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Two food for thought points:
1. The eddy currents behind a brick flow back along the sides (boundary continuity) but forward up the center (supply stream). If a diesel pusher's radiator in centered and sucks inward (forward) that would seem to cooperate. If outward (backward) then rear flow might be even more messy and a "typical" solution may need some tweaking for optimization.
2. I don't design fish but I've stared at many. Many are taller than wide and their tails seem to taper to a vertical edge. When I think about big rigs that are considerably taller than wide my imagination wants to overlay fish anatomy.
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