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On the non-linear stability of the 1:1:1 ABC flow

Identifieur interne : 00D680 ( Main/Exploration ); précédent : 00D679; suivant : 00D681

On the non-linear stability of the 1:1:1 ABC flow

Auteurs : O. Podvigina [Russie, Royaume-Uni, France, Australie] ; A. Pouquet [France]

Source :

RBID : ISTEX:53F9C2773ACBF444CFDDC9AA100A1953BE0562E0

Descripteurs français

English descriptors

Abstract

Abstract: ABC flows which can be considered as prototypes for the study of the onset of three-dimensional spatio-temporal turbulence are known both analytically and numerically to be linearly unstable. We analyze the nonlinear evolution of the ABC flow A1 with A = B = C = 1 and with characteristic wavenumber k0 = 1 in the interval of Reynolds number 13 ≤ R ≤ 50. We solve numerically the forced Navier-Stokes equations with periodic boundary conditions for up to 9.9 × 104 eddy turnover times. Bifurcations towards progressively more complex flows obtain, with a relaminarization window, loss of symmetries, and chaotic oscillations probably revealing an underlying heteroclinic structure. In the chaotic regime, only three steady solutions emerge besides A1; they consist of a perturbed ABC flowA2 with A = B ≠ C plus cyclic permutations. At 23 ≤ R ≤ 50 an unstructured temporal chaos is observed with the flow still dominated by the largest scales.

Url:
DOI: 10.1016/0167-2789(94)00031-X


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<term>Corresponding frequency spectrum</term>
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<term>Reynolds</term>
<term>Reynolds number</term>
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<term>Small reynolds number</term>
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<term>Spatial resolution</term>
<term>Stable manifold</term>
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<term>Steady flows</term>
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<term>Study institute</term>
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<term>Temporal chaos</term>
<term>Temporal evolution</term>
<term>Temporal frequency spectrum</term>
<term>Temporal schemes</term>
<term>Third component</term>
<term>Time intervals</term>
<term>Time step</term>
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<term>Total energy</term>
<term>Transition phase</term>
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<term>Turnover time</term>
<term>Turnover times</term>
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<div type="abstract" xml:lang="en">Abstract: ABC flows which can be considered as prototypes for the study of the onset of three-dimensional spatio-temporal turbulence are known both analytically and numerically to be linearly unstable. We analyze the nonlinear evolution of the ABC flow A1 with A = B = C = 1 and with characteristic wavenumber k0 = 1 in the interval of Reynolds number 13 ≤ R ≤ 50. We solve numerically the forced Navier-Stokes equations with periodic boundary conditions for up to 9.9 × 104 eddy turnover times. Bifurcations towards progressively more complex flows obtain, with a relaminarization window, loss of symmetries, and chaotic oscillations probably revealing an underlying heteroclinic structure. In the chaotic regime, only three steady solutions emerge besides A1; they consist of a perturbed ABC flowA2 with A = B ≠ C plus cyclic permutations. At 23 ≤ R ≤ 50 an unstructured temporal chaos is observed with the flow still dominated by the largest scales.</div>
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