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Title: The Radiation Transport Conundrum in Radiation Hydrodynamics

The summary of this paper is: (1) The conundrum in the title is whether to treat radiation in the lab frame or the comoving frame in a radiation-hydrodynamic problem; (2) Several of the difficulties are associated with combining a somewhat relativistic treatment of radiation with a non-relativistic treatment of hydrodynamics; (3) The principal problem is a tradeoff between easily obtaining the correct diffusion limit and describing free-streaming radiation with the correct wave speed; (4) The computational problems of the comoving-frame formulation in more than one dimension, and the difficulty of obtaining both exact conservation and full u/c accuracy argue against this method; (5) As the interest in multi-D increases, as well as the power of computers, the lab-frame method is becoming more attractive; and (6) The Monte Carlo method combines the advantages of both lab-frame and comoving-frame approaches, its only disadvantage being cost.
Authors:
Publication Date:
OSTI Identifier:
15015921
Report Number(s):
UCRL-CONF-210717
TRN: US200509%%435
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Astrophysical Fluid Dynamics, Los Angeles, CA (US), 04/04/2005--04/09/2005; Other Information: PBD: 18 Mar 2005
Research Org:
Lawrence Livermore National Lab., Livermore, CA (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; ACCURACY; COMPUTERS; DIFFUSION; HYDRODYNAMICS; MONTE CARLO METHOD; RADIATION TRANSPORT; RADIATIONS; VELOCITY