基于SPH应力修正算法的液滴撞击超疏水壁面模拟分析

发布时间：2018-05-07 17:05

  本文选题：SPH + 应力不稳定　； 参考：《科技导报》2017年02期

【摘要】：针对SPH方法中的压应力不稳定问题,提出一种改进的Quintic核函数,相对于传统的"钟形"核函数可以更好地改善SPH模拟过程中粒子的聚集现象。应用改进模型对液滴撞击超疏水壁面过程进行模拟研究,根据撞击后液滴铺展的运动特征,分析了影响壁面摩擦阻力的因素以及摩擦阻力的作用区域。结果表明,当壁面相对浸润直径?1时,撞击后液滴铺展受壁面黏度系数υ'的影响不明显,而当?≥1时,相同条件下υ'越大液滴铺展速度越小,壁面相对浸润直径的最大值?_(max)越小,因此?≥1为撞击后液滴铺展过程中壁面摩擦阻力的主要作用区域;壁面黏度系数υ'值对撞击后液滴铺展时间影响较小,不同υ'条件下液滴铺展达到?_(max)的时间相近,在相同壁面条件下液滴铺展受到的摩擦阻力会随着撞击速度v_0的增加而变大,υ'与v_0大致按二次抛物线变化。
[Abstract]:In this paper, an improved Quintic kernel function is proposed to solve the problem of compressive stress instability in SPH method. Compared with the traditional "bell-shaped" kernel function, the aggregation of particles in the SPH simulation process can be improved better than that of the traditional "bell-shaped" kernel function. An improved model is applied to simulate the superhydrophobic wall process of droplet impact. According to the motion characteristics of droplet spreading after impact, the factors affecting the friction resistance of the wall and the action region of the friction resistance are analyzed. The results show that when the wall surface is relative to the wetting diameter? 1, the droplet spreading is not affected by the wall viscosity coefficient, but when? 鈮，

本文编号：1857742