Using the lattice Boltzmann method (LBM), the dynamics of a single droplet impacting on desert-beetle inspired, super-hydrophobic, nano-textured bumps was numerically investigated. The focus was placed on the effects of post height, inter-post spacing, bump radius of curvature and impact velocity represented by the Weber number. Three droplet states after the impact were captured, i.e., the suspended Cassie state, the sticky Wenzel state and rebound. The interfaces among these states were then determined in parametric maps generated from the current study. Since the droplets in the Cassie state can be easily removed from the surface and thus favorable for water collection. The conditions satisfied for this state by the geometrical parameters and the Weber number were explored. The results showed that, at moderate impact speeds, droplets impacting on nano-textured bumps with sufficiently high posts or sufficiently small inter-post spacing were generally in the Cassie state and hence favorable for water collection. If these conditions are satisfied, the bump surface curvature only plays a marginal role.

使用晶格玻尔兹曼方法（LBM），数值研究了单个液滴撞击受沙漠甲虫启发的超疏水纳米纹理凹凸的动力学。重点放在由韦伯数表示的立柱高度，立柱间距，凸点曲率半径和冲击速度的影响上。捕捉到撞击后的三个液滴状态，即悬浮的卡西状态，粘的温泽尔状态和回弹。然后在当前研究生成的参数图中确定这些状态之间的接口。由于处于卡西状态的液滴可以容易地从表面去除，因此有利于集水。探索了通过几何参数和韦伯数满足该状态的条件。结果表明，在中等撞击速度下，撞击具有足够高的柱或足够小的柱间间距的纳米纹理凸起的液滴通常处于卡西状态，因此有利于集水。如果满足这些条件，则凸块表面曲率仅起到边际作用。