中文摘要：

自然灾害场景的真实感建模与绘制在防灾救灾、影视特技制作及数字娱乐等方面有着广泛的应用．提出一种新的基于物理的多相流模型来模拟洪水、泥石流、山体滑坡等一系列自然灾害景象．基于各种灾害现象的成因建立不同阶段的流体行进模型，并通过改进传统的平滑粒子流体动力学方法，成功地实现了固液两相之间的相互作用，建立了新的多相流运动模型；通过调节模型中的固相体积比及其他特征参数，可绘制出洪水、泥石流和山体滑坡等不同灾害场景的动态过程，并生动地展示灾害性多相流摧毁建筑物的过程．

英文摘要：

Realistic modeling and rendering of natural catastrophic scenes has been found great applications in the areas such as disaster prevention ＆ rescue, special effects in movie and TV production, digital entertainment, etc. This paper describes a new physically based multi-phase flow model to simulate natural catastrophic phenomena, such as flood, debris flow and landslide We first establish a dynamic model of multi-phase flow with different stages according to the cause of formation of all those natural catastrophic phenomena, and then extend the traditional smoothed particle hydrodynamics （SPH） method to realize the interaction between solid phase and liquid phase. By adjusting the ratio of solid volume fraction and other characteristic parameters, we successfully simulate the dynamic flow of flood, landslide and debris flow with different mixtures and demonstrate the process of multi-phase flow destroying buildings vividly.