Nonequilibrium and Reactive High-Speed Flow Simulations with a Fifth-Order WENO Scheme

Abstract

For high-speed flow over blunt bodies, gas temperature increases dramatically. As a result, gas molecules start dissociating, and vibration and electron energy modes are being excited. Gas becomes thermally nonequilibrium and chemically reactive. Effects of vibration and electron energy excitations, translation-vibration energy relaxation, and chemical reactions among different species need to be considered in numerical simulations. In current paper, a CFD solver based on a fifth-order WENO scheme is developed for the simulation of nonequilibrium and reactive high-speed flows, as part of the ADPDIS3D computer code package. The code is implemented based on a two-temperature model. It is assumed that translation and rotation energy modes are in equilibrium at the translation temperature whereas vibration and electron energy modes are in equilibrium at the vibration temperature. The code is validated and applied to numerical simulations of hypersonic nonequilibrium flows.