Thermo-induced convection in a agricultural building (vorticity log)

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 vorticity magnitude in the time intervall t=0s-1000s. The vorticity is color coded in log scale. 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 start in slow motion is shown here: