SPH中的内外单元粒子搜索技术  

Inner and outer particles searching method in SPH method

作　　者：张晨明[1] 刘瑛琦 李同飞[1] 郑金海[1] 

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,江苏南京210098 [2]长江航运规划设计院,湖北武汉430030

出　　处：《水动力学研究与进展（A辑）》2008年第3期275-280,共6页Chinese Journal of Hydrodynamics

基　　金：教育部新世纪优秀人才支持计划(NCET-07-0255)

摘　　要：本文应用SPH数值逼近方法离散NS方程,建立了二维水动力数值模型。自由表面施加Dirichlet条件,固边界采用固定壁粒子,镜像粒子施加完全滑移条件,压力采用状态方程计算。提出了内外单元粒子搜索技术,计算效率较传统的DSM和Mihai方法有显著提高,对粒子数量超大的情况也有良好的表现。采用溃坝算例验证模型的可靠性。A two-dimensional hydrodynamic model is developed,on the basis of numerical approximation formulations of Smoothed Particle Hydrodynamics （SPH） in discretizing NS equation. In the model,Dirichlet conditions are applied to free surfaces,solid boundaries are modeled with fixed wall particles,no-slip boundary conditions are employed to mirror particles,and pressure can be defined through solving state equation. A new Nearest Neighboring Particles Searching （NNPS） technique is developed,which can improve the computation efficiency remarkably compared with the traditional DSM method and the Mihai’s method. The case of the dam breaking is used to verify the present model.

关 键 词：SPH方法 内外单元粒子搜索技术 NS方程 

分 类 号：O175.2[理学—数学]