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• 计算机图形学 • 上一篇    下一篇

基于SPH 的雨滴打击不规则边界的模拟方法

  

  1. 1. 北京林业大学信息学院,北京 100083;
    2. 深圳市六联科技有限公司,广东深圳 518109
  • 出版日期:2018-06-30 发布日期:2018-07-10
  • 基金资助:
    中央高校基本科研业务费专项资金项目(2017JC10,2015ZCQ-XX);中国国家留学基金委2017年国家公派高级研究学者、访问学者、博士
    后项目(201706515022);国家自然科学基金项目(61402038,61502109);北京市级大学生科研创新训练基金项目(S201510022069);浙江大
    学CAD&CG国家重点实验室开放课题(A1707);CCF-腾讯犀牛鸟创意基金项目(IAGR20140113)

SPH-Based Simulation of Raindrops Beating an Irregular Boundary

  1. 1. School of Information Science and Technology, Beijing Forestry University, Beijing 100083, China;
    2. Shenzhen Hexaunion Technology Co. Ltd., Shenzhen Guangdong 518109, China
  • Online:2018-06-30 Published:2018-07-10

摘要: 为实现对雨滴打击树枝等不规则边界过程的模拟,研究了流体粒子在网格表示的
固体边界处的受力情况,提出了一种不需要粒子采样的边界受力模拟方法。采用高斯积分法则
对网格模型的三角面片进行积分,并就此对固液边界的粒子的密度进行修正,以积分的方法对
固体边界处的压力、粘性力等参数进行计算,从而保证边界粒子受力的连续性。同时,还提出
了一种吸引力模型,用来控制粒子在沿着物体表面滑落时的运动。实验结果表明,该方法在模
拟水滴铺展、收缩、沿着边界流动等现象时达到了较为真实的效果。

关键词: SPH, 高斯积分法则, 边界条件, 流体

Abstract: In order to simulate the process of raindrops hitting branches and other irregular boundary,
research has been conducted on the force of the fluid particles on solid boundaries represented by the
grid. A kind of boundary force simulation method without particle sampling is proposed. This
approach exploits the Gauss quadrature rules to integrate the triangular patches of a mesh model and
correct the particle density on the solid-liquid boundary. In addition, several parameters, including
pressure and viscous forces on the solid-liquid boundary, are also calculated using an integral
method to ensure the continuity of the boundary force and avoid a splashing phenomenon at the
moment of particles’ beating the boundary. Meanwhile, this paper propounds an attractive force
model to control the movement of the boundary particles flowing down on the surface of an object.
The experimental results reveal that the approaches proposed in this paper can achieve more realistic
effects of phenomenon simulations, such as the raindrop spreading, retracting and flowing along the
boundary, etc.

Key words: smoothed particle hydrodynamics, gauss quadrature rules, boundary conditions, liquids