Sorry I didn't quite understand your first two posts. I am doing a 2D simulation of a droplet with a diameter of 2mm hitting a wall in fluent (red is water phase. blue is air phase). What I want to ask is, after the calculation is over, in CFD-post, how can we output the variation law of the spreading width of the water phase on the wall with time? I don't have any ideas at the moment, I know how to set the isosurface, and then I don't know how to do it.