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Christophe Ancey

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Related publications (96)

Stochastic modeling in sediment dynamics: Exner equation for planar bed incipient bed load transport conditions

Even under flow equilibrium conditions, river bed topography continuously evolves with time, producing trains of irregular bed forms. The idea has recently emerged that the variability in the bed form geometry results from some randomness in sediment flux. ...

American Geophysical Union2010

Image processing for the study of bedload transport of two-size spherical particles in a supercritical flow

Christophe Ancey

Bedload sediment transport of two-size coarse spherical particle mixtures in a turbulent supercritical flow was analyzed with image and particle tracking velocimetry algorithms in a two-dimensional flume. The image processing procedure is entirely presente ...

Springer Verlag2010

Improved SPH methods for simulating free surface flows of viscous fluids

Aurèle Parriaux, Jiannong Fang, Christophe Ancey, Martin Rentschler

2009

Rheophysics of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer

Sébastien Wiederseiner, Christophe Ancey

An optical visualization apparatus has been designed to measure the particle-velocity and solid-concentration profiles of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer. The main objective is to investigate the frictional-v ...

Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1 D, Melville, Ny 11747-4501 Usa2009

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

Steve Cochard, Christophe Ancey

We report experimental results related to the dam-break problem for viscoplastic fluids. Using image processing techniques, we were able to accurately reconstruct the free-surface evolution of fixed volumes of fluid suddenly released a plane. We used Carbo ...

Elsevier2009

The dam-break problem for Herschel-Bulkley viscoplastic fluids down steep flumes

Steve Cochard, Christophe Ancey

In this paper we investigate the dam-break problem for viscoplastic (Herschel- Bulkley) fluids down a sloping flume: a fixed volume of fluid initially contained in a reservoir is released onto a slope and flows driven by gravitational forces until these fo ...

2009

The dam-break problem for viscous fluids in the high-capillary-number limit

Steve Cochard, Nicolas Andreini, Christophe Ancey

Experiments were undertaken to investigate dam-break flows where a finite volume of highly viscous fluid (glucose with viscosity μ ≈ 350 Pa s) maintained behind a lock gate was released into a horizontal or inclined flume. The resulting sequence of flow-de ...

Cambridge University Press2009

Visco-plastic fluids: From Theory to Application

Christophe Ancey

2009

Segregation, recirculation and deposition of coarse particles near two-dimensional avalanche fronts

Christophe Ancey

Stratification patterns are formed when a bidisperse mixture of large rough grains and smaller more mobile particles is poured between parallel plates to form a heap. At low flow rates discrete avalanches flow down the free surface and are brought to rest ...

Cambridge University Press2009

Avalanches of concentrated granular suspensions down on inclined plane

Sébastien Wiederseiner, Nicolas Andreini, Christophe Ancey, Martin Rentschler

2008

Entrainment and motion of coarse particles in a shallow water stream down a steep slope

Anthony Christopher Davison, Christophe Ancey, Peter Frey

We investigate the entrainment, deposition and motion of coarse spherical particles within a turbulent shallow water stream down a steep slope. This is an idealization of bed-load transport in mountain streams. Earlier investigations have described this ki ...

Cambridge University Press2008

Tracking the free surface of time-dependent flows: Image processing for the dam-break problem

Steve Cochard, Christophe Ancey

The dam-break problem (i.e., the sudden release of a given volume of fluid down a slope) has attracted a great deal of attention from mechanicians and physicists over the past few years, with particular interest devoted to the free-surface profile and the ...

Springer Verlag2008

Rheophysical Investigation in Concentrated Particle Suspensions

Sébastien Wiederseiner, Nicolas Andreini, Christophe Ancey, Martin Rentschler

The Society of Rheology2008

An exact solution for ideal dam-break floods on steep slopes

Christophe Ancey, Martin Rentschler

Dam-break floods on steep slopes occur in diverse settings. They may result from failure of either natural or man-made dams, and they have been responsible for the loss of thousands of lives [Costa, 1988]. Recent disasters resulting from dam-break floods o ...

American Geophysical Union2008

Existence and features of similarity solutions for non-Boussinesq gravity currents

Steve Cochard, Sébastien Wiederseiner, Christophe Ancey, Martin Rentschler

In this paper, the flow dynamics of gravity currents on a horizontal plane is investigated from a theoretical point of view by seeking similarity solutions. The current is generated by unleashing a varying volume of heavy fluid within an ambient fluid of m ...

2007

Plasticity and geophysical flows: A review

Christophe Ancey

The objective of this review is to examine how the concept of plasticity is used in geophysical fluid dynamics. Rapid mass movements such as snow avalanches or debris flows involve slurries of solid particles (ice, boulder, clay, etc.) within an interstiti ...

2007

The Kulikovskiy-Sveshnikova-Beghin Model of Powder Snow Avalanches: Development and Application

Christophe Ancey

A simple theoretical model, the Kulikovskiy–Sveshnikova–Beghin (KSB) model, is outlined, describing the motion of a particle cloud moving down an incline. This model includes both the entrainment of surrounding ambient fluid and the entrainment of particle ...

2007

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Christophe Ancey

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Stochastic modeling in sediment dynamics: Exner equation for planar bed incipient bed load transport conditions

Image processing for the study of bedload transport of two-size spherical particles in a supercritical flow

Improved SPH methods for simulating free surface flows of viscous fluids

Rheophysics of highly concentrated coarse-particle suspensions in a wide-gap Couette rheometer

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

The dam-break problem for Herschel-Bulkley viscoplastic fluids down steep flumes

The dam-break problem for viscous fluids in the high-capillary-number limit

Visco-plastic fluids: From Theory to Application

Segregation, recirculation and deposition of coarse particles near two-dimensional avalanche fronts

Avalanches of concentrated granular suspensions down on inclined plane

Entrainment and motion of coarse particles in a shallow water stream down a steep slope

Tracking the free surface of time-dependent flows: Image processing for the dam-break problem

Rheophysical Investigation in Concentrated Particle Suspensions

An exact solution for ideal dam-break floods on steep slopes

Existence and features of similarity solutions for non-Boussinesq gravity currents

Plasticity and geophysical flows: A review

The Kulikovskiy-Sveshnikova-Beghin Model of Powder Snow Avalanches: Development and Application

Wide solid-discharge fluctuations and collective effects in bed-load transport

Front dynamics of a water surge at high Reynolds number: similarity solutions to the Saint-Venant equations

Front dynamics of a water surge at high Reynolds number: Similarity solutions to the Saint-Venant equations