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Duguet, Y.; Willis, A. P.; Kerswell, R. R.
Transition in pipe flow: The saddle structure on the boundary of turbulence. (English) Zbl 1151.76495
J. Fluid Mech. 613, 255-274 (2008).
Summary: The laminar-turbulent boundary \(\varSigma \) is the set separating initial conditions which relaminarize uneventfully from those which become turbulent. Phase space trajectories on this hypersurface in cylindrical pipe flow appear to be chaotic and show recurring evidence of coherent structures. A general numerical technique is developed for recognizing approaches to these structures and then for identifying the exact coherent solutions themselves. Numerical evidence is presented which suggests that trajectories on \(\varSigma \) are organized around only a few travelling waves and their heteroclinic connections. If the flow is suitably constrained to a subspace with a discrete rotational symmetry, it is possible to find locally attracting travelling waves embedded within \(\varSigma \). Four new types of travelling waves were found using this approach.

Cited in 30 Documents
MSC:
76F06 Transition to turbulence
Software:
channelflow
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\textit{Y. Duguet} et al., J. Fluid Mech. 613, 255--274 (2008; Zbl 1151.76495)
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