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Synchrotron X-ray microtomography and lattice Boltzmann simulations of gas flow through volcanic pumices

Publications associées (32)

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Permeability of deformable soft aggregated earth materials: From single pore to sample cross section

Dani Or

[1] Fluid flow in deformable porous media is of interest in many areas of hydrology, geophysics, and environmental engineering at scales ranging from individual pore to field scale. With increasing interest in pore-scale hydraulics, there is also the need ...

American Geophysical Union2007

A simulator for adaptive parallel applications

Roger Hersch, Sebastian Gerlach

Dynamically allocating computing nodes to parallel applications is a promising technique for improving the utilization of cluster resources. Detailed simulations can help identify allocation strategies and problem decomposition parameters that increase the ...

2007

TOMCAT: A beamline for TOmographic Microscopy and Coherent rAdiology experimenTs

Simon Nessim Henein, Amela Groso, Marco Stampanoni

Synchrotron‐based X‐ray Tomographic Microscopy (SRXTM) is nowadays a powerful technique for non‐destructive, high‐resolution investigations of a broad kind of materials. High‐brilliance and high‐coherence third generation synchrotron radiation facilities a ...

2007

Can a Helmholtz solver run on a cluster?

Marc Anthony David Habisreutinger, Emmanuel Leriche, Vincent Keller

Our vectorized Helmholtz solver runs at 85% efficiency on a NEC SX-5. The most time-consuming parts have been ported on SMP, NUMA, and cluster architectures. It is shown that an OpenMP version can deliver similar performance when running it on a 16 process ...

IEEE2006

Deformation and permeability of aggregated soft earth materials

Dani Or

[ 1] This study develops a framework for modeling deformation of individual pores in elastoviscoplastic earth material accounting for the effects of evolving pore size and shape on material hydraulic permeability. We describe the velocity field of a fluid ...

2006

OnCall: defeating spikes with a free-market application cluster

George Candea

Even with reasonable overprovisioning, today's Internet application clusters are unable to handle major traffic spikes and flash crowds. As an alternative to fixed-size, dedicated clusters, we propose a dynamically-shared application cluster model based on ...

2004

Parallelization and scheduling of data intensive particle physics analysis jobs on clusters of PCs

Roger Hersch, Sébastien Ponce

Scheduling policies are proposed for parallelizing data intensive particle physics analysis applications on computer clusters. Particle physics analysis jobs require the analysis of tens of thousands of particle collision events, each event requiring typic ...

IEEE Computer Society, Los Alamitos;Massey University, Palmerston, CA 90720-1314, United States;New Zealand2004

Synchrotron radiation in radiology: novel X-ray sources

Giorgio Margaritondo, Reto Meuli

X-rays, the key ingredient of radiology, are still primarily produced with the mechanism discovered by Rontgen over one century ago. A different approach, however, is becoming increasingly important: the use of synchrotron sources based on fast-moving elec ...

Springer-Verlag2003

Centrifuge modelling of solute transport during partially saturated flow

David Andrew Barry

The concept of “mobile” and “immobile” fluid regions (as incorporated in the Two-Region Model, TRM) is often used in the governing equation to model tailing in solute breakthrough curves (BTC). In this paper, we apply the TRM and its parent equation, the A ...

1999

High-performance parallel computing for incompressible flow simulations

Mark Sawley, Michel Deville

High-performance parallel computer systems have been employed to compute a variety of three-dimensional incompressible fluid flows. Three different numerical methods have been used for the discretization of the Navier-Stokes equations, with domain decompos ...

1999