Abstract
Ongoing efforts are being made to improve the performance of MPACT as the deterministic neutron transport solver in the Virtual Environment for Reactor Analysis (VERA). As other parts of the code have been improved, the coarse mesh finite difference method (CMFD) has come to take up a significant portion of the runtime. Multilevel-in-energy CMFD and multilevel-in-space CMFD solvers have been used to improve CMFD solver performance. A new multilevel-in-space-and-energy CMFD solver is being introduced that combines components of these two methods. W-Cycles and partial W-Cycles are being investigated to further improve the efficiency of the multilevel-in-energy CMFD solver. The performance of these methods is demonstrated on full core reactor physics problems of interest to VERA.
Highlights
To support the use of the Virtual Environment for Reactor Analysis (VERA), which is being developed by the Consortium for the Advanced Simulation of Light Water Reactors (CASL), development efforts have been devoted to improving the performance of various components of VERA
This paper presents a new multilevel-in-space-and-energy (MLS&E) solver for accelerating the coarse mesh finite difference (CMFD) solution in MPACT
The performance of these multilevel CMFD methods was tested on VERA Progression Problems [14]
Summary
To support the use of the Virtual Environment for Reactor Analysis (VERA), which is being developed by the Consortium for the Advanced Simulation of Light Water Reactors (CASL), development efforts have been devoted to improving the performance of various components of VERA. A multilevel-in-space (MLS) CMFD method was added, with spatial coarsening defined by quarter assembly-collapse and subplane collapse on successive levels [7,8,9] This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). This paper presents a new multilevel-in-space-and-energy (MLS&E) solver for accelerating the CMFD solution in MPACT This method combines the previously mentioned MLE and MLS CMFD capabilities by performing coarsening in both energy and space on each level. The paper will investigate more complex variations of the multigrid cycles in order to further improve the efficiency of each of these multilevel solvers These variations include performing W-cycles and partial W-cycles for cases in which the post-sweep solves are skipped [10,11,12,13].
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