CFD - Modelling of a propane leak

Proof-of-concept case modelling dispersion of a propane gas leak
Modelling of the gas is only accurate within the enclosure where the mesh is fine. Outside of the enclosure numerical dispersion from the coarse mesh disperses the propane too quickly.

[@taehwankim7841]

Hi.
I also need to do a gas leakage simulation.
Can I know which software you used for this?
Thanks.