A grey diffusion acceleration method for time-dependent radiative transfer calculation: Analysis and application

Conference · Fri Jan 15 04:00:00 EST 1993

OSTI ID:6607650

Nowak, P F

A grey diffusion acceleration method is presented and is shown by Fourier analysis and test calculations to be effective in accelerating radiative transfer calculations. The spectral radius is bounded by 0.9 for the continuous equations, but is significantly smaller for the discretized equations, especially in the optically thick regimes characteristic to radiation transport problems. The GDA method is more efficient than the multigoup DSA than offset by the much lower method because its slightly higher iteration count is more cost per iteration. A wide range of test calculations confirm the efficiency of GDA compared to multifrequency DSA.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6607650
• Report Number(s): UCRL-JC-111849; CONF-930404--11; ON: DE93009060
• Country of Publication: United States
• Language: English

Related Subjects

663620* -- Physics of Radiations Other Than Neutrons-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
CALCULATION METHODS
DIFFUSION
FOURIER ANALYSIS
ITERATIVE METHODS
MATHEMATICAL LOGIC
NEUTRAL-PARTICLE TRANSPORT
PHOTON TRANSPORT
RADIATION TRANSPORT
TIME DEPENDENCE