Travelling wave states in pipe flow

Ozge Ozcakir, Saleh Tanveer, Philip Hall, Edward A Overman II

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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.
Original languageEnglish
Pages (from-to)284-328
Number of pages45
JournalJournal of Fluid Mechanics
Volume791
DOIs
Publication statusPublished - 2016

Keywords

  • instability
  • nonlinear instability
  • transition to turbulence

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