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heres a good read www.f1technical.net/articles/47
Wind tunnels are an evolving item, like most items in F1, forever looking for more accurate results.
The 50 m/s (180 km/h) is the actual max speed allowed, but not sure if FIA actually monitor this or generally leave it to teams honesty. Renaults 1999 tunnel used pressurized air to simulate speeds as high as 480 km/h.
Saubers 2004 tunnel uses 3000kW for a 15 square-metre cross-section. It also allows for 2 cars (one behind the other) to be in it, to simulate the slipstreaming capabilities.
And its true that there should be a limit on the number of staff used to do the testing as well.
Sadly, unless F1 cars look & behave like street cars, little of this testing is passed onto them as refinements.