计算物理 ›› 2009, Vol. 26 ›› Issue (4): 553-558.

• 研究论文 • 上一篇    下一篇

重构核粒子法对光滑粒子法的改进效果

殷建伟1, 马智博2   

  1. 1. 中国工程物理研究院北京研究生部, 北京 100088;
    2. 北京应用物理与计算数学研究所, 北京 100088
  • 收稿日期:2008-03-25 修回日期:2008-05-23 出版日期:2009-07-25 发布日期:2009-07-25
  • 作者简介:殷建伟(1983-),江苏泰兴,硕士生,从事计算流体力学方面的研究,北京市2101信箱研究生部100088.

Reproducing Kernel Particle Method in Smoothed Particle Hydrodynamics

YIN Jianwei1, MA Zhibo2   

  1. 1. Graduate School, China Academy of Engineering Physics, Beijing 100088, China;
    2. Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • Received:2008-03-25 Revised:2008-05-23 Online:2009-07-25 Published:2009-07-25

摘要: 光滑粒子法通过核函数进行近似估计,在计算域边界附近,核估计的精度明显下降.重构核粒子法通过校正函数对核函数进行重新构造,提高核估计方法在边界点和内点上对函数的估计精度以及计算的稳定性.研究发现,虽然校正函数的构造立足于对函数的精确估计,但这个优势同样能在对导数的估计中继续保持.通过理论研究及数学、物理模型的模拟,展示重构核粒子法的改进效果,揭示其能够提高精度的原因.

关键词: 重构核粒子法, 光滑粒子法, 无网格方法, 高速碰撞

Abstract: Kernel functions approximate physical quantities in smoothed particle hydrodynamics (SPH) method.However,approximation accuracy decreases near boundaries.By reconstruction of a kernel with correcting function,reproducing kernel particle method (RKPM) improves approximation accuracy and computational stability at internal or boundary points.Though correction is proposed to approximate functions accurately,it also benefits in approximation of derivatives.

Key words: reproducing kernel particle method, smoothed particle hydrodynamics, meshless method, high-velocity impact

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