Development of a coupling between a system thermal–hydraulic code and a reduced order CFD model

Research output: Contribution to journalArticle

Institutes & Expert groups

  • UGent - Universiteit Gent
  • UniPi - Università di Pisa

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Abstract

The nuclear community has coupled several three-dimensional Computational Fluid Dynamics (CFD) solvers with one-dimensional system thermal–hydraulic (STH) codes. This work proposes to replace the CFD solver by a reduced order model (ROM) to reduce the computational cost. The system code RELAP5-MOD3.3 and a ROM of the finite volume CFD solver OpenFOAM are coupled by a partitioned domain decomposition coupling algorithm using an implicit coupling scheme. The velocity transported over a coupling boundary interface is imposed in the ROM using a penalty method. The coupled models are evaluated on open and closed pipe flow configurations. The results of the coupled simulations with the ROM are close to those with the CFD solver. Also for new parameter sets, the coupled RELAP5/ROM models are capable of predicting the coupled RELAP5/CFD results with good accuracy. Finally, coupling with the ROM is 3–5 times faster than coupling with the CFD solver.

Details

Original languageEnglish
Article number108056
Number of pages16
JournalAnnals of nuclear energy
Volume153
DOIs
Publication statusPublished - Apr 2021

Keywords

  • Code coupling, Computational fluid dynamics, Reduced order modeling, Proper Orthogonal Decomposition (POD), Galerkin projection, Boundary control

ID: 7057540