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

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) reduce computational cost. code RELAP5-MOD3.3 and ROM of finite volume OpenFOAM are partitioned domain decomposition coupling algorithm using an implicit scheme. velocity transported over boundary interface is imposed in penalty method. models evaluated on open closed pipe flow configurations. results simulations close those solver. Also for new parameter sets, RELAP5/ROM capable predicting RELAP5/CFD good accuracy. Finally, 3–5 times faster than