Instability at pRefPoint
 

Hi,

I am doing a simulation of the atmospheric boundary layer using a solver based on buoyantPimpleFoam.

It rans fine when the case has a simple mesh (i.e. flat terrain). For more complicated meshes (i.e. complex terrain) I get "instabilities" at the location of the pRefPoint, no matter where I set up this point. See the picture.

Does anybody know why?

Thanks,

Mary