A parallel implementation of an MHD code for the simulation of mechanically driven, turbulent dynamos in spherical geometry |
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Authors: | K Reuter F Jenko RA Bayliss |
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Affiliation: | a Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany b Department of Physics, University of Wisconsin-Madison, 1150 University Ave., Madison, WI 53706, USA |
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Abstract: | A parallel implementation of a nonlinear pseudo-spectral MHD code for the simulation of turbulent dynamos in spherical geometry is reported. It employs a dual domain decomposition technique in both real and spectral space. It is shown that this method shows nearly ideal scaling going up to 128 CPUs on Beowulf-type clusters with fast interconnect. Furthermore, the potential of exploiting single precision arithmetic on standard x86 processors is examined. It is pointed out that the MHD code thereby achieves a maximum speedup of 1.7, whereas the validity of the computations is still granted. The combination of both measures will allow for the direct numerical simulation of highly turbulent cases (1500<Re<5000), which have been previously impractical, given today's computational speed. |
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Keywords: | 47 65 Md |
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