【摘要】 针对移动粒子半隐式(MPS)方法在液体自由表面张力建模时粒子数量过大的问题，提出了一种粒子与网格耦合的自由表面张力建模方法，该方法仅对液相进行粒子离散，并对自由表面附近区域设置背景网格，根据网格与自由表面粒子的距离勾画出level-set函数的等高线，进行自由表面的曲率计算。对比了面积插值法和距离插值法对曲率由网格插值到粒子的准确性，结果表明距离插值法具有较高的计算精度。最后，通过静水池压力、液滴振荡和液滴融合3个基准算例验证了粒子与网格耦合的表面张力模型的准确性和稳定性。更多还原

【Abstract】 To address the issue of excessive particle numbers in liquid free surface tension modeling using the moving particle semi-implicit(MPS) method, a particle-grid coupled approach for free surface tension modeling was proposed. This method only discretizes the particles in the liquid phase and sets the background grid in the vicinity of the free surface. According to the distance between the grid and the free surface particles, the contour line of the level-set function is drawn to calculate the curvature of the free surface. The accuracy of curvature interpolation from grid to particle by area-weighted scheme and distance-weighted scheme is compared. The results show that the distance-weighted interpolation approach has higher calculation accuracy. Finally, the accuracy and stability of the surface tension model coupling particle-grid are verified by three benchmark examples of static pool pressure, droplet oscillation and droplet fusion.更多还原