in the FDS (Fire Dynamics Simulator) simulation, the WARNING message "WARNING: Minimum density, 0.016 kg/m³, clipped in Mesh 1" is encountered.

[gdut21122]

[Er9y714]

See #12676

[mcgratta]

If this is a new issue that you want someone to look at, provide details and a simplified input file on the Issue Tracker. I do not understand what the question is here.