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Simulations of rotating planar and cylindrical gravity currents

Salinas, Jorge and Cantero, Mariano and Bonometti, Thomas Simulations of rotating planar and cylindrical gravity currents. (2013) In: XX congreso sobre Métodos Numéricos y sus Aplicaciones - ENIEF 2013, 19 November 2013 - 22 November 2013 (Mendoza, Argentina). (Unpublished)

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Abstract

Gravity currents are generated by the action of gravity (or other volumetric force) on changes in fluid density. When they appear in turbulent regime, gravity currents are of a non-linear nature and have a wide range of temporal and spatial scales. In these systems there is a strong coupling between turbulence and stratification effects, with important consequences in the exchange of mass, momentum and energy. When these type of flows happen in geophysical scale, the analysis is further complicated by the influence of rotation effects by the Coriolis forces originated by earth's rotation. In this work we address the rotational effects in gravity currents with cylindrical initial condition by menas of direct numerical simulations (DNS). We report results on five three-dimensional DNS with grid resolutions up to 166-million points, with different boundary conditions, Reynolds numbers (Re=4000 and Re=8000), and different conditions of rotation. The results focus mainly on the distance of propagation of the fronts, frequency of the successive outward fronts, and the turbulent structures present in the currents and their influence in flow dynamics.

Item Type:Conference or Workshop Item (UNSPECIFIED)
Audience (conference):International conference without published proceedings
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 - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:02 Jul 2014 09:17

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