[Speno93]

Hi there,

I am trying to set up a simulation where I am examining the behaviour of a evaporating volatile chemical. However in simplifying the simulation I am assuming that the chemical exists at the floor boundary as a saturated vapour, rather than going through a liquid phase first.

I had originally planned to use the rhoSimpleFoam solver (with some modifications from previous theory work) as my solver. But having a longer think about it, I started to consider that since I am examining the dispersal of the volatile chemical through air, as well as examing how airflow affects the movement of the chemical, that maybe I would be more suited to modifying a multiphase solver, such as compressibleInterFoam for the gases.

So I guess my question is, is this thinking logical? Is there anything that I am not considering here?

EDIT: Or just after doing a little more research, would twoPhaseEulerFoam be the ideal multiphase solver?

[BlnPhoenix]

I would say twoPhaseEulerFoam is better if not the correct choice here. Two gases have no macroscopical interface they share, so interFoam is not doing it i suppose.

You could also concider reactingTwoPhaseEulerFoam, which can allow you later to include some form of mass transfer, evaporation, chemical reaction etc. if needed.

[Speno93]

yeah that does sound about right, however I am not sure as technically I do not have two phases, as its just a volatile gas dispersing in air. So would a different model,perhaps treating the volatile liquid as a passive scalar.

[BlnPhoenix]

Speno, yes. I think if properties are similar i think it is fair to simulate the dispersion with a passive scalar. In that case you would not need a multiphase solver.