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Stability of a stratified shear flow, a model of mud flow

Harang, Alice and Thual, Olivier and Brancher, Pierre and Bonometti, Thomas Stability of a stratified shear flow, a model of mud flow. (2010) In: .

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Official URL: http://dx.doi.org/10.5150/revue-paralia.2010.008


To improve the understanding of mud suspension in estuaries, a parametric stability analysis of a two-dimensional shear flow was carried out with a model of two miscible fluid layers of different mass density and dynamic viscosity. The direct numerical simulation code JADIM of IMFT (Institut de Mécanique des Fluides de Toulouse) is used to compute the temporal evolution of these flows. This study is completed by a linear stability study realized with the code LiSa developed at IMFT. A critical Richardson number close to 0.25 is observed. Results show that the characteristics of the most unstable modal wave number and the location of the interface instability, depend on the ratio of two fluid viscosity values. The model is initialized with continuous erf(z) vertical profiles for all quantities. Likely outcomes of this stability study are new parameterizations for realistic modelling of estuaries.

Item Type:Conference or Workshop Item (UNSPECIFIED)
Audience (journal):National 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)
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Deposited On:23 Sep 2013 09:29

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