GAO, Zhenlan; PODVIN, Bérengère; SERGENT, Anne; XIN, Shihe

doi:10.1103/PhysRevE.91.013006

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GAO, Zhenlan
Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur [LIMSI]
Université Pierre et Marie Curie - Paris 6 [UPMC]

PODVIN, Bérengère
Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur [LIMSI]

SERGENT, Anne
Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur [LIMSI]
Université Pierre et Marie Curie - Paris 6 [UPMC]

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Physical Review E : Statistical, Nonlinear, and Soft Matter Physics. 2015, vol. 91, n° 1, p. 013006

American Physical Society

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Direct numerical simulation is used to study the air flow between two vertical plates maintained at different temperatures. The periodic dimensions of the plates are small so as to accommodate only one flow structure, which consists of a convection roll with oblique vorticity braids. At lower Rayleigh numbers, the roll and the braids grow and shrink alternatively following a cyclical process. As the Rayleigh number is increased, the flow becomes temporally chaotic through a period-doubling cascade. Windows corresponding to multiperiodic regimes and interior crises are observed. As the Rayleigh number is further increased, the structure intermittently switches between two vertical positions, which is seen to correspond to an “attractor-merging” crisis. The chaotic flow dynamics are characterized and the corresponding physical mechanisms are identified. We show that some of the flow key features, such as the chaotic oscillation and intermittency, can be captured by a low-order model.< Réduire

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Chaotic dynamics of a convection roll in a highly confined, vertical, differentially heated fluid layer

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