The splitting of a turbulent puff in pipe flow

Masayuki Shimizu 1, * Paul Manneville 2 Yohann Duguet 3 G. Kawahara 1
* Auteur correspondant
1 Graduate School of Engineering Science
2 LadHyX - Laboratoire d'hydrodynamique
3 LIMSI - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur
Abstract : The transition to turbulence of the flow in a pipe of constant radius is numerically studied over a range of Reynolds numbers where turbulence begins to expand by puff splitting. We first focus on the case Re = 2300 where splitting occurs as discrete events. Around this value only long-lived pseudo-equilibrium puffs can be observed in practice, as typical splitting times become very long. When Re is further increased, the flow enters a more continuous puff splitting regime where turbulence spreads faster. Puff splitting presents itself as a two-step stochastic process. A splitting puff first emits a chaotic pseudopod made of azimuthally localized streaky structures at the downstream (leading) laminar-turbulent interface. This structure can later expand azimuthally as it detaches from the parent puff. Detachment results from a collapse of turbulence over the whole cross-section of the pipe. Once the process is achieved a new puff is born ahead. Large-deviation consequences of elementary stochastic processes at the scale of the streak are invoked to explain the statistical nature of splitting and the Poisson-like distributions of splitting times reported by Avila, Moxey, de Lozar, Avila, Barkley and Hof (2011 Science 333 192-196).
Type de document :
Communication dans un congrès
31st Annual Conference JSST 2012 (International Conference on Simulation Technology), Sep 2012, Port Island, Kobe, Japan. pp.OS5-10, 2012
Liste complète des métadonnées
https://hal-polytechnique.archives-ouvertes.fr/hal-01044637
Contributeur : Denis Roura <>
Soumis le : mercredi 23 juillet 2014 - 21:40:38
Dernière modification le : jeudi 12 avril 2018 - 01:49:21

Identifiants

  • HAL Id : hal-01044637, version 1

Collections

X | X-LADHYX | PARISTECH | LIMSI

Citation

Masayuki Shimizu, Paul Manneville, Yohann Duguet, G. Kawahara. The splitting of a turbulent puff in pipe flow. 31st Annual Conference JSST 2012 (International Conference on Simulation Technology), Sep 2012, Port Island, Kobe, Japan. pp.OS5-10, 2012. 〈hal-01044637〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

108

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD