具有表面张力的流体与运动固体耦合仿真方法

Coupling Simulation Method of Fluid and Moving Solid with Surface Tension

为了提高固液耦合的真实性,提出一种基于物质点法的具有表面张力的流体与运动固体的交互方法.首先使用物质点法仿真框架进行流体仿真,在构建水平集隐式表面并重采样流体表面粒子之后使用连续表面力模型进行流体表面张力的计算;然后通过网格标记定位流体的自由表面与固液接触面,使表面张力计算更加准确;最后使用不同的背景网格分别存储流体和固体的速度场,使用冲量进行碰撞计算,以解决物质点法固液耦合时固有的黏附现象.实验结果表明,所提方法能够更真实地表现流体与运动固体耦合时的细节.

In order to improve the authenticity of the solid-liquid coupling,an interaction method with sur-face tension is proposed for fluid with surface tension and moving solid based on the material point method.Firstly,the material point method is used to simulate the fluid.After constructing the implicit surface of the Level Set and resampling the surface particles of the fluid,the continuum surface force model is used to calculate the surface tension of the fluid.Secondly,the free surface of the fluid and the solid-liquid contact surface are located by grid marking to make surface tension calculation more accurate.Finally,different background meshes are used to store the velocity fields of fluid and solid respectively,and the impulse is used for collision calculation to solve the inherent adhesion phenomenon of solid-liquid coupling in the ma-terial point method.The experiments demonstrate that solid-fluid coupling method with surface tension can effectively show the details of the simulation.