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Data for 'Fluid flow in porous media using image based modelling to parametrise Richards' equation'

Data for 'Fluid flow in porous media using image based modelling to parametrise Richards' equation'
Data for 'Fluid flow in porous media using image based modelling to parametrise Richards' equation'
Assigned DOI: 10.5258/SOTON/405744The parameters in Richards' equation are usually calculated from experimentally measured values of the soil water characteristic curve and saturated hydraulic conductivity. The complex pore structures that often occur in porous media complicate such parametrisation due to hysteresis between wetting and drying and the effects of tortuosity. Rather than estimate the parameters in Richards' equation from these indirect measurements, image based modelling is used to investigate the relationship between the pore structure and the parameters. A three dimensional, X-ray computed tomography image stack of a soil sample with voxel resolution of 5 ?m has been used to create a computational mesh. The Cahn-Hilliard-Stokes equations for two fluid flow, in this case water and air, were applied to this mesh and solved using the finite element method in COMSOL Multiphysics. The upscaled parameters in Richards' equation are then obtained via homogenisation. The effect on the soil-water retention curve due to three different contact angles, 0°, 20° and 60° was also investigated. The results show that the pore structure affects the properties of the flow on the large scale and different contact angles can change the parameters for Richards' equation.Image based model created using ScanIP and COMSOL Multiphysics of fluid movement in soil.
Image based modelling, porous media, Richards' equation
University of Southampton
Baxter, Laura
b8f4b942-cb87-4386-ab29-17bdd0f53ec1
Daly, K.R.
e28b1acf-cdde-4b52-8d83-cf314d7c3466
Naveed, Muhammad
ffa04925-7d0a-42fa-b95b-548fe3e4e2db
Koebernick, Nicolai
118c4e45-02d8-42da-84c8-8ee4fac140ad
Hallett, Paul D.
2e6a4596-83d9-4aeb-bb84-025c3660a536
Bengough, Anthony G.
ac1f754e-002c-44f6-8907-8771a4cd1fd3
George, TImothy S.
6b957175-f0b0-4456-87e3-241040c31cf8
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Baxter, Laura
b8f4b942-cb87-4386-ab29-17bdd0f53ec1
Daly, K.R.
e28b1acf-cdde-4b52-8d83-cf314d7c3466
Naveed, Muhammad
ffa04925-7d0a-42fa-b95b-548fe3e4e2db
Koebernick, Nicolai
118c4e45-02d8-42da-84c8-8ee4fac140ad
Hallett, Paul D.
2e6a4596-83d9-4aeb-bb84-025c3660a536
Bengough, Anthony G.
ac1f754e-002c-44f6-8907-8771a4cd1fd3
George, TImothy S.
6b957175-f0b0-4456-87e3-241040c31cf8
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe

Baxter, Laura, Daly, K.R., Naveed, Muhammad, Koebernick, Nicolai, Hallett, Paul D., Bengough, Anthony G., George, TImothy S., Sinclair, Ian and Roose, Tiina (2017) Data for 'Fluid flow in porous media using image based modelling to parametrise Richards' equation'. University of Southampton [Dataset]

Record type: Dataset

Abstract

Assigned DOI: 10.5258/SOTON/405744The parameters in Richards' equation are usually calculated from experimentally measured values of the soil water characteristic curve and saturated hydraulic conductivity. The complex pore structures that often occur in porous media complicate such parametrisation due to hysteresis between wetting and drying and the effects of tortuosity. Rather than estimate the parameters in Richards' equation from these indirect measurements, image based modelling is used to investigate the relationship between the pore structure and the parameters. A three dimensional, X-ray computed tomography image stack of a soil sample with voxel resolution of 5 ?m has been used to create a computational mesh. The Cahn-Hilliard-Stokes equations for two fluid flow, in this case water and air, were applied to this mesh and solved using the finite element method in COMSOL Multiphysics. The upscaled parameters in Richards' equation are then obtained via homogenisation. The effect on the soil-water retention curve due to three different contact angles, 0°, 20° and 60° was also investigated. The results show that the pore structure affects the properties of the flow on the large scale and different contact angles can change the parameters for Richards' equation.Image based model created using ScanIP and COMSOL Multiphysics of fluid movement in soil.

Other
TC40_CA20F_sat50_mu_xa.mph - Dataset
Available under License Creative Commons Attribution.
Download (457MB)
Text
DataSet_ImageBasedRichards_ReadMe.txt - Dataset
Available under License Creative Commons Attribution.
Download (1kB)
Other
ImageBasedRichardsResults.mat - Dataset
Available under License Creative Commons Attribution.
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More information

Published date: 2017
Keywords: Image based modelling, porous media, Richards' equation
Organisations: Faculty of Engineering and the Environment, Bioengineering Group, Engineering Mats & Surface Engineerg Gp, Southampton Marine & Maritime Institute

Identifiers

Local EPrints ID: 405744
URI: https://eprints.soton.ac.uk/id/eprint/405744
PURE UUID: 0f17cbe4-73ab-4e4a-bc3f-312aefe99895
ORCID for Laura Baxter: ORCID iD orcid.org/0000-0003-0198-7591
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063

Catalogue record

Date deposited: 10 Feb 2017 10:01
Last modified: 06 Jun 2018 12:36

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Contributors

Creator: Laura Baxter ORCID iD
Creator: K.R. Daly
Creator: Muhammad Naveed
Creator: Nicolai Koebernick
Creator: Paul D. Hallett
Creator: Anthony G. Bengough
Creator: TImothy S. George
Creator: Ian Sinclair
Creator: Tiina Roose ORCID iD

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