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Spreading of non-planar non-axisymmetric gravity and turbidity currents

Zgheib, Nadim and Bonometti, Thomas and Balachandar, Sivaramakrishnan Spreading of non-planar non-axisymmetric gravity and turbidity currents. (2014) In: 67th Annual Meeting of the APS Division of Fluid Dynamics, 23 November 2014 - 25 November 2014 (San Francisco, United States). (Unpublished)

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Abstract

The dynamics of non-axisymmetric turbidity currents is considered here. The study comprises a series of experiments for which a finite volume of particle-laden solution is released into fresh water. A mixture of water and polystyrene particles of diameter 280<Dp<315μm and density ρc=1007Kg/m3 is initially confined in a hollow cylinder at the center of a large tank filled with fresh water. Cylinders with four different cross-sections are examined: a circle, a plus-shape, a rectangle and a rounded rectangle in which the sharp corners are smoothened. The time evolution of the front is recorded as well the spatial distribution of the thickness of the final deposit via the use of a laser triangulation technique. The dynamics of the front and final deposit are significantly influenced by the initial geometry, displaying substantial azimuthal variation especially for the rectangular case where the current extends farther and deposits more particles along the initial minor axis of the rectangular cross section. Interestingly, this departure from axisymmetry cannot be predicted by current theoretical methods such as the Box Model. Several parameters are varied to assess the dependence on the settling velocity, initial height aspect ratio, local curvature and mixture density.

Item Type:Conference or Workshop Item (Lecture)
Audience (conference):International conference without published proceedings
Uncontrolled Keywords:
Institution: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 > University of Florida (USA)
Laboratory name:
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Deposited By: Thomas BONOMETTI
Deposited On:16 Mar 2015 13:01

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