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What causes<br />
turbulence?<br />
Is simply having Re>>>>1 sufficient?<br />
Plane pipe flow is linearly unstable for Re>Rec<br />
plane Couette flow marginally stable but always becomes turbulent<br />
What about a Keplerian flow?<br />
d/dr(Ωr 2 )>0, Rayleigh stable & stable epicyclic response<br />
a stable response hinders a turbulent random walk
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