Multilevel-in-Space-and-Energy CMFD in VERA

Cornejo, Luke; Collins, Benjamin S.; Stimpson, Shane G.; Graham, Aaron

doi:10.1080/00295639.2021.1877503

Multilevel-in-Space-and-Energy CMFD in VERA

Journal Article · Thu Mar 18 00:00:00 EDT 2021 · Nuclear Science and Engineering

DOI:https://doi.org/10.1080/00295639.2021.1877503· OSTI ID:1813262

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

For full-core modeling in the Virtual Environment for Reactor Analysis (VERA), the three-dimensional multigroup eigenvalue neutron transport problem is solved by MPACT. To improve the efficiency of MPACT, advancements have been made in the transport accelerator. Multilevel-in-energy and multilevel-in-space coarse mesh finite difference (CMFD) solvers were developed to improve the efficiency of the CMFD accelerator. In this paper a new multilevel-in-space-and-energy CMFD solver is developed with coarsening in both space and energy on every level. Several different strategies are investigated for coarsening groups in energy. Modified V-cycle and multiple-cycle algorithms are evaluated for solving the multilevel equations. The performance of these solvers is compared for typical full-core reactor physics problems.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1813262

Journal Information:: Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 8 Vol. 195; ISSN 0029-5639

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

References (14)

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42 ENGINEERING
CMFD
MPACT
Multilevel
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multigrid

Multilevel-in-Space-and-Energy CMFD in VERA

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