Near-wall turbulence in a localized puff in a pipe

Alexander Yakhot, Yuri Feldman, David Moxey, Spencer Sherwin, George Em Karniadakis

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We have performed direct numerical simulations of a transitional flow in a pipe for Rem=2250 when turbulence manifests in the form of fleshes (puffs). From experiments and simulations, Rem ≈ 2250 has been estimated as a threshold when the average speeds of upstream and downstream fronts of a puff are identical (Song et al. in J Fluid Mech 813:283–304, 2017, [1]). The flow regime upstream of its trailing edge and downstream of its leading edge is almost laminar. To collect the velocity data, at each time instance, we followed a turbulent puff by a three-dimensional moving window centered at the location of the maximum energy of the transverse (turbulent) motion. In the near-wall region, despite the low Reynolds number, the turbulence statistics, in particular, the distribution of turbulence intensities and Reynolds shear stress becomes similar to a fully-developed turbulent pipe flow.

Original languageEnglish
Title of host publicationProgress in Turbulence VIII - Proceedings of the iTi Conference in Turbulence 2018
EditorsRamis Örlü, Alessandro Talamelli, Joachim Peinke, Martin Oberlack
PublisherSpringer Science and Business Media, LLC
Pages15-20
Number of pages6
ISBN (Print)9783030221959
DOIs
StatePublished - 1 Jan 2019
Event8th iTi Conference on Turbulence, 2018 - Bertinoro, Italy
Duration: 3 Sep 20187 Sep 2018

Publication series

NameSpringer Proceedings in Physics
Volume226
ISSN (Print)0930-8989
ISSN (Electronic)1867-4941

Conference

Conference8th iTi Conference on Turbulence, 2018
Country/TerritoryItaly
CityBertinoro
Period3/09/187/09/18

ASJC Scopus subject areas

  • General Physics and Astronomy

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