基于改进的移动粒子半隐式方法的溃坝模拟(英文)

An Improved Moving Particle Semi-implicit Method for Dam Break Simulation

溃坝现象在船舶与海洋工程中是常见而又危险的,甲板上浪、液舱晃荡等都可以看作是广义的溃坝现象。溃坝是一种典型的自由面流动问题,存在运动边界以及复杂大变形和流体强间断问题,因此此类自由面流动的数值模拟一直是计算流体力学领域的一大难题。文章基于改进的移动粒子半隐式方法(MPS),对溃坝问题进行了研究分析。相对于传统的网格法,MP在模拟大变形自由流动中展示了很大的优势。但是,在模拟过程中,由于自由表面粒子的误判以及粒子的过于集中现象,导致压力发生剧烈的震荡现象。针对这些问题,把角度判断法和一个碰撞模型引入传统的MPS进行改进。静水压力的模拟验证了改进后的MPS方法的有效性。在此基础上,文中对无障碍物溃坝和有障碍物溃坝模型进行了模拟和分析。

Dam break is quite a common and hazard phenomenon in shipbuilding and ocean engineering. The objective of this study is to investigate dam break hydrodynamics with improved Moving Particle Semi-implicit method （MPS）. Compared to traditional mesh methods, MPS is feasible to simu- late surface flows with large deformation, however, during the simulation, the pressure oscillates violently, due to misjudgment of surface particles as well as particles gathering together. To modify these problems, a new arc method is applied to judge free surface particles, and a collision model is introduced to avoid particles from gathering together. Hydrostatic pressure is simulated by original and improved MPS. The results verify that improved MPS method is more effective. Based on these, dam break model is investigated with improved MPS.