Publications by Steve Cochard | EPFL Graph Search

Experimental investigation of the spreading of viscoplastic fluids on inclined planes

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

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

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

Measurements of time-dependent free-surface viscoplastic flows down steep slopes

Steve Cochard

The objective of this thesis was to increase our understanding of gravity-driven geophysical flows by developing a new platform to simulate avalanches of fluid in the laboratory. To simulate flow avalanches in the laboratory, we created a unique experiment ...

EPFL2007

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

Steve Cochard, Christophe Ancey

Taylor & Francis2006

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

Steve Cochard, Sébastien Wiederseiner, Christophe Ancey, Martin Rentschler

2006

Accurate measurements of free-surface in the dam-break problem

Steve Cochard, Christophe Ancey

Taylor & Francis2006

Understanding avalanches

Steve Cochard, Christophe Ancey

Institute of Physics2006

Accurate measurements of free-surface in the dam-break problem

Steve Cochard, Christophe Ancey

2006

Front dynamics of supercritical non-Boussinesq gravity currents

Steve Cochard, Sébastien Wiederseiner, Christophe Ancey, Martin Rentschler

In this paper, we seek similarity solutions to the shallow water (Saint-Venant) equations for describing the motion of a non-Boussinesq, gravity-driven current in an inertial regime. The current is supplied in fluid by a source placed at the inlet of a hor ...

American Geophysical Union2006

Rhéophysique des suspensions concentres

Steve Cochard, Christophe Ancey

2005