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Turbulent structures in cylindrical density currents in a rotating frame of reference

Salinas, Jorge and Cantero, Mariano and Dari, Enzo and Bonometti, Thomas Turbulent structures in cylindrical density currents in a rotating frame of reference. (2018) Journal of Turbulence, 19 (6). 463-492. ISSN 1468-5248

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Official URL: https://doi.org/10.1080/14685248.2018.1462496

Abstract

Gravity currents are flows generated by the action of gravity on fluids with different densities. In some geophysical applications, modeling such flows makes it necessary to account for rotating effects, modifying the dynamics of the flow. While previous works on rotating stratified flows focused on currents of large Coriolis number, the present work focuses on flows with small Coriolis numbers (i.e. moderate-tolarge Rossby numbers). In this work, cylindrical rotating gravity currents are investigated by means of highly resolved simulations. A brief analysis of the mean flow evolution to the final state is presented to provide a complete picture of the flow dynamics. The numerical results, showing the well-known oscillatory behavior of the flow (inertialwaves) and a final state lens shape (geostrophic adjustment), are in good agreement with experimental observations and theoretical models. The turbulent structures in the flow are visualized and described using, among others, a stereoscopic visualization and videos as supplementary material. In particular, the structure of the lobes and clefts at the front of the current is presented in association to local turbulent structures. In rotating gravity currents, the vortices observed at the lobes front are not of hairpin type but are rather of Kelvin-Helmholtz type.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Comisión Nacional de Energía Atómica - CNEA (ARGENTINA)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Consejo Nacional de Investigaciones Científicas y Técnicas - CONICET (ARGENTINA)
Laboratory name:
Funders:
ANPCyT (Fondo para la Investigación Científica y Tecnológica) - INPT - Scientific Groupment CALMIP
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Deposited By: Thomas BONOMETTI
Deposited On:28 Nov 2018 11:06

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