The load of cavitation collapse is one of the main input loads to the structure subjected to underwater explosion. The cavitation effects near different boundaries are of particular importance in understanding the load mechanisms and designing the protective structures. In present study, a numerical model that couples a Runge Kutta Discontinuous Galerkin method, a finite element method and an isentropic one-fluid cavitation model is developed to study the cavitation effects induced by underwater explosion near different boundaries. The boundaries of a rigid plate, a steel plate, a rubber coated plate and a foam coated plate are investigated in detail, after validating the coupled numerical model by a case of 1D cavitating flow in an open tube, an experiment of a water-backed plate subjected to water blast and an experiment of underwater explosion near a circular plate. The evolutions of the cavitation region, the pressure profile near the structure and the responses of the structure are comprehensively discussed. The results are beneficial for guiding the design of the protective structures.

空化塌陷的载荷是遭受水下爆炸的结构的主要输入载荷之一。在了解边界机制和设计保护结构方面，不同边界附近的气穴效应特别重要。在本研究中，建立了结合Runge Kutta间断Galerkin方法，有限元方法和等熵单流体空化模型的数值模型，以研究水下爆炸在不同边界附近引起的空化效应。在通过开放管中一维空化流的情况验证耦合数值模型后，详细研究了刚性板，钢板，橡胶涂层板和泡沫涂层板的边界，爆炸后的水后板实验和圆盘附近的水下爆炸实验。全面讨论了空化区域的演变，结构附近的压力分布以及结构的响应。结果对于指导保护结构的设计是有益的。