Study on the physics during the final stageof bubble collapse

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An improved ghost fluid method has been developed for understanding nonspherical bubble collapse with nonequilibrium phase transition.We have succeeded in capturing the fine interfacial structure by using adaptive zonal grids in which the grid resolution is changed according to the volume change and translational motion of a bubble. The pressure and temperature discontinuity at the bubble interface has been captured sharply with ghost fluids. The method has been applied to the bubble collapse by shock-bubble interactions and to the collapse of a bubble cloud in a channel, and so on. The bubble collapse and the propagation of pressure waves in gas-liquid two-phase Venturi flows have also been investigated, experimentally. The influence of nonequilibrium phase transition on bubble collapse and the characteristic of pressure waves with bubble oscillations in bubble mixtures have been clarified.