The theory for the time step control has been developed and implemented in the PHISICS/RELAP5-3D© coupled code resulting in three different methodologies and two different ways to define the tolerance. More than 2,000 lines have been added to the PHISICS code and to the RELAP5-3D© interface. The three methodologies have been successfully tested on a simplified model of the Japanese HTTR, obtaining a good speedup while maintaining the relative error for the total power under 1 %. The best methodology for this model seems to be methodology #2 with a flux relative local tolerance of 1e-5. This method allows a speedup factor of 5 with a maximum relative error under 0.3%.
Improvements to PHISICS/RELAP5-3D© capabilities for simulating HTGRs / Balestra, Paolo; Alfonsi, Andrea; Strydom, Gerhard; Rabiti, Cristian; Giannetti, Fabio; Caruso, Gianfranco. - In: TRANSACTIONS OF THE AMERICAN NUCLEAR SOCIETY. - ISSN 0003-018X. - STAMPA. - 116:(2017), pp. 1009-1012. (Intervento presentato al convegno 2017 Transactions of the American Nuclear Society, ANS 2017 tenutosi a Hyatt Regency San Francisco, USA nel 2017).
Improvements to PHISICS/RELAP5-3D© capabilities for simulating HTGRs
Balestra, Paolo;Alfonsi, Andrea;Giannetti, Fabio;Caruso, Gianfranco
2017
Abstract
The theory for the time step control has been developed and implemented in the PHISICS/RELAP5-3D© coupled code resulting in three different methodologies and two different ways to define the tolerance. More than 2,000 lines have been added to the PHISICS code and to the RELAP5-3D© interface. The three methodologies have been successfully tested on a simplified model of the Japanese HTTR, obtaining a good speedup while maintaining the relative error for the total power under 1 %. The best methodology for this model seems to be methodology #2 with a flux relative local tolerance of 1e-5. This method allows a speedup factor of 5 with a maximum relative error under 0.3%.File | Dimensione | Formato | |
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