摘要
光滑粒子动力学方法(Smoothed Particle Hydrodynamics,简称SPH)方法是一种Lagrange粒子方法,无需网格,抗畸变能力强,能处理大变形、多尺度问题。但是在梯度变化较大的区域精度低、稳定性差;在核近似过程中,由于边界外没有粒子分布,对边界附近的粒子进行求和时,由于粒子不充足会引起边界缺陷问题,而边界缺陷问题会导致在边界上或者在边界附近密度偏小,从而导致压力梯度失真。为了解决边界缺陷问题,需对边界附近的粒子进行修正。应用光滑粒子流体动力学方法(SPH)对二维和三维溃坝波与结构物相互作用过程进行模拟分析,通过对二维和三维溃坝波冲击结构物问题进行数值模拟和分析,合理再现了溃坝波与结构物相互作用的物理过程。
In this paper,an incompressible smoothed particle hydrodynamics （SPH） method is presented to simulate breaking flows with free surfaces.The method employs particles to discretize the Lagrange Navier-Stokes equations.In order to keep the fluid density at the wall particles to be consistent with that of the inner fluid wall boundaries,several lines of dummy particles are placed outside of solid walls,which are spaced according to the initial configuration.Two and three dimensional numerical examples were enforced.The results showed that the SPH method can represent the physical process of breaking Waves Impacting on a Dike.The numerical model is very effective in dealing with large deformation of free surfaces.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2010年第3期332-336,共5页
Chinese Journal of Hydrodynamics
基金
中国博士后科学基金(20070420964)
海岸灾害与防护教育部重点实验室基资助
关键词
自由表面流
溃坝波
SPH
虚粒子
Free surface flow
Breaking Waves
SPH method
Ghost particles
