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Discrete Element Method and Computational Fluid Dynamics
DEM-CFD is my Ph.D's focus, below are the softwares I used:
The open source DEM code YADE-OpenDEM.
The open source DEM code ESyS-Particle-Win.
The open source CFD toolbox OpenFOAM.
PFC2D from Itasca.
A tutorial DEM program.
A most recent copy of my PhD thesis (include a couple of corrections) can be downloaded here (please only use the version in this site as reference):
Coupled Flow Discrete Element Method Application in Granular Porous Media using Coupled Open Source code.
download: pdf version
download: source code and example files.
For latest DEM-CFD coupling, please refer to ESyS-Foam for more details.
Classical sheet-pile flow net using coupled DEM-CFD (Lambe & Whitmann)
Flow net:
Contact force plot:
Particle liquefaction using coupled YADE-OpenFOAM
Click the link here files to download a demo:
Velocity distribution
Pressure distribution
Bubbling Bed using coupled YADE-OpenFOAM
Below are screenshots for a fluidized bed using coupled DEM-CFDsolution created by ParaView, the example used 2803 solid particles with a central injection superficial velocity u=2.6m/s
Click the link here 2dbed.avi to download a demo.
Initial mesh (0.15mx0.6m, nx=15, ny=30) and particle positions
Velocity distribution
Pressure distribution
DEM verification of two fundamental 1D soil mechanics problems
DEM solution is used in the verification of two fundamental 1D soil mechanics problems: upward seepage flow and consolidation.
Governing equation:
Initial and boundary conditions:
Comparison of DEM solution and analytical solutions for pressure distribution:
Pressure development for upward seepage flow
Pressure dissipation for consolidation
Tutorial DEM program
(These program provide very fundamental DEM functionality, only for educational purpose, they can help you understand DEM, but not for research. You can download source code here CylinderPorosityVC6.zip, you will need Visual C++ 6.0 or above with OpenGL to compile):
1. Two spherical particles collide in a cubic box:
The program can be downloaded here.
2. Two spherical particles collide in a cylinder:
The program can be downloaded here.
3. Compression of 484 particles in a cylinder.
The program can be downloaded here.
Coupled Particle-Flow Problem
The open source DEM code YADE and CFD (computational fluid dynamics) code OpenFOAM are linked to simulate the coupled particle-flow system. The averaged Navier-Stokes equation is used to model the fluid field and the standard DEM approach is used to model the solid particles.
Feng Chen, Eric. C. Drumm and Georges Guiochon and Kiichi Suzuki, Discrete Element Simulation of 1D Upward Seepage Flow with Particle-Fluid Interaction Using Coupled Open Source Software, 12th IACMAG Conference, India, October 1-6, 2008
Verification YADE, PFC2D and analytical solutions in 1D problem
We investigates a series of simple, one andtwo-particle contact problems. These problems, which employ various types ofdamping, are shown to be equivalent to classical one-dimensional vibrationproblems. The solutions are discussed in the context of theDEM, and results from the DEM are shown to comparevery well with the classical solutions.
Feng, Chen Eric. C. Drumm, and Georges Guiochon, Prediction/Verification of Particle Motion in One Dimension with the Discrete-Element Method, International Journal of Geomechanics, Volume 7, Issue 5 spp. 344-352
Simulation of Graded Rock Fill for Sinkhole Repair
You can download a demo of the YADE simulation here.
Feng Chen , Ozgur Alturk , Eric C. Drumm, Simulation of Graded Rock Fill for Sinkhole Repair in Particle Flow Model, Geoshanghai 2006 International conference, June 6-8, 2006
Chen Feng 2007 All rights reserved
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