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Slumping of non-Boussinesq density currents of various initial fractional depths: a comparison between direct numerical simulations and a recent shallow-water model

Bonometti, Thomas and Balachandar, Sivaramakrishnan Slumping of non-Boussinesq density currents of various initial fractional depths: a comparison between direct numerical simulations and a recent shallow-water model. (2010) Computers and Fluids, 39 (4). 729-734. ISSN 0045-7930

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Official URL: http://dx.doi.org/10.1016/j.compfluid.2009.11.008

Abstract

Simulations of non-Boussinesq density currents of various initial fractional depths are performed, and a detailed comparison with a recent shallow-water model [18] is done for a wide range of density ratio 10̄4 ≤ ρc/ρa ≤ 104 and initial depth ratio 1 ≤ H* ≤ 50 in the regime of constant-speed initial phase. Good agreement is observed in a large region of the parameter space. The larger discrepancy is observed in the range of high H* and low-ρc/ρa for which the shallow-water model overpredicts the velocity of the current. Two possible reasons are suspected, namely the fluid motion in the ambient fluid which is not accounted for in the model, and the choice of the model for the front condition.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF can be found at Computers and Fluids website: http://www.sciencedirect.com/science/article/pii/S0045793009001819
HAL Id:hal-00862620
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: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)
Other partners > University of Florida (USA)
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Deposited On:17 Sep 2013 08:55

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