I came across an interesting site, unfortunately it's all in German. A page details how he works as an engineer dealing with heat-transfer issues in electronic devices, and how he adapted computer simulation models to calculate water flow in aquariums based on how filter intake/outlets are laid out.
Google translation does an OK job:
Original article if you can read German:
Aquarium - Strömungsverteilung
Sadly he only tests out two filter intake/outlet setups, one where the inlet and outlet are on opposite sides of the tank (i.e. left back corner inlet, right back outlet) and one where both inlet/outlet are in the same corner. Oh, and where Google Translate spits out "pelvic region", the original text actually means to say "tank region"! Quite a funny translation.
His conclusion was simply that no matter which model he took, he ended up with dead spots, and he actually designed his aquascapes around the simulated models, like by placing bogwood where dead spots are likely to form, etc.