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Transition to Turbulence in Viscoelastic Channel Flow
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-4346-4732
2015 (English)In: Procedia IUTAM, Elsevier, 2015, 519-526 p.Conference paper, Published paper (Refereed)
Abstract [en]

The influence of viscoelasticity on bypass transition to turbulence in channel flow is studied using data from direct numerical simulations by Agarwal et al. (2014) 1. The initial field is a superposition of a laminar base state and a localized disturbance. Relative to the Newtonian conditions, the polymeric FENE-P flow delays the onset of transition and extends its duration. The former effect is due to a weakening of the pre-transitional disturbance field, while the prolonged transition region is due to a slower spreading rate of the turbulent spots. Once turbulence occupies the full channel, a comparison of the turbulence fields shows that energetic flow structures are longer and wider in the polymeric flow. The final turbulent state is compared to elasto-inertial turbulence (EIT), where the polymer conformation field takes the form of elongated sheets with wide spanwise extent. © 2015 The Authors.

Place, publisher, year, edition, pages
Elsevier, 2015. 519-526 p.
Keyword [en]
Channel flow, Polymers, Turbulent flow, Viscoelasticity, Bypass transition, Disturbance field, Polymer conformation, Transition regions, Transition to turbulence, Turbulence fields, Turbulent spots, Turbulent state, Turbulence
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-176124DOI: 10.1016/j.piutam.2015.03.083ISI: 000380499200060Scopus ID: 2-s2.0-84940666204OAI: oai:DiVA.org:kth-176124DiVA: diva2:866197
Conference
8th IUTAM-ABCM Symposium on Laminar Turbulent Transition, LTT 2014, 8 September 2014 through 12 September 2014
Note

QC 20151102

Available from: 2015-11-02 Created: 2015-11-02 Last updated: 2016-08-30Bibliographically approved

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Brandt, Luca

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