Designing Multishape Dual-Gas Initial Conditions for the Study of Hydrodynamic Instabilities
- 7 February 2022
- journal article
- research article
- Published by ASME International in Journal of Fluids Engineering
- Vol. 144 (4)
- https://doi.org/10.1115/1.4052826
Abstract
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 degrees 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 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.Keywords
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