Convective and Absolute Eckhaus Instability Leading to Modulated Waves in a Finite Box

Nicolas Garnier; Arnaud Chiffaudel; François Daviaud

Convective and Absolute Eckhaus Instability Leading to Modulated Waves in a Finite Box

Nicolas Garnier ¹ Arnaud Chiffaudel ¹ François Daviaud ^{1, 2}

1 SPEC - UMR3680 - Service de physique de l'état condensé

2 SPHYNX - Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes

SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay

Abstract : We report experimental study of the secondary modulational instability of a one-dimensional nonlinear traveling wave in a long bounded channel. Two qualitatively different instability regimes involving fronts of spatio-temporal defects are linked to the convective and absolute nature of the instability. Both transitions appear to be subcritical. The spatio-temporal defects control the global mode structure.

Document type :

Journal articles

Domain :

Physics [physics]

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https://hal-cea.archives-ouvertes.fr/cea-01373861
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Submitted on : Thursday, September 29, 2016 - 12:09:18 PM
Last modification on : Thursday, February 7, 2019 - 3:21:08 PM
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