Transient Turbulence in Taylor-Couette Flow

Details Transient Turbulence in Taylor-Couette Flow Transient Turbulence in Taylor-Couette Flow

2009-05-04

arxiv.org/abs/0905.0147v3

Phys. Rev. E 81, 025301(R) (2010)

Physics

Fluid Dynamics

4 pages, 4 figures v2: Addressed referee comments for PRE. Made some cosmetic changes. Added inset to Fig. 4

Scientific paper

10.1103/PhysRevE.81.025301

Recent studies have brought into question the view that at sufficiently high Reynolds number turbulence is an asymptotic state. We present the first direct observation of the decay of turbulent states in Taylor-Couette flow with lifetimes spanning five orders of magnitude. We also show that there is a regime where Taylor-Couette flow shares many of the decay characteristics observed in other shear flows, including Poisson statistics and the coexistence of laminar and turbulent patches. Our data suggest that characteristic decay times increase super-exponentially with increasing Reynolds number but remain bounded in agreement with the most recent data from pipe flow and with a recent theoretical model. This suggests that, contrary to the prevailing view, turbulence in linearly stable shear flows may be generically transient.

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