ORIGINAL: Flyboy Dave
XJet....Bernoulli's experiments and theories were about water, not air.
I suspect you're confusing the use of the word "fluid" in Bernoulli's work.
For the purposes of most CFD (look it up), a gas (such as air) is simply a compressible fluid. Mr Bernoulli's work applies to gasflows. Remember, it's often used to explain how a lifting-section airfoil creates lift and it's the driving principle behind the venturis used in most carbies.