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Resolvent bounds for pipe Poiseuille flow

Published online by Cambridge University Press:  10 November 2006

PER-OLOV ÅSÉN
Affiliation:
Department of Numerical Analysis and Computer Science, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden
GUNILLA KREISS
Affiliation:
Department of Numerical Analysis and Computer Science, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden

Abstract

We derive an analytical bound on the resolvent of pipe Poiseuille flow in large parts of the unstable half-plane. We also consider the linearized equations, Fourier transformed in axial and azimuthal directions. For certain combinations of the wavenumbers and the Reynolds number, we derive an analytical bound on the resolvent of the Fourier transformed problem. In particular, this bound is valid for the perturbation which numerical computations indicate to be the perturbation that gives the largest transient growth. Our bound has the same dependence on the Reynolds number as given by the computations.

Type
Papers
Copyright
© 2006 Cambridge University Press

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