Numerical simulations of shock propagation under strong nonequilibrium conditions

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Abstract

A computational approach is developed to simulate high-enthalpy shock propagation under strong nonequilibrium conditions, such as reentry experiments at NASA’s Electric Arc Shock Tube (EAST) facility. Two-dimensional axisymmetric simulations of EAST flow are performed for Earth reentry at 10 km∕s. An 11-species weakly ionized air model is used to capture the real-gas behavior with reaction rates from the literature. Species mass-diffusion fluxes are calculated assuming a self-consistent effective binary diffusion in conjunction with Gupta–Yos collision integral data. The unsteady, linearized system of conservation laws is solved in a moving frame of reference with active shock tracking to reduce the computational cost by three orders of magnitude relative to that of fixed-frame calculations on a uniform grid. This approach enables time-accurate yet computationally feasible predictions of gas behavior at the test section. Computational fluid dynamics predictions can be compared with the experimental data to gain an improved understanding of the flow physics. Additionally, useful quantities such as boundary-layer thickness and growth rate, and radial variation of gas properties can be computed, which are difficult to measure in experiments.

Original languageEnglish (US)
Pages (from-to)556-569
Number of pages14
JournalJournal of thermophysics and heat transfer
Volume34
Issue number3
DOIs
StatePublished - 2020

Bibliographical note

Funding Information:
This research was sponsored as part of the Entry Systems Modeling project at NASA Ames Research Center. All authors are funded by the research grant to University of Minnesota through contracts 80NSSC18K0211 between NASA and AMA, Inc. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the funding agencies. The authors would like to thank Aaron Brandis, Khalil Bensassi, and Brett Cruden for their feedback during the course of this research. The authors gratefully acknowledge the insight and suggestions provided by Aaron Brandis, Michael Barnhardt, Brett Cruden, and Khalil Bensassi during the progress of this research.

Publisher Copyright:
© 2020 by Durgesh Chandel. Published by the American Institute of Aeronautics and Astronautics, Inc.

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