计算物理 ›› 2009, Vol. 26 ›› Issue (4): 548-552.

• 研究论文 • 上一篇    下一篇

高速碰撞SPH方法模拟中的初始光滑长度和粒子间距

徐金中, 汤文辉   

  1. 国防科学技术大学理学院技术物理研究所, 湖南 长沙 410073
  • 收稿日期:2007-11-19 修回日期:2008-09-11 出版日期:2009-07-25 发布日期:2009-07-25
  • 作者简介:徐金中(1977-),男,山西原平,博士生,从事超高速碰撞动力学方面的研究.
  • 基金资助:
    国家自然科学基金(10672180,10802097)资助项目

Initial Smoothing Length and Space Between Particles in SPH Method for Numerical Simulation of High-speed Impacts

XU Jinzhong, TANG Wenhui   

  1. Institute of Technical Physics, College of Science, National University of Defense Technology, Changsha 410073, China
  • Received:2007-11-19 Revised:2008-09-11 Online:2009-07-25 Published:2009-07-25

摘要: 采用光滑粒子流体动力学方法对高速碰撞问题作数值模拟,分析初始光滑长度和非一致粒子间距对计算结果的影响,提出修正光滑长度法,并引入XSPH速度纠错公式.数值结果表明,初始光滑长度越大,弹丸的刚性越小,h0的合理取值范围应为d0<h0≤1.5d0;粒子间距越小,材料的刚性越小.非一致粒子间距和均匀粒子分布的计算结果吻合的较好.

关键词: 高速碰撞, 光滑粒子流体动力学, 粒子间距, 数值模拟

Abstract: High-speed impact problems are simulated with smoothed particle hydrodynamics method.Initial smoothing length and nonconforming space between particles in simulation are analyzed.A modified smoothing length approach is put forward.With increase of initial smoothing length, projectile rigidity decreases gradually.A rational range of initial smoothing length is d0< h0≤ 1.5d0.With decrease of space between particles,rigidity of material decreases.With XSPH correction on velocity of a particle,results by nonconforming space between particles agree well with those from identical particle distribution.

Key words: high-speed impacts, smoothed particle hydrodynamics, space between particles, numerical simulation

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