This paper studies the interaction of two droplets splashing on a stationary film. A source term is included in the large-density-ratio pseudopotential lattice Boltzmann method to achieve tuneable surface tension. This model offers excellent numerical accuracy and stability for droplet impacts on liquid films. The influence of the Reynolds number, Weber number, film thickness, and horizontal/vertical distance between the droplets on the crown geometry evolution is investigated. The energy loss during the impact process and the velocity discontinuity in the liquid film are the two key factors affecting the stability and evolution process of the crown. A smaller Reynolds number or thicker liquid film enhances the energy loss and decreases the velocity discontinuity, leading to more stable side and central jets. An increase in the horizontal distance between the droplets reduces the velocity discontinuity, causing the central jet height to decrease. An increase in the Weber number does not affect the energy loss or velocity discontinuity, but the lower surface tension leads to a dramatic deformation in both the central and side jets. A vertical distance between the two droplets causes an asymmetrical evolution of the crown geometry, and postpones the breakup time of the central jet .

本文研究了两个飞溅在静止薄膜上的液滴的相互作用。大密度比赝势晶格玻尔兹曼方法中包含一个源项，以实现可调谐的表面张力。该模型为液滴对液膜的影响提供了出色的数值精度和稳定性。研究了雷诺数、韦伯数、薄膜厚度和液滴之间的水平/垂直距离对冠部几何演变的影响。冲击过程中的能量损失和液膜中的速度不连续性是影响冠部稳定性和演化过程的两个关键因素。较小的雷诺数或较厚的液膜会增加能量损失并减少速度不连续性，从而导致更稳定的侧射流和中心射流。液滴之间水平距离的增加减少了速度不连续性，导致中心射流高度降低。韦伯数的增加不会影响能量损失或速度不连续性，但较低的表面张力会导致中心和侧射流的剧烈变形。两个液滴之间的垂直距离导致冠部几何形状的不对称演变，并推迟了中心射流的破裂时间。