Development of a CFD – LES model for the dynamic analysis of the DYNASTY natural circulation loop

Natural circulation is exploited in nuclear systems to passively remove power case of accident scenarios. In this regard, the DYNASTY experimental facility at Politecnico di Milano has been setup increase knowledge on single-phase, buoyancy-driven presence distributed heating. paper, development a computational fluid dynamics (CFD) model presented, focusing capability CFD assess dynamic behavior facility. The large eddy simulation (LES) takes into account both and solid regions, with heat generation 3D conduction resolved pipe walls. study, conducted using OpenFOAM, shows (i) reproducing stable unstable transients DYNASTY, (ii) new observations features flow reversals during transients, (iii) suitability advantages LES for prediction specific natural systems.