上海交通大学学报

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (10): 1450-1454.

• 物理学 • 上一篇    下一篇

一种适用于移动半隐式法的缓解压力振荡方法

孙学尧a，张怀新a,b，潘徐杰a   

  1. （上海交通大学 a. 船舶海洋与建筑工程学院； b. 海洋工程国家重点实验室， 上海 200240）
  • 收稿日期:2010-07-20 出版日期:2011-10-31 发布日期:2011-10-31
  • 基金资助:

    国家自然科学基金资助项目（50979059）

A Technique of Reduction Pressure Fluctuation for Moving-Particle Semi-implicit Method

 SUN  Xue-Yao-a, ZHANG  Huai-Xin-a, b , PAN  Xu-Jie-a   

  1. （a. School of Naval Architecture, Ocean and Civil Engineering;b. State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China）
  • Received:2010-07-20 Online:2011-10-31 Published:2011-10-31

摘要： 针对无网格移动粒子半隐式（MPS）法压力振荡性过大，且难以处理压力的问题，提出一种新的压力缓解方法.该方法在MPS法压力计算方程中加入用以保证流体不可压缩的速度散度为零的条件，在MPS法计算完成后对压力进行适当的时间平均，得出最终计算压力，在一定程度上缓解压力的振荡.通过溃坝和船体横摇晃荡2个实例，将新方法和MPS法进行比较，验证新方法在不增加计算量的基础上对缓解压力振荡有很好的效果.

关键词: 无网格法, 移动粒子半隐式法, 压力缓解

Abstract:  A common defect of movingparticle semi-implicit method and other mesh free method such as SPH is that the pressure fluctuation is obvious and hard to resolve. A new method was proposed to reduce pressure fluctuation and has good effect. Divergence-free condition representing fluid incompressible is used to calculate pressure smoothly, then time average is used to deal with the calculation. There are two kinds of cases being numerically simulated which are water collapse and ship roll sloshing. Comparing to the original MPS method, the result from the new method is real, so that the new method has good practicability and reliability.

Key words: mesh free method, moving-particle semi-implicit(MPS)method, pressure smooth

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