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粒子法中压力振荡的机理研究

朱跃 姜胜耀 杨星团 段日强

朱跃, 姜胜耀, 杨星团, 段日强. 粒子法中压力振荡的机理研究[J]. 力学学报, 2018, 50(3): 688-698. doi: 10.6052/0459-1879-17-294
引用本文: 朱跃, 姜胜耀, 杨星团, 段日强. 粒子法中压力振荡的机理研究[J]. 力学学报, 2018, 50(3): 688-698. doi: 10.6052/0459-1879-17-294
Zhu Yue, Jiang Shengyao, Yang Xingtuan, Duan Riqiang. MECHANISM ANALYSIS OF PRESSURE OSCILLATION IN PARTICLE METHOD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(3): 688-698. doi: 10.6052/0459-1879-17-294
Citation: Zhu Yue, Jiang Shengyao, Yang Xingtuan, Duan Riqiang. MECHANISM ANALYSIS OF PRESSURE OSCILLATION IN PARTICLE METHOD[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(3): 688-698. doi: 10.6052/0459-1879-17-294

粒子法中压力振荡的机理研究

doi: 10.6052/0459-1879-17-294
基金项目: 国家自然科学基金资助项目(11472155).
详细信息
    作者简介:

    通讯作者: 朱跃, 博士研究生, 主要研究方向: 反应堆热工水力, 粒子法.E-mail: flyzhuyue@163.com; 段日强, 副研究员, 主要研究方向: 反应堆热工水力, 粒子法. E-mail: duanrq@tsinghua.edu.cn

    通讯作者:

    朱跃,

    朱跃,段日强

MECHANISM ANALYSIS OF PRESSURE OSCILLATION IN PARTICLE METHOD

  • 摘要: 移动粒子半隐式法(moving particle semi-implicit method, MPS)是一种适用于不可压缩流体的无网格方法, MPS方法常应用于自由表面大变形问题.MPS 方法提出至今一直存在着严重的压力振荡问题. 本研究针对MPS 方法中存在的压力振荡现象, 首先将实际的物理问题简化为一维模型, 并从粒子之间相互位置关系的角度说明了MPS 方法中压力波动产生的原因.在采用MPS方法进行模拟时, 加入了粒子碰撞模型, 通过对碰撞系数的选择从而控制粒子之间的相互位置关系.并且对经典的溃坝问题进行了模拟, 结果表明随着碰撞系数的增加, 粒子数密度偏差的波动幅度都会减小, 从而压力振荡的幅度得到了有效的抑制.并且对比了两种不同核函数对压力振荡的影响, 结果表明: 采用高斯核函数时, 压力振荡的幅度更小, 这是因为采用高斯核函数时, 相同的粒子位置波动幅度将会得到较小的粒子数密度偏差的波动.由于在模拟过程中粒子运动的随机性, 这将导致粒子数密度偏差产生随机的波动, 从而产生压力振荡, 因此粒子法中的压力振荡很难彻底消除.

     

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出版历程
  • 收稿日期:  2017-08-29
  • 刊出日期:  2018-05-18

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