[gmori]

Hello.


I am trying to analyze the case of solar radiation entering the building using chtMultiRegionSimpleFoam.
The analysis area is a solid area that is assumed to be the ground, and an air box that is assumed to be the building.
Solar radiation characteristics are given to each wall and ceiling surface, and solar conditions are given for a given date and time.



The analysis case is attached.

However, the residuals of this analysis show that from a certain step the residuals level off and oscillate periodically.

I think that there is an anomaly in the boundary condition, but I have not solved it.

Can anyone give me some advice on this problem?