Implicit Monte Carlo methods and non-equilibrium Marshak wave radiative transport

Conference · Tue Jan 01 00:00:00 EST 1985

DOI:https://doi.org/10.1007/BFb0049039· OSTI ID:5698521

Lynch, J E

Two enhancements to the Fleck implicit Monte Carlo method for radiative transport are described, for use in transparent and opaque media respectively. The first introduces a spectral mean cross section, which applies to pseudoscattering in transparent regions with a high frequency incident spectrum. The second provides a simple Monte Carlo random walk method for opaque regions, without the need for a supplementary diffusion equation formulation. A time-dependent transport Marshak wave problem of radiative transfer, in which a non-equilibrium condition exists between the radiation and material energy fields, is then solved. These results are compared to published benchmark solutions and to new discrete ordinate S-N results, for both spatially integrated radiation-material energies versus time and to new spatially dependent temperature profiles. Multigroup opacities, which are independent of both temperature and frequency, are used in addition to a material specific heat which is proportional to the cube of the temperature. 7 refs., 4 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5698521
• Report Number(s): LA-UR-85-1261; CONF-8504110-14; ON: DE85010711
• Resource Relation: Journal Volume: 240; Conference: Joint Los Alamos/CEA meeting on Monte Carlo methods, Cadarache, France, 22 Apr 1985; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ENERGY TRANSFER
RADIATIVE CORRECTIONS
MARSHAK BOUNDARY CONDITIONS
MONTE CARLO METHOD
PHOTON TRANSPORT
BOUNDARY CONDITIONS
CORRECTIONS
NEUTRAL-PARTICLE TRANSPORT
RADIATION TRANSPORT
654001* - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments