Numerical rheometry of bulk materials using a power law fluid and the lattice Boltzmann method

Leonardi, C. R., Owen, D. R. J. and Feng, Y. T. (2011) Numerical rheometry of bulk materials using a power law fluid and the lattice Boltzmann method. Journal of Non-Newtonian Fluid Mechanics, 166 12-13: 628-638. doi:10.1016/j.jnnfm.2011.02.011


Author Leonardi, C. R.
Owen, D. R. J.
Feng, Y. T.
Title Numerical rheometry of bulk materials using a power law fluid and the lattice Boltzmann method
Journal name Journal of Non-Newtonian Fluid Mechanics   Check publisher's open access policy
ISSN 0377-0257
1873-2631
Publication date 2011-07-01
Sub-type Article (original research)
DOI 10.1016/j.jnnfm.2011.02.011
Volume 166
Issue 12-13
Start page 628
End page 638
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract In the present study, the flow of bulk materials is characterised as a non-Newtonian fluid and modelled using the lattice Boltzmann method. A power law and a Bingham model is implemented in the LBM, which is hydrodynamically coupled to the discrete element method (DEM) for structural interaction. The performance of both non-Newtonian models is assessed, both qualitatively and quantitatively, in benchmark problems. The validated, non-Newtonian LBM–DEM framework is then applied to the geometry of a cylindrical Couette rheometer to numerically determine the constitutive response of a sample of Leighton Buzzard sand. The numerical results, which employ the power law, are compared with experimental data, and a number of other synthetic soil samples are defined using the presented process of numerical rheometry. Finally, the numerical stress–strain rate response of the synthetic soil samples is interpreted within the context of a regularised Bingham model, and the similarities discussed.
Keyword Lattice Boltzmann method
Power law
Granular material
Cylindrical Couette rheometry
Bingham plastic
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Tue, 18 Jun 2013, 23:27:36 EST by Deanna Mahony on behalf of School of Mechanical and Mining Engineering