Thanks for your help.
I have since tried this, but for some reasons the results weren’t as expected. I have a test model that I compare results to, that I had ran using the Hex-dom mesher. Whilst I dont expect the results to be exactly the same, I expect the direction to be similar. For some reason, the wind velocity was not running through the flow volume in the same manner as the image I had previously uploaded here. This meant there was something wrong with the enclosure or settings. I had exhausted all options in trying to fix this and still did not come to a conclusion regarding what the issue was. I had assigned the enclosure walls, the same boundaries that I had applied to the Geometry Primitive Box used in Hex meshing, and the wind instead of flowing as shown above, seemed to immediately twist and turn, making for a useless simulation.
I’m now just trying to push on with the Hex meshing on my complex model with square holes, in the hope it will ultimately work. I added the symmetry feature to speed up the meshing, which seems to have worked, but I’m not sure if it will be interpreted correctly when it comes to the simulation, which I am about to try.
In case you waned to have a look, the Sim I was referring to that showed wind flow unlike I was expecting is named “Plain Standard”, and the one I said I am pushing on with is called “S1 10% Split” both in the following project: