An efficient hybrid multi-level CMFD in space and energy for accelerating the high-fidelity neutron transport calculation

Abstract

The high-fidelity neutron transport calculations accelerated by the cell based homogenized multi-group CMFD method still incurs a significant computational burden because its iterations will reduce to a certain number and cannot continue to decrease. To further reduce the iterations of transport calculations, a more efficient hybrid multi-level gCMFD in space and energy method is proposed and implemented in this study. This hybrid multi-level gCMFD acceleration method mainly includes two parts: (1) a new 1/4 cell based homogenized multi-group gCMFD, which is built for directly accelerating the neutron transport calculation; (2) a cell based homogenized one-group gCMFD is used for accelerating 1/4Cell-MG-gCMFD. Then a set of C5G7 benchmark problems are chosen to verify the acceleration performance and the numerical results indicate that the excellent acceleration of the hybrid multi-level gCMFD has achieved.