The droplet impact on groove-patterned surfaces is numerically studied. Two types of groove-patterned surfaces, one is modelled with uniform grooves and ridges, another is modelled with different grooves and ridges on the two halves of the substrates. The simulation results show that for the droplet impact on substrates with uniform length ratio (ratio of ridge width to droplet radius), low impact velocity cannot cause obvious anisotropic spreading and receding, while high velocity can, and the maximum spreading diameters at both directions parallel and perpendicular to the grooves witness a decrease with the increase of the length ratio. For droplet impact on substrates with different length ratio, the unsymmetrical spreading and receding of the droplet in the direction perpendicular to the grooves can also be observed. The understandings obtained in this study could provide ideas for relevant applications, such as building materials with self-cleaning and anti-icing properties in civil engineering.

数值研究了液滴对沟槽图案表面的影响。两种类型的沟槽图案化表面，一种是用均匀的沟槽和凸脊建模，另一种是用两半基板上的不同沟槽和凸脊建模。仿真结果表明，对于液滴以均匀的长度比（脊宽与液滴半径之比）冲击，低冲击速度不会引起明显的各向异性扩展和后退，而高速冲击会导致各向异性，并且最大传播直径平行垂直于沟槽的长度随长度比的增加而减小。对于液滴对具有不同长度比的基板的冲击，还可以观察到液滴在垂直于凹槽的方向上的不对称扩散和后退。