The following video shows a room that is heated from the windows and cooled down with an air conditioner (in the center of the room). The air conditioner was modeled using the fvOptions while applying an energy sink of 5000 J/m³. The sink is set as a semi-implicit source while the energy reduction was set as an explicit part (the value will not go to the matrix, it will be pushed to the source vector).


The room is totally closed while the windows are set to have an external energy increase of 100 W. Surely, this is wrong but the case is just for demonstration. During the simulation, one can see the falling (cold) air in the center and the hot rising air from the windows.


Most people have problems in such cases as the fluid flow is totally unforced. That means, that only the buoyancy term is dominating the fluid flow. Using steady-state solver needs to set-up extreme small relaxation factors which will lead to a possible solution but this might also influence the results.


Thanks to Thomas Tian for allowing Holzmann CFD to show the results here.


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Enjoy and keep Foaming,
Tobias

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