On the role of pressure in elasto-inertial turbulence

[en] The dynamics of elasto-inertial turbulence is investigated numerically from the perspective of the coupling between polymer dynamics and flow structures. In particular, direct numerical simulations of channel flow with Reynolds numbers ranging from 1000 to 6000 are used to study the formation and dynamics of elastic instabilities and their effects on the flow. Based on the splitting of the pressure into inertial and polymeric contributions, it is shown that the polymeric pressure is a non-negligible component of the total pressure fluctuations, although the rapid inertial part dominates. Unlike Newtonian flows, the slow inertial part is almost negligible in elasto-inertial turbulence. Statistics on the different terms of the Reynolds stress transport equation also illustrate the energy transfers between polymers and turbulence and the redistributive role of pressure. Finally, the trains of cylindrical structures around sheets of high polymer extension that are characteristics of elasto-inertial turbulence are shown to be correlated with the polymeric pressure fluctuations.

Disciplines :

Chemical engineering
Mechanical engineering

Author, co-author :

Terrapon, Vincent ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents

Dubief, Yves; University of Vermont

Soria, Julio; Monash University

Language :

English

Title :

On the role of pressure in elasto-inertial turbulence

Publication date :

September 2014

Journal title :

Journal of Turbulence

ISSN :

1468-5248

Publisher :

Taylor & Francis Ltd

Volume :

Issue :

Pages :

26-43

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://dx.doi.org/10.1080/14685248.2014.952430

European Projects :

FP7 - 304073 - VISCELTURBFLOW - Computational study of macro- and microscopic turbulence controlled by polymer additives

Funders :

CE - Commission Européenne [BE]

Available on ORBi :

since 04 September 2014

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