Article (Scientific journals)
Numerical modelling of backward front propagation in piping erosion by DEM-LBM coupling
Tran, Duc Kien; Prime, Noemie; Froiio, Francesco et al.
2016In European Journal of Environmental and Civil Engineering
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Keywords :
backward erosion; piping erosion; discrete element method; lattice Boltzmann method
Abstract :
[en] A granular soil REV located on the upstream side of the erosion pipe front is modelled numerically, at the grain scale, by coupling the Discrete Element Method (DEM) with the Lattice Boltzmann Method (LBM) for the representation of the solid and fluid phases, respectively. The implementation of DEM follows a standard molecular dynamics approach and the interactions between grains are regulated by unilateral contacts and breakable bonds. A synopsis of the LBM scheme is provided, with focus on the implementation of non-slip conditions for moving boundaries and use of the Multiple Relaxation Time approach for improved numerical stability. The coupling scheme is described along with the criteria for setting the numerical parameters of the two methods. After a “dry” preparation procedure, the numerical REV is tested under fully saturated conditions and increasing pressure difference. Backward erosion is observed and a micromechanical inspection of the granular phase suggests that arching through force chains and the breakage of tensile bonds are prominent resistance and degradation mechanisms, respectively.
Disciplines :
Civil engineering
Author, co-author :
Tran, Duc Kien ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Prime, Noemie
Froiio, Francesco
Callari, Carlo
Vincens, Eric
Language :
English
Title :
Numerical modelling of backward front propagation in piping erosion by DEM-LBM coupling
Publication date :
December 2016
Journal title :
European Journal of Environmental and Civil Engineering
ISSN :
1964-8189
eISSN :
2116-7214
Publisher :
Taylor & Francis, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 19 March 2019

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