In the present study, the contact angle model and the origin of the parasitic current, specifically the parasitic currents relation with grid distribution have been studied to provide accurate prediction of droplet impact on static and moving walls in Volume of Fluid (VOF) framework. It has been quantitatively shown that the number of neighboring cells sharing the same faces influences the gradient calculations associated with the formation of parasitic current. It has been observed that the polyhedral cell structure delivers smoother the interface gradient distribution than the cartesian cell structure. After implementing, modified Kistler contact angle model in OpenFoam and using ployhedral cells for the simulations, we could succesfully validate transient droplet shapes formed upon impact with those obtained from experiments. Droplet outcomes, such as deposition, partial rebound and split deposition on stationary and moving smooth surfaces are obtained consistent with experimental results.

中文翻译：

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液滴撞击静态和移动墙壁的 3-D 模拟

在本研究中，已经研究了接触角模型和寄生电流的起源，特别是寄生电流与网格分布的关系，以准确预测液滴对流体体积 (VOF) 框架中静态和移动壁的影响。已经定量地表明，共享相同面的相邻单元的数量会影响与寄生电流形成相关的梯度计算。已经观察到多面体单元结构比笛卡尔单元结构提供更平滑的界面梯度分布。在 OpenFoam 中实施修改后的 Kistler 接触角模型并使用多面体单元进行模拟后，我们可以成功地验证在撞击时形成的瞬态液滴形状与从实验中获得的形状。液滴结果，