Define Atmospheric Inlets
Use the Atmospheric tool to define atmospheric boundary layers at an inlet.
When the inflow type is set to atmospheric, the inlet velocity profile and turbulence inflow quantities are generated automatically. Inlet velocity is prescribed via log law while inlet turbulence properties are computed according to the chosen turbulence model. Necessary inputs are surface roughness and reference velocity.
Corresponding velocity and turbulence boundary conditions at the inflow will be generated automatically. Note that there should be an empirical ratio (30) between inflow roughness and standard wall roughness. For example, if atmospheric boundary layer inflow has a roughness of 0.001m on the ground, the standard turbulence wall function should have a roughness of 0.03m.