O. Enparalì-ele, Ils parviennentàparviennentà retrouver quelque-uns de nos points expérimentaux En collaboration avec l'institut d'Alembert, dans le cadre de l'ANR VAA et du projet européen FIRST, nous avons mis enévidenceenévidence qu'une telle transition convectif-absolu se produisait au milieu de nos gammes typiques de mesures : pour un U g fixé, la transition se produitàproduità un rapport M critique, audeì a duquel le régime devient absolu Une transition analogue est observée lorsque le ratio e/? g est augmenté. La transition observée sur les spectres expérimentaux est retrouvée sur les simulations numériques effectuéeseffectuéesà l'aide du code GerrisàGerrisà l'institut d'Alembert. La principale différence réside dans le M de transition, plusélevéplusélevé sur les expériences : cette différence s'explique probablement par le rapport de densité réduit utilisé en simulation (Fuster et al 2013 Ces résultats, qui sont le fruit d'allers-retours entre expériences et simulations, permettentégalementpermettentégalement d'´ eclaircir pourquoi l'analyse visqueuse temporellé echouaitàechouaità prédire les fréquences : le caractère absolu doit impérativementimpérativementêtre pris en compte dans l'analyse visqueuse. Nous avonségalementétudiéavonségalementavonségalementétudié expérimentalement l'influence d'une réduction de l'´ epaisseur liquide H l sur la fréquence et le taux de croissance de l'instabilité. Les résultats montrent qu'une diminution de H l conduitàconduità une augmentation de fréquence. Cette augmentation devient non négligeable lorsque H l est inférieurinférieurà 4 mm. Cette tendance n'est pas celle prédite par l'analyse de stabilité inviscide avec déficit de vitesse. Le taux de croissance mesuré a quantàquantà lui un comportement non monotone en fonction de H l . CetéchecCetéchec de l'analyse de stabilité peut s'expliquer en partie par l'influence du profil de vitesse liquide, qui reste mal connu pour les petits H l . En résumé nous avons montré que l'analyse de stabilité inviscide capturait correctement les fréquences expérimentales, maiséchouaitmaiséchouait totalementàtotalementà prédire le taux de croissance. Une analyse spatio-temporelle avec viscosité permet de prédire une partie des fréquences expérimentales, lorsque l'instabilité est absolue : lorsque la prédiction est en régime convectif, elle est cependant en désaccord avec l'expérience. Par ailleurs il est connu que le confinement peut lui-même déclencher une instabilité absolue analoguè a celle observée précédemment : il faudrait certainement prendre en compte ce, probì eme initialement mis enévidenceenévidence lors de la thèse de Ben Rayana [13] : des fréquences différentes peuventêtrepeuventêtre observées pour des conditions de vitesse gaz, de vitesse liquide et plus généralement des profils moyens de vitesses en entrée identiques, 2013.

. Nous-avonségalementavonségalement, Institut d'Alembert, montré que la déstabilisation de ces vagues conduisaitàconduisaità un mécanisme original d'´ ejection de gouttes : ce mécanisme, observé dans les

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