Fluidization of soil under increasing seepage flow: an energy perspective through CFD-DEM coupling

Nguyen, TT; Indraratna, B

Fluidization of soil under increasing seepage flow: an energy perspective through CFD-DEM coupling

Nguyen, TT Indraratna, B

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Publisher:: SPRINGER
Publication Type:: Journal Article
Citation:: Granular Matter, 2022, 24, (3)
Issue Date:: 2022-08-01

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Field	Value	Language
dc.contributor.author	Nguyen, TT
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-2346-8250
dc.date.accessioned	2023-04-11T03:00:08Z
dc.date.available	2023-04-11T03:00:08Z
dc.date.issued	2022-08-01
dc.identifier.citation	Granular Matter, 2022, 24, (3)
dc.identifier.issn	1434-5021
dc.identifier.issn	1434-7636
dc.identifier.uri	http://hdl.handle.net/10453/169518
dc.description.abstract	Increasing seepage flow causes soil particles to migrate, i.e., from local piping to complete fluidization, resulting in reduced effectives stress and degraded shear stiffness of the soil foundation. This process has received considerable attention in the past years, however, majority of them concentrate on macro-aspects such as the internal erosion and soil deformation, while there is a lack of fundamental studies addressing the energy transport at micro-scale of fluid-soil systems during soil approaching fluidization. In this regard, the current study presents an assessment of the energy evolution in soil fluidization based on the discrete element method (DEM) coupled with computation fluid dynamics (CFD). In this paper, an upward seepage flow of fluid is modelled by CFD based on the modified Navier–Stokes equations, while soil particles are governed by DEM with their mutual interactions being computed through fluid-particle force models. The energy transformation from the potential state to kinetic forms during fluid flowing is discussed with respect to numerical (CFD-DEM) results and the energy conservation concepts. The results show that majority of the potential energy induced by fluid flows has lost due to frictional mechanisms, while only a small amount of energy is needed to cause the soil to fluidize completely. The contribution of rotational and translational components to the total kinetic energy of particles, and their changing roles during soil fluidization is also presented. The effect of boundary condition on the energy transformation and fluidization of soil is also investigated and discussed. Graphical abstract: [Figure not available: see fulltext.]
dc.language	English
dc.publisher	SPRINGER
dc.relation	http://purl.org/au-research/grants/arc/LP160101254
dc.relation.ispartof	Granular Matter
dc.relation.isbasedon	10.1007/s10035-022-01242-6
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 0913 Mechanical Engineering
dc.subject.classification	Fluids & Plasmas
dc.title	Fluidization of soil under increasing seepage flow: an energy perspective through CFD-DEM coupling
dc.type	Journal Article
utslib.citation.volume	24
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access	*
dc.date.updated	2023-04-11T03:00:06Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	24
utslib.citation.issue	3

Abstract:

Increasing seepage flow causes soil particles to migrate, i.e., from local piping to complete fluidization, resulting in reduced effectives stress and degraded shear stiffness of the soil foundation. This process has received considerable attention in the past years, however, majority of them concentrate on macro-aspects such as the internal erosion and soil deformation, while there is a lack of fundamental studies addressing the energy transport at micro-scale of fluid-soil systems during soil approaching fluidization. In this regard, the current study presents an assessment of the energy evolution in soil fluidization based on the discrete element method (DEM) coupled with computation fluid dynamics (CFD). In this paper, an upward seepage flow of fluid is modelled by CFD based on the modified Navier–Stokes equations, while soil particles are governed by DEM with their mutual interactions being computed through fluid-particle force models. The energy transformation from the potential state to kinetic forms during fluid flowing is discussed with respect to numerical (CFD-DEM) results and the energy conservation concepts. The results show that majority of the potential energy induced by fluid flows has lost due to frictional mechanisms, while only a small amount of energy is needed to cause the soil to fluidize completely. The contribution of rotational and translational components to the total kinetic energy of particles, and their changing roles during soil fluidization is also presented. The effect of boundary condition on the energy transformation and fluidization of soil is also investigated and discussed. Graphical abstract: [Figure not available: see fulltext.]

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http://hdl.handle.net/10453/169518