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Phys. Fluids 14, 3475 (2002); doi:10.1063/1.1502658 (10 pages)

Transient growth in Taylor–Couette flow

Hristina Hristova1,2, Sébastien Roch1,2, Peter J. Schmid3,4, and Laurette S. Tuckerman5,2

1Ecole Polytechnique de Montréal, C.P. 6079, succ. Centre-ville, Montréal, Quebec H3C 3A7, Canada
2Ecole Polytechnique, 91128 Palaiseau, France
3Department of Applied Mathematics, University of Washington, Box 352420, Seattle, Washington 98195
4Laboratoire pour l’Hydrodynamique à l’Ecole Polytechnique (LADHYX-CNRS), 91128 Palaiseau, France
5Laboratoire d’Informatique pour la Mécanique et les Sciences de l’Ingénieur (LIMSI-CNRS), B.P. 133, 91403 Orsay Cedex, France

(Received 5 September 2001; accepted 2 July 2002; published online 5 September 2002)

Transient growth due to non-normality is investigated for the Taylor–Couette problem with counter-rotating cylinders as a function of aspect ratio η and Reynolds number Re. For all Re ⩽ 500, transient growth is enhanced by curvature, i.e., is greater for η<1 than for η = 1, the plane Couette limit. For fixed Re<130 it is found that the greatest transient growth is achieved for η between the Taylor–Couette linear stability boundary, if it exists, and one, while for Re>130 the greatest transient growth is achieved for η on the linear stability boundary. Transient growth is shown to be approximately 20% higher near the linear stability boundary at Re = 310, η = 0.986 than at Re = 310, η = 1, near the threshold observed for transition in plane Couette flow. The energy in the optimal inputs is primarily meridional; that in the optimal outputs is primarily azimuthal. Pseudospectra are calculated for two contrasting cases. For large curvature, η = 0.5, the pseudospectra adhere more closely to the spectrum than in a narrow gap case, η = 0.99. © 2002 American Institute of Physics.

© 2002 American Institute of Physics

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ISSN:

1070-6631 (print)  
1089-7666 (online)

For access to fully linked references, you need to log in.
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