Ansys Employee

If this is only due to concentration gradients then you can switch it off but you will then not account for any energy content change due to vaporization..

Why DDPM? 

MultiVOF is a submodel allowing for better interlolation schemes. So you can use it, bear in mind that the interface mass transport would rather require something diffusive use ndo not use at first GEo. (Compressive from Sharp/Dispersed is fai enough.)