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Why don't avalanche-dynamics models of higher complexity necessarily lead to better predictions?
Publications associées (50)
Geometric Model Order Reduction
During the past decade, model order reduction (MOR) has been successfully applied to reduce the computational complexity of elliptic and parabolic systems of partial differential equations (PDEs). However, MOR of hyperbolic equations remains a challenge. S ...
EPFL2018A semi-infinite hydraulic fracture driven by a shear-thinning fluid
Brice Tanguy Alphonse Lecampion, Fatima-Ezzahra Moukhtari
We use the Carreau rheological model which properly accounts for the shear-thinning behaviour between the low and high shear rate Newtonian limits to investigate the problem of a semi-infinite hydraulic fracture propagating at a constant velocity in an imp ...
Cambridge University Press2018Propagation of a Radial Fluid-driven Fracture in Nonlinear Solid --around the tip of a fluid-driven fracture: process zone vs deviated fluid flow
Brice Tanguy Alphonse Lecampion, Dong Liu
Deviations from conventional hydraulic fracturing simulators’ predictions are sometimes observed in the field and laboratory. This questions the basic assumptions adopted in linear hydraulic fracture mechanics (LHFM): a linear elastic solid and a simplifie ...
2018Numerical Modelling of Two-Phase Flow with Moving Boundary Fitted Meshes
In this thesis, a computational approach is used to study two-phase flow including phase change by direct numerical simulation.
This approach follows the interface with an adaptive moving mesh.
The incompressible Navier-Stokes equations are solved, in tw ...
EPFL2018The subtle mechanics of an avalanche – as seen in 3D
Drawing on the fact that the snow in an avalanche can behave like both a solid and a fluid, a young researcher at EPFL and WSL Institute for Snow and Avalanche Research SLF has managed to simulate a snow slab avalanche with unrivaled precision. ...
2018The dam-break problem for eroding viscoplastic fluids.
Christophe Ancey, Belinda Margaret Bates
Natural gravity-driven flows can increase in volume by eroding the bed on which they descend. This process is called basal entrainment and is thought to play a key role in the bulk dynamics of geophysical flows. Although its study is difficult using field ...
Elsevier2017Stokes' third problem for Herschel-Bulkley fluids.
Christophe Ancey, Belinda Margaret Bates
Herschel-Bulkley materials can be set in motion when a sufficiently high shear stress or body force is applied to them. We investigate the behaviour of a layer of Herschel-Bulkley fluid when it is suddenly tilted and subject to gravitational forces. The ma ...
Elsevier2017Scaling description of non-local rheology
The plastic flow of amorphous materials displays non-local effects, characterized by a cooperativity length scale xi. We argue that these effects enter in the more general description of surface phenomena near critical points. Using this approach, we obtai ...
Royal Society of Chemistry2017FaCSI: A block parallel preconditioner for fluid-structure interaction in hemodynamics
Alfio Quarteroni, Simone Deparis, Davide Forti, Gwenol Grandperrin
Modeling Fluid-Structure Interaction (FSI) in the vascular system is mandatory to reliably compute mechanical indicators in vessels undergoing large deformations. In order to cope with the computational complexity of the coupled 3D FSI problem after discre ...
Academic Press Inc Elsevier Science2016A numerical study of the blood flow through the aortic valve: comparison of Newtonian and non-Newtonian models
Being able to accurately reproduce the physiological phenomena which take place in blood vessels requires understanding the impact physical parameters have on the fluid’s flow. Modeling blood flow implies choosing, or defining, at least one model with the ...
2016