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Multiscale modelling of hydraulic conductivity in vuggy porous media

Multiscale modelling of hydraulic conductivity in vuggy porous media
Multiscale modelling of hydraulic conductivity in vuggy porous media
Flow in both saturated and non-saturated vuggy porous media, i.e., soil, is inherently multiscale. The complex microporous structure of the soil aggregates and the wider vugs provides a multitude of flow pathways and has received significant attention from the X-ray CT community with a constant drive to image at higher resolution. Using multiscale homogenization we derive averaged equations to study the effects of the microscale structure on the macroscopic flow. The averaged model captures the underlying geometry through a series of cell problems and is verified through direct comparison to numerical simulations of the full structure. These methods offer significant reductions in computation time and allow us to perform 3D calculations with complex geometries on a desktop PC. The results show that the surface roughness of the aggregate has a significantly greater effect on the flow than the microstructure within the aggregate. Hence, this is the region in which the resolution of X-ray CT for image based modelling has the greatest impact.
multiscale modelling, image based modelling, x-ray ct, soil water flow
1364-5021
1-22
Daly, Keith R.
64f85c2e-2562-44df-9cb8-1be7fbc7e74c
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Daly, Keith R.
64f85c2e-2562-44df-9cb8-1be7fbc7e74c
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe

Daly, Keith R. and Roose, Tiina (2014) Multiscale modelling of hydraulic conductivity in vuggy porous media. Proceedings of the Royal Society A, 470 (2162), 1-22. (doi:10.1098/rspa.2013.0383).

Record type: Article

Abstract

Flow in both saturated and non-saturated vuggy porous media, i.e., soil, is inherently multiscale. The complex microporous structure of the soil aggregates and the wider vugs provides a multitude of flow pathways and has received significant attention from the X-ray CT community with a constant drive to image at higher resolution. Using multiscale homogenization we derive averaged equations to study the effects of the microscale structure on the macroscopic flow. The averaged model captures the underlying geometry through a series of cell problems and is verified through direct comparison to numerical simulations of the full structure. These methods offer significant reductions in computation time and allow us to perform 3D calculations with complex geometries on a desktop PC. The results show that the surface roughness of the aggregate has a significantly greater effect on the flow than the microstructure within the aggregate. Hence, this is the region in which the resolution of X-ray CT for image based modelling has the greatest impact.

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Daly-Roose 2013 prsa_accepted.pdf - Author's Original
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More information

e-pub ahead of print date: 11 December 2013
Published date: February 2014
Keywords: multiscale modelling, image based modelling, x-ray ct, soil water flow
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 359771
URI: http://eprints.soton.ac.uk/id/eprint/359771
ISSN: 1364-5021
PURE UUID: ed55cbe1-6933-44cd-ab29-80d07e122807
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063

Catalogue record

Date deposited: 12 Nov 2013 11:59
Last modified: 20 Jul 2019 00:49

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