Radiation Hydrodynamics

Radiation Hydrodynamics

Principal Collaborators: Jim E. Morel and Jim Warsa (CCS-4)

Our research in Radiation Hydrodynamics is focused on several issues:

Develop material-motion corrections that are appropriate for numerical discretizations.
Develop new discretizations that ensure the equilibrium-diffusion limit, yet are also accurate in optically thin regimes.
Investigate efficient timestepping schemes that use a full nonlinear treatment of all implicit terms, as opposed to linearizations such as operator-splitting. The hope is that much larger timesteps may be taken without sacrificing accuracy.

Relevant Publications

D. A. Knoll, R. B. Lowrie, and J. E. Morel.: Numerical analysis of time integration errors for nonequilibrium radiation diffusion.
Technical Report LA-UR-06-3599, Los Alamos National Laboratory, 2006.
Submitted to Journal of Computational Physics.
R. B. Lowrie and R. M. Rauenzahn.: Shock Wave Solutions for Equilibrium-Diffusion Radiation Hydrodynamics.
Technical Report LA-UR-06-3853, Los Alamos National Laboratory, 2006.
R.B. Lowrie.: A comparison of implicit time integration methods for nonlinear relaxation and diffusion.
Journal of Computational Physics, 196:566-590, 2004.
J.E. Morel, T.A. Wareing, R.B. Lowrie, and D.K. Parsons.: Analysis of ray-effect mitigation techniques.
Nuclear Science and Engineering, 144:1-22, 2003.
R.B. Lowrie, D. Mihalas, and J.E. Morel.: Comoving-frame radiation transport for nonrelativistic fluid velocities.
Journal of Quantitative Spectroscopy & Radiative Transfer, 69(3):291-304, 2001.
R.B. Lowrie and J.E. Morel.: Issues with high-resolution Godunov methods for radiation hydrodynamics.
Journal of Quantitative Spectroscopy & Radiative Transfer, 69(4):475-489, 2001.
J.W. Bates, D.A. Knoll, W.J. Rider, R.B. Lowrie, and V.A. Mousseau.: On consistent time-integration methods for radiation hydrodynamics in the equilibrium diffusion limit: Low-energy-density regime.
Journal of Computational Physics, 167(1):99-130, 2001.
L.H. Auer and R.B. Lowrie.: Dispersion analysis of radiation/thermal fronts with fully resolved spectral opacity variation.
In Nuclear Explosives Code Developers Conference, 2000.
R.B. Lowrie, J.E. Morel, and J.A. Hittinger.: Coupling radiation and hydrodynamics.
Astrophysical Journal, 521(1):432-450, 1999.
R.B. Lowrie and J.E. Morel.: Coupling issues for radiation hydrodynamics.
In Nuclear Explosives Code Developers Conference, 1998.

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