So far, so good.
For second screen shot, I suggest you use it systematically to spot wind directions in a plane.
- Use ‘Cutting plane’ and move it to appropriate geometry height.
- Use ‘Vectors’ and set it for ‘Velocity’.
- Adjust arrow (vector) size tweaking it in ‘Results’.
Learning correct visualization takes time. And it is by doing, so few days are necessary to be at ease, alas.
Regarding mesh you make, for starting I say that back, curved face of the building is too fine (2 cm cell?). I suggest you use ‘Advanced setting’ while meshing and set ‘Small feature suppression’ to bigger value than 1e-5 m. This could help with building edges.
Bottom line is to make your mesh smaller while evaluating. You should be able to simulate in few minutes only.
Later on, you can check how finer mesh relates to your first and quick mesh settings: it is possible, that your are simply wasting your core-hours now, and these resources are limited.
Cheers,
Restam