Thermo-induced convection in a agricultural building (slow motion)

The numerical simulation is done by . The Mesh has ca. 550000 grid points. Rayleigh number Ra~1e12, External temperature T_out=274K, Bottom temperature T_bottom=. The building is closed. The walls have constant heat flux. Shown is the time intervall t=0s-100s. The whole simulation has t=1000s. Solved are the incompressible Navier-Stokes Equations with a one-equation LES-model. The solver buoyantPimpleFoam was used. The whole simulation is shown here: