Uncertainty quantification in steady state simulations of a molten salt system using polynomial chaos expansion analysis

Santanoceto, M.; Tiberga, M.; Perko, Z.; Dulla, S.; Lathouwers, D.

Uncertainty Quantification (UQ) of numerical simulations is highly relevant in the study and design of complex systems. Among the various approaches available, Polynomial Chaos Expansion (PCE) analysis has recently attracted great interest. It belongs to nonintrusive spectral projection methods and consists of constructing system responses as polynomial functions of the stochastic inputs. The limited number of required model evaluations and the possibility to apply it to codes without any modification make this technique extremely attractive. In this work, we propose the use of PCE to perform UQ of complex, multi-physics models for liquid fueled reactors, addressing key design aspects of neutronics and thermal fluid dynamics. Our PCE approach uses Smolyak sparse grids designed to estimate the PCE coefficients. To test its potential, the PCE method was applied to a 2D problem representative of the Molten Salt Fast Reactor physics. An in-house multi-physics tool constitutes the reference model. The studied responses are the maximum temperature and the effective multiplication factor. Results, validated by comparison with the reference model on 103 Monte-Carlo sampled points, prove the effectiveness of our PCE approach in assessing uncertainties of complex coupled models.

Uncertainty quantification in steady state simulations of a molten salt system using polynomial chaos expansion analysis / Santanoceto, M.; Tiberga, M.; Perko, Z.; Dulla, S.; Lathouwers, D.. - ELETTRONICO. - (2020). ((Intervento presentato al convegno International Conference PHYSOR 2020: Transition to a Scalable Nuclear Future tenutosi a Cambridge nel March 2020.

Titolo:	Uncertainty quantification in steady state simulations of a molten salt system using polynomial chaos expansion analysis
Autori:	SANTANOCETO, MARIO M. Tiberga Z. Perko DULLA, SANDRA D. Lathouwers mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2020
Abstract:	Uncertainty Quantification (UQ) of numerical simulations is highly relevant in the study and desi...gn of complex systems. Among the various approaches available, Polynomial Chaos Expansion (PCE) analysis has recently attracted great interest. It belongs to nonintrusive spectral projection methods and consists of constructing system responses as polynomial functions of the stochastic inputs. The limited number of required model evaluations and the possibility to apply it to codes without any modification make this technique extremely attractive. In this work, we propose the use of PCE to perform UQ of complex, multi-physics models for liquid fueled reactors, addressing key design aspects of neutronics and thermal fluid dynamics. Our PCE approach uses Smolyak sparse grids designed to estimate the PCE coefficients. To test its potential, the PCE method was applied to a 2D problem representative of the Molten Salt Fast Reactor physics. An in-house multi-physics tool constitutes the reference model. The studied responses are the maximum temperature and the effective multiplication factor. Results, validated by comparison with the reference model on 103 Monte-Carlo sampled points, prove the effectiveness of our PCE approach in assessing uncertainties of complex coupled models.
Appare nelle tipologie:	4.1 Contributo in Atti di convegno

File in questo prodotto:

File	Descrizione	Tipologia	Licenza
CP 86 - PHYSOR2020 Chaos MSR.pdf		2a Post-print versione editoriale / Version of Record	PUBBLICO - Tutti i diritti riservati	Visibile a tuttiVisualizza/Apri

Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/11583/2848685

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

PORTO @ Archivio Istituzionale della Ricerca

File in questo prodotto: