DNS of high temperature effects on compressible isotropic turbulence

High temperature effects on homogeneous decaying isotropic turbulence are studied using Direct Numerical Simulations (DNS). A Fourier-spectral compressible flow solver is developed for the purpose. To account for the high temperature effects, a local thermodynamic equilibrium based physical model for air is suggested. At high temperatures, both thermodynamic and transport properties of air are found to be significantly different from those predicted using a calorically perfect gas model. The effects of these properties on evolution of turbulent statistics are studied and comparisons are made with a calorically perfect gas model. Budgets are computed for turbulent kinetic energy and enstrophy to explain the results obtained using the high temperature model.