壁面近傍における気泡クラウドの崩壊シミュレーション

抄録

Cavitation erosion is a serious problem in turbomachinery. Quantitative prediction of the cavitation erosion by a numerical simulation is desired. The collapse of a bubble cloud attached to a solid surface causes high pressure and is the most destructive phenomenon. In the present study, a direct numerical simulation of the collapse of a bubble cloud was performed, where the mixture flow model with VOF method is employed, and AMR is used to capture the gas-liquid interface. The result of the collapse of a bubble cloud half attached to a wall showed that the outer bubbles deformed into a concave shape toward the center of the bubble cloud. The outer bubbles gradually collapsed toward the inner bubbles, and the bubble cloud finally collapsed, producing maximum pressure.