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Domain decomposition method for 2d and 3d transport calculations using hybrid mpi/openmp parallelism

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Figure

Figure 1. Description of the cluster
Table I. Estimation of memory occupation by 1 subdomain during scattering source computation in MB  (evaluation for 1488 regions, 3 spatial moments, 6 angular moments)
Figure 3. Elapsed time vs. # of subdomains. The number of power iterations is indicated for each calculation
Figure 5. Description of the a large LWR core (heavy reflector) and the mapping between   subdomains and nodes
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