Multi-Fidelity Modeling Framework for Radiative Transfer in Hypersonic Atmospheric Entry

This work aims to construct a multi-fidelity modeling framework for radiative transfer in hypersonic environment and its applications. Analyses of the radiation phenomena in such extreme conditions require covering a wide range of physical aspects, including coupling with other physics, such as high-enthalpy flows and electromagnetism, for completeness of the investigation. This requirement has been achieved by constructing a numerical toolbox, MURP (MUlti-fidelity Radiation Package), through the present work. The proposed framework offers non-gray and non-equilibrium gaseous radiative transport analysis capability with various levels of fidelity ranging from a one-dimensional tangent-slab method to multi-dimensional finitevolume treatments, while the spectral properties, such as absorption and emission coefficients of gas mixtures, are calculated by either a line-by-line method or reduced-order spectral models. The developed framework is then applied to hypersonic atmospheric entry cases, including the FIRE II and Dragonfly flight missions and the ground testing facility of an inductively coupled plasma torch. The applications reveal the impact of the radiation coupling while validating the framework’s accuracy by reproducing reference data.