多液滴撞击自由液面复杂流动的δ-SPH模拟  

Simulation of complex flow of multi-droplet impingement on a free surface by δ-SPH method

作　　者：郑春耀 周媛 张林 ZHENG Chun-yao;ZHOU Yuan;ZHANG Lin(State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190;School of Chemical Engineering,University of Chinese Academy of Sciences,Beijing 100049;Process Simulation&Calculation Center,Petrochemical Research Institute,Beijing 102206)

机构地区：[1]中国科学院过程工程研究所介科学与工程全国重点实验室,北京100190 [2]中国科学院大学化学工程学院,北京100049 [3]石油化工研究院过程模拟计算中心,北京102206

出　　处：《计算力学学报》2024年第6期1081-1086,1129,共7页Chinese Journal of Computational Mechanics

基　　金：多相复杂系统国家重点实验室自主部署课题(MESO-24-A04,MESO-23-A01)资助项目

摘　　要：基于δ-SPH法对多液滴撞击自由液面进行了模拟与分析。首先,通过添加密度耗散项和人工粘性项,消除压力场的虚假振荡,保证数值格式的稳定性;然后,对单液滴撞击自由液面进行模拟,通过与文献结果比较验证方法的可靠性;最后,对双液滴垂直/水平分布、四液滴菱形分布撞击自由液面进行模拟,分析液滴垂直/水平距离等对撞击结构的影响。结果表明,δ-SPH法能准确捕捉多液滴撞击自由液面时出现的液体飞溅、液体大幅晃动和不连续液面等强非线性现象,还能获得光滑的压力分布。Based on the δ-SPH method,the multi-droplet impingement on a free surface is simulated and analyzed.First,by adding a density dissipation term and am artificial viscous term in the governing equations,the spurious numerical oscillations in pressure can be removed and the stability of the numerical scheme is ensured.Then,the impact of a single droplet on a free surface is simulated,and the reliability of the δ-SPH method is verified by comparison with the results reported in the literature.Finally,two droplets with a vertical/horizontal distribution,four droplet’s with a rhombus distribution,which impinge on a free surface,are simulated,and the effects of the droplet vertical/horizontal travel.on the impact structure are analyzed.The numerical results show that:the δ-SPH method can exactly capture the strong-nonlinearity phenomena such as splashing,liquid large-amplitude sloshing and discontinuous free surface when multi-droplets impinge on a free surface,and a smooth pressure field is also obtained.

关 键 词：无网格法 δ-SPH 液滴撞击 自由液面 复杂流动 

分 类 号：O242[理学—计算数学]