An important area of research for MACH Acoustics, below are a few examples of a FDTD model we have produced to demonstrate various open window conditions.
First a top swung window, notice the noise ingress into the room.
The above but as a bottom swing.
An open window representation.
The above but with a internal baffle.
If you find this content interesting, why not arrange a CPD with MACH Acoustics?