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Comptes Rendus Mathématique
Volume 337, n° 12
pages 815-818 (décembre 2003)
Doi : 10.1016/j.crma.2003.09.036
Received : 16 December 2002 ;  accepted : 15 September 2003
Equivariant cosymmetry and front solutions of the Dubreil-Jacotin-Long equation. Part 2: Exact solutions

Nikolai  Makarenko
Lavrentyev Institute of Hydrodynamics, Lavrentyev av., 15, 630090 Novosibirsk, Russia 

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The paper concerns existence of exact solutions of the Dubreil-Jacotin-Long equation describing large amplitude internal fronts in a continuously stratified fluid. The proof uses cosymmetric variant of the implicit function theorem based on the group invariance of the variational functional for DJL operator. Supercritical branching occurs near approximate front solutions at the boundary of continuous spectrum of the problem linearized with respect to the basic uniform flow. To cite this article: N. Makarenko, C. R. Acad. Sci. Paris, Ser. I 337 (2003).

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Cette Note traite de l'existence de solutions exactes de l'équation de Dubreil-Jacotin-Long (DJL), qui décrivent les fronts internes de grande amplitude dans un fluide continûment stratifié. La démonstration utilise une variante du théorème des fonctions implicites en présence d'une cosymétrie, basée sur le groupe d'invariance de la fonctionnelle variationnelle de l'opérateur de DJL. Une bifurcation supercritique a lieu au bord du spectre continu du problème linéarisé au voisinage de l'écoulement primaire. Pour citer cet article : N. Makarenko, C. R. Acad. Sci. Paris, Ser. I 337 (2003).




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