Another place where random strategies can help. If the turbines are placed effectively randomly rather than rigidly in a grid, any direction will be as good as any other (within a small margin).
You don't want random, since that will may place things too close to each other. You want something area filling and which minimizes alignments, with weights based on the prevailing winds.
Agreed - standard principle: random processes clump.
You want something pseudo-random with good spacing, something like a Golden Ratio Spiral. It's suggested that plants use the golden ratio so that leaves shade each other less, because each revolution the leaves still don't line up. This is because the golden ratio is the irrational that is hardest to approximate with rationals, and that's because it's the solution/value of the Continued Fraction 1/(1+1/(1+1/(1+...))).
