Reconstruction and Parallelization of 3D SN Program for Neutron/Photon Transport

The application of the neutron/photon transport simulation program based on 3D SN method is limited by the intensive computational requirement and prohibitive computational time. Based on the geometry domain partition method, this paper reports our efforts on the reconstruction and parallelization of the legacy SN program by redesigning the data structures, the functional module as well as the compute flow on J Adaptive Structured Meshes applications Infrastructure（JASMIN）. The correctness of the reconstructed program is proved by modeling the fixed-source and k-eigenvalue benchmark problems. In the strong scalability test, the parallel efficiency of the reconstructed program can reach up to 37.07% on 512 CPU cores when modeling the k-eigenvalue problem with 100 million degree-of-freedom.