Development of physical component boundary fitted coordinate (PCBFC) method for the analysis of free surface flow

A novel numerical method was developed for the analysis of free surface flow by incorporating physical component (PC) as variables into the boundary fitted coordinate (BFC) method defined using Riemannian geometry. This incorporation was carried out by introducing the intrinsic analysis space and developing the intrinsic geometry of PC. Exactness, numerical stability, and quickness of computation of the PCBFC method were validated by the analysis of in-vessel free surface flow under forced circulation, which characterizes the flow of coolant in the reactor vessel of FBR. Experimentally observed 'flow-induced sloshing of in-vessel circulated free surface flow' was reproduced numerically and explanation was given to the mechanism and condition for the occurrence by numerically singling out the nonlinear wave that enhances the sloshing. (orig.)