Numerical Studies of Shock Wave Structure Sensitivity to Interactions with Turbulent Fields

摘要

The paper concerns the observed random changes to velocity, density, temperature, and pressure distributions induced in shock waves when weak shocks interact with relatively intense turbulence. Here numerical procedures are applied in order to examine this interaction process and to simulate its influence on turbulence. This interaction may be used as a diagnostic for ascertaining the distribution of interaction energy between competitive acoustic, entropy and vortical modes. Numerical procedures used here are supplements to physical experiments for tracking the dynamical mechanisms which may control the evolution of shock-turbulence interaction. The results are intended to provide assistance in the development and refinement of compressible turbulent closure models. They are obtained from use of a mixed Eulerian-Lagrangian semicontinuous rezoning finite difference method, a hybrid Euler/Lagrange pseudospectral method, and a Monte-Carlo random-choice procedure. The latter effectively magnifies the shock front region through use of finite range shock-transition integrals generating simulated interactive transition profiles. 11 refs., 6 figs.