A grey diffusion acceleration method for time-dependent radiative transfer calculation: Analysis and application
Conference
·
OSTI ID:10145647
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:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10145647
- Report Number(s):
- UCRL-JC--111849; CONF-930404--11; ON: DE93009060
- Country of Publication:
- United States
- Language:
- English
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