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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25485

Title: Lagrangian chaos, Eulerian chaos, and mixing enhancement in converging–diverging channel flows
Authors: Amon, Cristina H.
Guzmán, Amador M.
Morel, Benoit
Keywords: CHAOTIC SYSTEMS
POINCARE MAPPING
FLUID FLOW
NAVIER−STOKES EQUATIONS
BIFURCATION
TRAJECTORIES
ADVECTION
MIXING
TURBULENCE
ATTRACTORS
Issue Date: Jan-1996
Publisher: American Institute of Physics
Citation: Amon CH, Guzmán AM, Morel B. Lagrangian chaos, eulerian chaos, and mixing enhancement in converging-diverging channel flows. Physics of Fluids. 1996;8(5):1192-206.
Series/Report no.: Physics of Fluids
Vol. 8 No. 5
Abstract: A study of Lagrangian chaos, Eulerian chaos, and mixing enhancement in converging–diverging channel flows, using spectral element direct numerical simulations, is presented. The time‐dependent, incompressible Navier–Stokes and continuity equations are solved for laminar, transitional, and chaotic flow regimes for 100≤Re≤850. Classical fluid dynamics representations and dynamical system techniques characterize Eulerian flows, whereas Lagrangian trajectories and finite‐time Lagrangian Lyapunov exponents identify Lagrangian chaotic flow regimes and quantify mixing enhancement. Classical representations demonstrate that the flow evolution to an aperiodic chaotic regime occurs through a sequence of instabilities, leading to three successive supercritical Hopf bifurcations. Poincaré sections and Eulerian Lyapunov exponent evaluations verify the first Hopf bifurcation at 125<Re<150 and the onset of Eulerian chaos at Re≊550. Lagrangian trajectories and finite‐time Lagrangian Lyapunov exponents reveal the onset of Lagrangian chaos, its relation with the appearance of the first Hopf bifurcation, the interplay between Lagrangian and Eulerian chaos, and the coexistence of Lagrangian chaotic flows with Eulerian nonchaotic velocity fields. Last, Lagrangian and Eulerian Lyapunov exponents are used to demonstrate that the onset of Eulerian chaos coincides with the spreading of a strong Lagrangian chaotic regime from the vortex region to the whole fluid domain.
Description: Originally published in Physics of Fluids vol. 8 no. 5. Copyright of American Institute of Physics. AIP holds all copyright of this article. AIP allows the final published version of author's own work to be deposited in institutional repositories.
URI: http://pof.aip.org/resource/1/phfle6/v8/i5/p1192_s1
http://dx.doi.org/10.1063/1.868910
http://hdl.handle.net/1807/25485
ISSN: 1070-6631
Appears in Collections:Faculty of Applied Science and Engineering Office of the Dean

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