微液滴动力学特性的耗散粒子动力学模拟

对传统的耗散粒子动力学方法进行了改进.改进的耗散粒子动力学方法采用了包含远程吸引力和近距排斥力的保守力势函数，从而使得用耗散粒子动力学方法模拟多相流动成为可能.应用改进的耗散粒子动力学方法，对微尺度下液滴的形成及液滴在微重力下的大幅度振荡变形进行了数值模拟.计算结果表明，改进的耗散粒子动力学(DPD)方法能够有效地描述微尺度下液滴的动力学特性，对研究复杂流体多相流动有着重要的意义. 关键词： 多相流 微液滴 耗散粒子动力学(DPD)方法 保守力势函数

Simulation of multiphase micro-drop dynamics using dissipative particle dynamics

This paper presents a modified dissipative particle dynamics (DPD) method，which employs an interaction potential with short-range repulsion and long-distance attraction. The modified DPD method is capable of simulating liquids with free surfaces，the behavior of bubbly liquids，drop dynamics and other important multiphase fluid flow processes. The modified DPD method was used to investigate the formation of micro-drops，and the large-amplitude oscillations of an initially oblate liquid drop. The numerical results clearly demonstrate that the modified DPD method involving the interaction potential of short-range repulsion and long-distance attraction is capable of capturing the physics of multiphase micro-drop dynamics，and is of significant importance for investigating complex multiphase systems at micro-meso-scales.