[vidyadhar]

Hi,


I am trying to write UDF for simulating evaporation of a liquid into its vapor.
This UDF is to be used with VOF method.


1. I want to add source terms in continuity or volume fraction equations of each phase to account for evaporation and condensation of liquid or vapor.
2. I want to add source term in energy equation to account for the heat of evaporation and condensation.


In this regard, which macro out of the following is effective?
A. DEFINE_ADJUST + DEFINE_MASS_TRANSFER
B. DEFINE_SOURCE
C. DEFINE_ON_DEMAND


Thanks in advance!
vidyadhar