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Applied Mechanics

Getting to grips with particles!

In order to be capable of modeling the overall behavior of fluid/particle flows on a macro scale, IFPEN has been developing massively parallel 3D computational codes to directly simulate this micro scale and to precisely determine the interactions between the particles and the suspending fluid.

From the transport of sand in production pipelines to fluidized beds in catalytic reactors, fluid/particle flows are present in a large number of applications studied by IFPEN. Their scientific, industrial and economic importance means that understanding them is essential.

It is difficult to study them due to the broad range of scale in these flows, from a grain of sand to a pipeline that runs several hundred kilometers, or from a fine particle of catalyst to a fluidized-bed catalytic cracker of several meters. It is therefore crucial to precisely determine the interactions between the particles and the suspending fluid on a micro scale in order to be capable of satisfactorily modeling the overall behavior on a macro scale.

For the last few years, IFPEN has been developing massively parallel 3 D computational codes to directly simulate this micro scale: GRAINS3D for inter- particle collisions and PeliGRIFF for hydrodynamic coupling. Used on powerful supercomputers, these codes enable modeling of up to 100,000 particles coupled with a fluid and several million in a dry granular flow.

The development of PeliGRIFF is thus consistent with a multi-scale simulation approach. The next studies will focus on methods to integrate the results from the micro to the macro scale, in a kind of upward cascade of knowledge.


 Re-suspension of 500 spherical catalysts by natural convection: temperature evolution over time.

 

Scientific contact: guillaume.vinay@ifpen.fr

Published in Issue 7 of the Newsletter Science@ifpen -  May 2011

Publications

  • A. Wachs, A DEM-DLM/FD method for direct numerical simulation of particulate flows: Sedimentation of polygonal isometric particles in a Newtonian fluid with collisions. Computers & Fluids, 38(8), 1608–1628, 2009.
     >> DOI:10.1016/j.compfluid.2009.01.005
  • G. Vinay, A. Wachs, V. Hergault, DNS of particulate flows with collisions using a parallel DEM-DLM/FD method: PelIGRIFF, Vth European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010, Lisbon, Portugal.

See also
 + www.peligriff.com

 


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