Turbulence

>>9100426
Fluid dynamics is not well enough understood, yes.

It's not exactly mysterious, fluids have viscosity, density, energy... with enough computing power you could model turbulence pretty well.
The problem is there's no neat little equation describing turbulent flow so you have to use dirty numerical methods and approximations.

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>>9100426

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>>9100426
It's related to the distribution of the zeros along the critical line, don't ask me how.

>>9100445
not to mention the use of the ideal gas equation in fluid mechanics which is actually a theoretical gas, since no gas is ideal

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>supersonic turbulent flow

>>9100426
>>9100445
Actually for the most part we still don't completely know how turbulence is formed and certain key properties concerning it.
>>9100563
Since the inter-molecular force in air are quite weak they don't really come into play, now in plasma physics (specifically magneto-hydrodynamics) this does become relevant

"If particle physics is the dazzling crown prince of science, fluid mechanics is the cantankerous Queen Mother: While her loyal subjects flatter her as being rich, mature, and insightful, many consider her to be demode, uninteresting, and difficult.In her youth, she was more attractive. Her inconsistencies were taken as paradoxes that bestowed on her an air of depth and mystery. The resolution of her paradoxes left her less beguiling abut more powerful, and marked her coming of age. She has since seen it all and has weighed in on topics ranging from cosmology to astronautics. Scientists are currently exploring whether she has any wisdom to offer on the controversial subject of quantum foundations." - John Bush, for Physics Today (August 2015)

>>9100426
It's not really a mystery, we just can't model it. There's nothing unintuitive or surprising about the problem if that is what you are asking. The issue is that we have no good way of studying it in general. It's hard to make interesting or useful claims about a turbulent system because of how limited our methods are in modeling it. We can't really even simulate turbulence that we'll, since the equations lend themselves to a lot of energy drift when you try to solve them numerically. So it's more of just a hard problem than it is a mysterious one.