Re: code0
My understanding is that the flow from the nose is rather smooth. The vortex generators then add energy/turbulence to the airflow/boundary layer, to stop it from detaching at the relatively sharp window edges and forming big eddies that dissipate energy and make lots of noise: the vortex generators introduce small-scale vortices into the flow, and the flow then instead follows the contours of the windows, dissipating less energy and being quieter.