Radiative transfer in decomposed domains
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An efficient algorithm for calculating radiative transfer on massively parallel computers using domain decomposition is presented. The integral formulation of the transfer equation is used to divide the problem into a local but compute-intensive part for calculating the intensity and optical depth integrals, and a nonlocal part for communicating the intensity between adjacent processors. The waiting time of idle processors during the nonlocal communication part does not have a severe impact on the scaling. The wall clock time thus scales nearly linearly with the inverse number of processors.
7 pages, 5 figures, 1 table; substantial improvements; recommended for publication in A&A
7 pages, 5 figures, 1 table; substantial improvements; recommended for publication in A&A