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Theses

Contribution à la modélisation diphasique du transport sédimentaire en milieux côtiers et estuariens

Abstract : This thesis represents a contribution to physical and numerical modelling for sediment transport in estuarine and coastal zones. The developed two-phase flow approach differs from the classical one by resolving the mass and momentum equations and the transport equation for turbulent kinetic energy, separately for each phase. Transfer terms of momentum and turbulent kinetic energy between phase takes into account fluid-particle interactions. The work presented in this thesis mainly involves turbulence modelling in particulate two-phase flows.

Concerning the results, we show that the developed approach can reproduce quantitatively the mains processes involved in sediment transport of non-cohesive particles: sedimentation and dispersion effects of particles by the turbulent fluid motion in dilute suspension. Especially, the proposed model confirms the existence of a horizontal velocity lag between the fluid and the particles. It simulates the turbulent dispersion effect of particles and the damping of fluid turbulence due to the particle's presence. Another originality of this work is to present a turbulent two-phase free-surface flow model, 2D vertical, for sediment transport simulation. Moreover, we identify the gaps between theories and experiments on dense, turbulent two-phase flow. We propose solutions for the simulation of cohesive material behaviour. An attempt to numerical simulation of turbidity maximums in the Seine estuary is presented. The model has qualitatively reproduced the turbidity maximum without imposing any erosion or deposition laws.
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https://tel.archives-ouvertes.fr/tel-00173387
Contributor : Julien Chauchat <>
Submitted on : Wednesday, September 19, 2007 - 4:45:58 PM
Last modification on : Monday, April 27, 2020 - 4:26:29 PM
Long-term archiving on: : Thursday, April 8, 2010 - 8:50:03 PM

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  • HAL Id : tel-00173387, version 1

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J. Chauchat. Contribution à la modélisation diphasique du transport sédimentaire en milieux côtiers et estuariens. Sciences de la Terre. Université de Caen, 2007. Français. ⟨tel-00173387⟩

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