“Fluid mechanics is the basis of aeronautical engineering.”
Yes, but wouldn’t the results of testing in a denser, non compressible fluid give very different results? Not arguing, looking for someone more knowledgeable than I to explain.
Its easier to see turbulence in water.
Scientifically, ‘fluids’ include gases, liquids, and plasma.
My late uncle was an aero engineer and expert in fluid mechanics. He actually used STP as a medium for testing aero concepts.