[Speno93]

Hi, I am currently simulating a gas interacting with the air. My actual goal is to simulate a volatile chemical evaporating from a surface, but I am treating the liquid portion as a saturated vapour at the surface instead of a liquid to simplify the simulation.

After doing some research I have decided to use reactingFoam as my solver to simulate how the vapour and air interact (without chemistry turned on, naturally)

So since I am a little new to reactingFoam I am asking where in the solver files is diffusion calculated and how can I alter the solver files to make the diffusion coefficient a predefined scalar instead of being calculated from the solver?

Any help would be greatly appreciated.