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Designing multi-shape dual-gas initial conditions for the study of hydrodynamic instabilities

Rasteiro Dos Santos, Marta and Bury, Yannick and Jamme, Stéphane Designing multi-shape dual-gas initial conditions for the study of hydrodynamic instabilities. (2021) Journal of Fluids Engineering. ISSN 0098-2202

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Official URL: https://doi.org/10.1115/1.4052826


The flow resulting from the rotation of a series of thin plates that initially separate two gases of different densities is analysed using Direct Numerical Simulations. The ninety-degree plates’ rotation forms a vorticity shear layer and a density interface in between the tips of two neighbouring plates. Results of this study show that the shape of these layers strongly depends on the plate’s tip-based Reynolds number that can be varied thanks to a parametrisation of the plates’ opening law. Different regimes are identified corresponding to single- or multi-mode initial interfaces, with or without the occurrence of starting vortices during the formation of the shear layer. The density interfaces resulting from this procedure are particularly well-suited to serve as initial conditions for the study of the Richtmyer- Meshkov instability-induced mixing. Results of this study also provide a description of vortex formation in stratified flows.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:17 Jan 2022 10:32

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