Three-dimensional radiative transfer on a massively parallel computer

Details Three-dimensional radiative transfer on a massively parallel computer Three-dimensional radiative transfer on a massively parallel computer

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..319v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. 319-330

Computer Science

Numerical Analysis

14

Local Thermodynamic Equilibrium, Massively Parallel Processors, Numerical Analysis, Radiative Transfer, Stellar Atmospheres, Three Dimensional Models, Cartesian Coordinates, Periodic Functions, Spatial Distribution, Thermal Environments

Scientific paper

We perform 3D radiative transfer calculations in non-local thermodynamic equilibrium (NLTE) in the simple two-level atom approximation on the Mas-Par MP-1, which contains 8192 processors and is a single instruction multiple data (SIMD) machine, an example of the new generation of massively parallel computers. On such a machine, all processors execute the same command at a given time, but on different data. To make radiative transfer calculations efficient, we must re-consider the numerical methods and storage of data. To solve the transfer equation, we adopt the short characteristic method and examine different acceleration methods to obtain the source function. We use the ALI method and test local and non-local operators. Furthermore, we compare the Ng and the orthomin methods of acceleration. We also investigate the use of multi-grid methods to get fast solutions for the NLTE case. In order to test these numerical methods, we apply them to two problems with and without periodic boundary conditions.

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