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Implementation of Radiation, Ablation, and Free Energy Minimization Modules for Coupled Simulations of Hypersonic FlowA description of models and boundary conditions required for coupling radiation and ablation physics to a hypersonic flow simulation is provided. Chemical equilibrium routines for varying elemental mass fraction are required in the flow solver to integrate with the equilibrium chemistry assumption employed in the ablation models. The capability also enables an equilibrium catalytic wall boundary condition in the non-ablating case. The paper focuses on numerical implementation issues using FIRE II, Mars return, and Apollo 4 applications to provide context for discussion. Variable relaxation factors applied to the Jacobian elements of partial equilibrium relations required for convergence are defined. Challenges of strong radiation coupling in a shock capturing algorithm are addressed. Results are presented to show how the current suite of models responds to a wide variety of conditions involving coupled radiation and ablation.
Document ID
20090007606
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Gnoffo, Peter A. (NASA Langley Research Center Hampton, VA, United States)
Johnston, Christopher O. (NASA Langley Research Center Hampton, VA, United States)
Thompson, Richard A. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 24, 2013
Publication Date
January 5, 2009
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
AIAA-Paper-2009-1399
LF99-7110
Meeting Information
Meeting: 47th AIAA Aerospace Sciences Meeting and Exhibit
Location: Orlando, FL
Country: United States
Start Date: January 5, 2009
End Date: January 8, 2009
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 599489.02.07.07.04.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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