Contact angle effect on the drop impact onto a solid substrate

As drop impacts onto a solid substrate, abundant outcomes such as splashing, bouncing can be observed under different conditions including gas, liquid and solid properties. We study the contact angle effect on the splashing of drop impact by direct numerical simulation with open source codes Gerris and Basilisk. For a typical partial wetting substrate with a contact angle of $90^\circ$, we obtain a phase diagram of splashing or not by varying the density and viscosity ratio between gas and liquid. Splashing can be either created by changing the contact angle to smaller than $90^\circ$, or eliminated with a contact angle larger than $90^\circ$ with all the other properties constant. The wettability plays a role in the formation of splashing during drop impact on solid.