MOC Efficiency Improvements Using a Jacobi Inscatter Approximation
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
In recent weeks, attention has been given to resolving the convergence issues encountered with TCP0 by trying a Jacobi (J) inscatter approach when group sweeping, where the inscatter source is constructed using the previous iteration flux. This is in contrast to a Gauss-Seidel (GS) approach, which has been the default to-date, where the scattering source uses the most up-to-date flux values. The former is consistent with CASMO, which has no issues with TCP0 convergence. Testing this out on a variety of problems has demonstrated that the Jacobi approach does indeed provide substantially more stability, though can take more outer iterations to converge. While this is not surprising, there are improvements that can be made to the MOC sweeper to capitalize on the Jacobi approximation and provide substantial speedup. For example, the loop over groups, which has traditionally been the outermost loop in MPACT, can be moved to the interior, avoiding duplicate modular ray trace and coarse ray trace setup (mapping coarse mesh surface indexes), which needs to be performed repeatedly when group is outermost.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Consortium for Advanced Simulation of LWRs (CASL)
- Sponsoring Organization:
- USDOE Office of Nuclear Energy (NE)
- Contributing Organization:
- Univ. of Michigan, Ann Arbor, MI (United States)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1325480
- Report Number(s):
- ORNL/TM-2016/406; CASL-U-2016-1056-002; NT0304000; NEAF343; CASL-U-2016-1056-002; TRN: US1700079
- Country of Publication:
- United States
- Language:
- English
Similar Records
Implementation of a Red-Black SOR CMFD Solver in MPACT
Implementation of CMFD Acceleration Scheme in PROTEUS-MOC