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Nonlinear dynamics between two differentially heated vertical plates in the presence of stratification

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Abstract

We consider the numerical simulation of the flow between infinite, differentially heated vertical plates with positive stratification. We use a two-dimensional Boussinesq approximation, with periodic boundary conditions in the vertical direction. The relative stratification parameter \({\gamma=(\frac{1}{4}Ra S)^{1/4}}\) , where Ra is the Rayleigh number and S the adimensional stratification, is kept constant and equal to 8. The Prandtl number is 0.71. We derive a complex Ginzburg-Landau equation from the equations of motion. Coefficients are computed analytically, but we find that the domain of validity of these coefficients is small and rely on the numerical simulation to adjust the coefficients over a wider range of Rayleigh numbers. We show that the Ginzburg-Landau equation is able to accurately predict the characteristics of the periodic solution at moderate Rayleigh numbers. Above the primary bifurcation at Ra = 1.63 × 105, the Ginzburg-Landau model is found to be Benjamin-Feir unstable and to be characterized by modulated traveling waves and phase-defect chaos, which is supported by evidence from the DNS. As the Rayleigh number is increased beyond Ra = 2.7 × 105, nonlinearities become strong and the flow is characterized by cnoidal waves.

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  1. LIMSI-CNRS, Orsay, France

    Bérengère Podvin & Patrick Le Quéré

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  1. Bérengère Podvin
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  2. Patrick Le Quéré
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Correspondence to Bérengère Podvin.

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Communicated by Eldredge.

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Podvin, B., Le Quéré, P. Nonlinear dynamics between two differentially heated vertical plates in the presence of stratification. Theor. Comput. Fluid Dyn. 27, 89–114 (2013). https://doi.org/10.1007/s00162-012-0261-2

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