Effects of turbulence near a free surface on the dynamics of two-phase flow

Uzawa, Ken; Watanabe, Tadashi

When a spent fuel pool suffered from a huge seismic acceleration, a sloshing may occur and causes overflow of water and damage of structure. To prevent these phenomena from occurring, effects of turbulence on a sloshing height and fluid pressure on the structure should be taken into account, however they are not fully quantitatively evaluated. Therefore, we have performed numerical simulations of a dam break problem as an elementary process of the sloshing based on the Launder-Gibson (LG) model, which is one of Reynolds-averaged Navier-Stokes equations. Until now, we found that a fluid pressure based on the LG model is in good agreement with experimental fluid pressure. In this research, we have confirmed same results by performing Large Eddy Simulation (LES). We found that the overflow of water is an order of magnitude more accurate than previous work.