Reference : A New State of Turbulence: Elasto-Inertial Turbulence
Scientific congresses and symposiums : Unpublished conference
Engineering, computing & technology : Mechanical engineering
http://hdl.handle.net/2268/134921
A New State of Turbulence: Elasto-Inertial Turbulence
English
Dubief, Yves mailto [University of Vermont - UVM > Mechanical Engineering > M2CE > >]
Samanta, Devranjan [Max Planck Institute for Dynamics and Self-Organization > Complex dynamics and turbulence > > >]
Holzner, Markus [Max Planck Institute for Dynamics and Self-Organization > Complex dynamics and turbulence > > >]
Schäfer, Christof [Saarland University > Experimental Physics > > >]
Morozov, Alexander [University of Edinburgh > School of Physics & Astronomy > > >]
Wagner, Christian [Saarland University > Experimental Physics > > >]
Hof, Björn [Max Planck Institute for Dynamics and Self-Organization > Complex dynamics and turbulence > > >]
Terrapon, Vincent mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents >]
Soria, Julio [Monash University > Mechanical Engineering > Laboratory for Turbulence Research in Aerospace & Combustion > >]
20-Nov-2012
http://meeting.aps.org/Meeting/DFD12/Event/179300
No
International
American Physical Society 65th Annual Fall DFD Meeting
November 18-20, 2012
American Physical Society
San Diego
USA
[en] Elasto-inertial turbulence ; polymers ; viscoelastic ; transition ; FENE-P ; drag reduction
[en] The elasticity of polymer solutions is found to generate a new state of turbulence, elasto-inertial turbulence (EIT), characterized by an interplay between elastic and flow instabilities. Experiments and direct numerical simulations (DNS) in pipe and channel flows demonstrate the emergence of EIT at Reynolds numbers much lower than the critical Reynolds number for transition to turbulence in Newtonian flows. EIT causes the friction factor to deviate from the laminar solution and subsequently transition to the maximum drag reduction asymptote around Re=1800. EIT is a self-sustained mechanism that arises from the interactions between fluctuations of extensional viscosity, velocity and pressure. The polymer solution elasticity controls the growth of flow instability, resulting in transitional-like flows at high Reynolds numbers. The existence of EIT is not limited to pipe, channel or boundary layer flows, and evidence of EIT will be discussed in other flows, including natural convection using DNS.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/134921
FP7 ; 304073 - VISCELTURBFLOW - Computational study of macro- and microscopic turbulence controlled by polymer additives

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