铜液滴飞溅的流体体积模拟及其对建模方法的敏感性

L. Florio
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引用次数: 0

摘要

液滴与固体表面的相互作用是广泛现象的基础,从新的制造工艺,表面上的冰积聚,到当液滴随流体沿流道流动时的烧蚀和污垢积聚。基于计算流体动力学的模拟提供了一个可控的环境,在这个环境中,当液滴撞击表面时,可以探索液滴运动、变形或破裂、凝固和熔化的细节。可以改变操作、材料或几何条件,并且可以使用液滴相关现象中产生的变化来获得控制液滴相关过程所需的信息,以达到预期目的。目前的工作研究了预测的飞溅发展的敏感性,作为一个单一的铜液滴冲击在冷铜基底上的变化,在基于流体体积的计算建模方法。一个液态铜液滴被指定了初始速度和温度,并被设置为撞击冷的固体铜表面。随着时间的推移,飞溅剖面与文献中的结果进行了比较。研究的计算建模方法变化包括表面张力处理、体积分数方程的求解方法、体积分数时间分步计算方法、体积分数截止值和科朗数、体积分数更新频率、体积分数离散化方法、泥区参数和网格细化。研究结果可用于提供信息,以帮助生成能够更准确地询问液滴表面相互作用的模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Volume of Fluid Simulations of Copper Droplet Splat and Sensitivity to Modeling Methods
Liquid droplet interactions with solid surfaces are fundamental to a wide range of phenomena from novel manufacturing processes, ice accretion on surfaces, to ablation and fouling build-up when droplets are carried with fluid flow along a flow path. Computational fluid-dynamics based simulations offer a controlled environment in which to explore the details of the droplet motion, deformation, or break-up and solidification and melting as droplet impingement on a surface occurs. The operating, material, or geometric conditions can be altered and the resulting changes in the droplet related phenomena can be used to gain the information needed to control the droplet related processes for an intended purpose. The present work investigates the sensitivity of the predicted splat development as a single copper droplet impact upon a cool copper substrate to variations in a volume of fluid based computational modeling method. One liquid copper droplet is assigned an initial velocity and temperature and is set to impact a cold solid copper surface. The splat profile, as time progresses, is compared to the results in the literature. Among the computational modeling method changes investigated are the surface tension treatment, the solution method for the volume fraction equation, the volume fraction time sub-step calculation method, the volume fraction cut-off value and Courant number, the frequency of the volume fraction updates, the volume fraction discretization method, the mushy zone parameter, and mesh refinement. The study results can be used to provide information to aid in the generation of the models that can more accurately interrogate droplet-surface interactions.
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