper presents implicit large eddy simulation of compressible turbulent mixing produced by a shock wave passing through a perturbed gas interface. Two different initial conditions are employed, three different grid sizes for each initial condition, and two very high order numerical methods. Solutions are gained which are reasonably grid converged, and approach a quasi self-similar state. It is shown that the choice of initial conditions affect significantly the growth of the turbulent mixing zone, and the plane averaged mixing parameters. The high wavenumber initial perturbation leads to a smoother mean volume fraction profile, and a lower growth rate. Employing low wavenumber perturbations gives a faster growth rate due to the presence of long wavelengths which grow on a longer timescale. The paper discusses further the behaviour of resolved turbulent kinetic energy, kinetic energy spectra, and self-similarity of plane averaged quantities.