The numerical meshless method, Moving-Particle Semi-implicit Method (MPS), coupled with a sub-particle scale (SPS) turbulence model, are presented to simulate collapse of a water column and liquid sloshing on roll motion. A new free surface traced method is putted forward for MPS, the new free surface traced method is detected by neighbors, taking into account the number density parameter has a higher efficiency for free surface, the neighbor detected method is mixed with number density parameter. The result shows that the neighbor detected method is efficiency for free surface, and a area-time average method is used for pressure fluctuation in MPS and obtains a quit good result.%研究了移动粒子半隐式法(MPS),结合Smagorinsky涡粘模型,实现了MPS的大涡模拟.针对MPS中原自由表面判别方法容易造成非自由表面粒子被误判这一缺陷,提出了一种新的基于邻居搜索的混合判别方法,该方法在原方法容易出错的阶段使用邻居搜索,搜索范围和MPS模型中梯度模型一致以减少计算量,使用表明该方法能够较准确地识别自由表面并显著地减少原自由表面判别法导致的误判现象.在压力震荡现象方面,使用了一种时间-面积混合平均法.最后模拟了溃坝模型和半满液箱模型,模拟的结果同实验值基本保持一致.
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