A numerical simulation of underwater shock-cavitation- structure interaction

Abstract

Accurate treatment of material interfaces and accurate modeling of unsteady cavitation are critical for simulating shock-cavitation-structure interaction. Various GFM-based algorithms for tracking material interfaces are analyzed and compared, and then a new GFM-based algorithm (the present GFM) is developed which is shown to be cost-effective and sufficiently accurate for the gas/liquid-solid simulations. A few commonly employed one-fluid cavitation models are also analyzed and compared. The range of applicability for each model is determined. The Isentropic model, as well as the modified Schmidt model is proposed to achieve more consistency and wider applications. The proposed present GFM and cavitation models are extensively applied to model 1D & 2D unsteady cavitating flows like water hammer problem and underwater explosions. The present GFM is shown to be fast and robust for treating the material interface of multi-dimensions and the Isentropic model or the modified Schmidt model is able to simulate the dynamics of multidimensional cavitation well.