A semi-Lagrangian splitting method for the numerical simulation of sediment transport with free surface flows

Boyaval, Sébastien (Université Paris-Est (Ecole des Ponts), Chatou, France) ; Caboussat, Alexandre (Haute école de gestion de Genève, HES-SO // Haute Ecole Spécialisée de Suisse Occidentale) ; Mrad, Arwa (Ecole polytechnique fédérale de Lausanne, Switzerland) ; Picasso, Marco (Ecole polytechnique fédérale de Lausanne, Switzerland) ; Steine, Gilles (Ecole polytechnique fédérale de Lausanne, Switzerland ; Ycoor Systems SA, Sierre, Switzerland)

We present a numerical model for the simulation of 3D poly-dispersed sediment transport in a Newtonian flow with free surfaces. The physical model is based on a mixture model for multiphase flows. The Navier–Stokes equations are coupled with the transport and deposition of the particle concentrations, and a volume-of-fluid approach to track the free surface between water and air. The numerical algorithm relies on operator-splitting to decouple advection and diffusion phenomena. Two grids are used, based on unstructured finite elements for diffusion and an appropriate combination of the characteristics method with Godunov’s method for advection on a structured grid. The numerical model is validated through numerical experiments. Simulation results are compared with experimental results in various situations for mono-disperse and bi-disperse sediments, and the calibration of the model is performed using, in particular, erosion experiments.


Keywords:
Article Type:
scientifique
Faculty:
Economie et Services
School:
HEG - Genève
Institute:
CRAG - Centre de Recherche Appliquée en Gestion
Subject(s):
Economie/gestion
Date:
2018-08
Pagination:
13 p.
Published in:
Computers & fluids
Numeration (vol. no.):
2018, vol. 172, pp. 384-396
DOI:
ISSN:
0045-7930
Appears in Collection:



 Record created 2018-05-28, last modified 2019-11-28

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