發(fā)布時(shí)間：2018-05-07 17:05

  本文選題：SPH + 應(yīng)力不穩(wěn)定�。� 參考：《科技導(dǎo)報(bào)》2017年02期

【摘要】：針對SPH方法中的壓應(yīng)力不穩(wěn)定問題,提出一種改進(jìn)的Quintic核函數(shù),相對于傳統(tǒng)的"鐘形"核函數(shù)可以更好地改善SPH模擬過程中粒子的聚集現(xiàn)象。應(yīng)用改進(jìn)模型對液滴撞擊超疏水壁面過程進(jìn)行模擬研究,根據(jù)撞擊后液滴鋪展的運(yùn)動特征,分析了影響壁面摩擦阻力的因素以及摩擦阻力的作用區(qū)域。結(jié)果表明,當(dāng)壁面相對浸潤直徑?1時(shí),撞擊后液滴鋪展受壁面黏度系數(shù)υ'的影響不明顯,而當(dāng)?≥1時(shí),相同條件下υ'越大液滴鋪展速度越小,壁面相對浸潤直徑的最大值?_(max)越小,因此?≥1為撞擊后液滴鋪展過程中壁面摩擦阻力的主要作用區(qū)域;壁面黏度系數(shù)υ'值對撞擊后液滴鋪展時(shí)間影響較小,不同υ'條件下液滴鋪展達(dá)到?_(max)的時(shí)間相近,在相同壁面條件下液滴鋪展受到的摩擦阻力會隨著撞擊速度v_0的增加而變大,υ'與v_0大致按二次拋物線變化。
[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，

本文編號：1857742