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Travelling wave states in pipe flow

Published online by Cambridge University Press:  22 February 2016

Ozge Ozcakir
Affiliation:
School of Mathematical Sciences, Monash University, Clayton, VIC 3800, Australia
Saleh Tanveer
Affiliation:
Department of Mathematics, The Ohio State University, Columbus, OH 43210, USA
Philip Hall*
Affiliation:
School of Mathematical Sciences, Monash University, Clayton, VIC 3800, Australia
Edward A. Overman II
Affiliation:
Department of Mathematics, The Ohio State University, Columbus, OH 43210, USA
*
Email address for correspondence: philhall@ic.ac.uk

Abstract

In this paper, we have found two new nonlinear travelling wave solutions in pipe flows. We investigate possible asymptotic structures at large Reynolds number $R$ when wavenumber is independent of $R$ and identify numerically calculated solutions as finite $R$ realizations of a nonlinear viscous core (NVC) state that collapses towards the pipe centre with increasing $R$ at a rate $R^{-1/4}$. We also identify previous numerically calculated states as finite $R$ realizations of a vortex wave interacting (VWI) state with an asymptotic structure similar to the ones in channel flows studied earlier by Hall & Sherwin (J. Fluid Mech., vol. 661, 2010, pp. 178–205). In addition, asymptotics suggests the possibility of a VWI state that collapses towards the pipe centre like $R^{-1/6}$, though this remains to be confirmed numerically.

Type
Papers
Copyright
© 2016 Cambridge University Press 

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