What would be the optimal proportion for the size of domain for get the best results? I have a building which is around 30m x 30m and it seems domain size make a big difference on end results.
You'll want your domain to be large enough to capture the wake and the pressure effects on all ends. A good starting points is 5 diameters upstream and to the sides, and 10 diameters downstream. You can evaluate your results afterwards to see if there is any interference with the edges of the domain.
you mean the size of dimension text on a 2D drawing?
The actual domain size, that is wind tunnel size.
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