Splitting of a turbulent puff in pipe flow

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 :
Article dans une revue
Fluid Dynamics Research, IOP Publishing, 2014, 46, pp.61403. 〈10.1088/0169-5983/46/6/061403〉
Liste complète des métadonnées

Littérature citée [33 références]  Voir  Masquer  Télécharger

https://hal-polytechnique.archives-ouvertes.fr/hal-01102510
Contributeur : Denis Roura <>
Soumis le : lundi 12 janvier 2015 - 21:05:37
Dernière modification le : mardi 20 novembre 2018 - 14:04:02
Document(s) archivé(s) le : samedi 15 avril 2017 - 17:34:52

Fichier

SMDK2014.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Masaki Shimizu, Paul Manneville, Yohann Duguet, Genta Kawahara. Splitting of a turbulent puff in pipe flow. Fluid Dynamics Research, IOP Publishing, 2014, 46, pp.61403. 〈10.1088/0169-5983/46/6/061403〉. 〈hal-01102510〉

Partager

Métriques

Consultations de la notice

220

Téléchargements de fichiers

288