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Suspension-Driven gravity surges on horizontal surfaces: Effect of the initial shape

Zgheib, Nadim and Bonometti, Thomas and Balachandar, Sivaramakrishnan Suspension-Driven gravity surges on horizontal surfaces: Effect of the initial shape. (2017) Computers and Fluids, 158. 84-95. ISSN 0045-7930

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Official URL: https://doi.org/10.1016/j.compfluid.2017.03.016

Abstract

We present results from highly resolved direct numerical simulations of canonical (axisymmetric and pla- nar) and non-canonical (rectangular) configurations of horizontal suspension-driven gravity surges. We show that the dynamics along the initial minor and major axis of a rectangular release are roughly sim- ilar to that of a planar and axisymmetric current, respectively. However, contrary to expectation, we ob- serve under certain conditions the final extent of the deposit from finite releases to surpass that from an equivalent planar current. This is attributed to a converging flow of the particle-laden mixture toward the initial minor axis, a behaviour that was previously reported for scalar-driven currents on uniform slopes [31]. This flow is observed to be correlated with the travelling of a perturbation wave generated at the extremity of the longest side that reaches the front of the shortest side in a finite time. A semi-empirical explicit expression (based on established relations for planar and axisymmetric currents) is proposed to predict the extent of the deposit in the entire x - y plane. Finally, we observe that for the same initial volume of a suspension-driven gravity surge, a release of larger initial horizontal aspect-ratio is able to retain particles in suspension for longer periods of time.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at http://www.sciencedirect.com/science/article/pii/S0045793017300968
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)
Laboratory name:
Funders:
ExxonMobil Upstream Research - French Embassy in the USA - National Science Foundation Partnership for International Research and Education (PIRE) - Scientific Groupment CALMIP
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Deposited On:15 May 2017 12:17

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