Numerical simulations have unexplored potential in the study of droplet impact on non-uniform wettability surfaces. In this work, we compare numerical and experimental results to investigate the application potential of a Volume of Fluid method utilized in . The approach implements the Kistler model for the dynamic contact angle of impacting droplets. We begin with an investigation on the influence of the most important solver parameters in order to optimize the computational setup and reach the best compromise between computational cost and solution errors, as assessed in comparison to experimental results. Next, we verify the accuracy of the results for droplet impact on uniform hydrophilic and superhydrophobic surfaces. Benchmarking the maximal spreading factor, contact and spreading times, as well as contact-line behavior, we show strong agreement between the present numerical results and the models of Pasandideh-Fard et al. (1996) and Clan'et et al. (2004). Lastly, we demonstrate the capability of the model to accurately produce outcome behaviors of droplets striking distributed-wettability surfaces, which introduce 3-D characteristics, even in orthogonal impact. The model successfully predicts droplet splitting and vectoring, as reported in the experiments of Schutzius et al. (2014). In addition, we demonstrate a configuration wherein a spreading droplet becomes arrested within a disc of higher wettability than its surrounding domain. The main contribution of the present work is a numerical model capable of accurately simulating droplet impact on spatially non-uniform wettability patterns of any foreseeable design.

中文翻译：

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液滴对润湿性图案表面影响的数值模拟

在液滴对非均匀润湿性表面的影响研究中，数值模拟具有未开发的潜力。在这项工作中，我们将数值和实验结果进行比较，以研究在中使用的“流体体积”方法的应用潜力。该方法为撞击液滴的动态接触角实现了奇石乐模型。我们首先调查最重要的求解器参数的影响，以优化计算设置，并在计算成本和解决方案误差之间取得最佳折衷，与实验结果相比进行了评估。接下来，我们验证液滴对均匀亲水和超疏水表面的影响的结果的准确性。对最大扩展因子，接触和扩展时间以及接触线行为进行基准测试，我们显示了目前的数值结果与Pasandideh-Fard等人的模型之间的强烈一致性。（1996）和Clan'et等。（2004）。最后，我们证明了该模型能够准确产生撞击分布式可湿性表面的液滴的结果行为，即使在正交冲击下，该行为也会引入3-D特性。如Schutzius等人的实验所报道，该模型成功预测了液滴的分裂和矢量化。（2014）。另外，我们证明了一种构型，其中散布的液滴被阻止在比其周围区域更高的润湿性的圆盘内。本工作的主要贡献是能够精确模拟液滴对任何可预见设计的空间非均匀润湿性模式的影响的数值模型。