[shaunbull]

Hi, I have little to no experience with UDF's and have a problem that requires the use of one.

"The penetration of 2D meteor into a dense atmosphere is accompanied by its progressive destruction because of the hypersonic velocity of the meteorite and, hence, the vast pressure behind the bow shock. The aerodynamic loads leads to a sharply accelerated disintegration of the meteorite into smaller and smaller debris which retain approximately the same total volume. Because the radius of each piece sharply reduces, the heat transfer suddenly increases. Thus, this process is accompanied by a rapid ablation mechanism. As a result, the whole body is converted into vapor and the kinetic energy of the meteorite is released into the atmosphere."

I will be creating a model at the point of explosion, so the volume will be the same as the instant before it evaporated. I believe I require a UDF to define the initial conditions for density and internal energy.

Any help or guidance would be greatly appreciated. Cheers