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I have been trying to replicate previous work on gas (H2S) dispersion in flat terrain where the H2S source is a surface on the ground; its dimensions are 20m x 10m. The CFD domain size is 40m x 30m x 3m. The density and viscosity of H2S and air were defined linearly piecewise, just similarly to this tutorial: https://2021.help.altair.com/2021/hwsolvers/acusolve/topics/tutorials/acu/acu_4300_intro_cfd_r.htm. The obtained results always have a huge error compared to the paper: https://www.mdpi.com/20734433/13/11/1822#:~:text=Hydrogen sulfide (H2S,a health challenge for workers. I have tried different meshing and setup settings. I tried simulating a jet release case of CO2 and the obtained results are satisfactory compared to a research paper. The issue is that the buoyancy impact was not taken into account. I Hope I can get support to activate the buoyancy with building UDF or by any way possible.
Could you post your .inp and .Log files? Also have you tried enabling the gravity force, as that would take into account differences due to fluid density.
