HAL CCSD
Coarse Mesh Rebalance Acceleration Applied to an Iterative Domain Decomposition Method on Unstructured Mesh
Odry, N.
Lautard, J.-J.
Vidal, J.-F.
Rimpault, G.
CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
International audience
ISSN: 0029-5639
EISSN: 1943-748X
Nuclear Science and Engineering
Academic Press
cea-02864635
https://cea.hal.science/cea-02864635
https://cea.hal.science/cea-02864635
Nuclear Science and Engineering, 2017, 187 (3), pp.240-253. ⟨10.1080/00295639.2017.1320891⟩
DOI: 10.1080/00295639.2017.1320891
info:eu-repo/semantics/altIdentifier/doi/10.1080/00295639.2017.1320891
en
Coarse mesh rebalance
domain decomposition method
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
info:eu-repo/semantics/article
Journal articles
An iterative domain decomposition method (DDM) is implemented inside the APOLLO3 Sntransport core solver MINARET. Based on a block-Jacobi algorithm, the method inherently suffers a convergencepenalty in terms of both computing time and number of iterations. An acceleration method has to bedeveloped in order to overcome this difficulty. This paper investigates a nonlinear coarse mesh rebalance (CMR)method that favors the way information propagates through the core when domain decomposition is used. Thefundamental idea involves updating each subdomain boundary condition thanks to a core-sized low-ordercalculation on a coarse spatial mesh. The numerical convergence is sped up. Performances are meeting theexpectations since the CMR acceleration systematically succeeds in overbalancing the domain decompositionadditional cost. The aim of such a DDM + CMR algorithm is eventually to introduce more parallelism whensolving the spatial transport equation. Nevertheless, parallel computing is not addressed in this paper.
2017-07-31