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Modeling solute transport and mixing in heterogeneous porous media under turbulent flow conditions
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Baioni, Elisa, Mousavi Nezhad, Mohaddeseh, Porta, Giovanni Michele and Guadagnini, Alberto (2021) Modeling solute transport and mixing in heterogeneous porous media under turbulent flow conditions. Physics of Fluids, 33 (10). 106604. doi:10.1063/5.0065734 ISSN 1070-6631.
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Official URL: https://doi.org/10.1063/5.0065734
Abstract
We develop and test a modeling approach to quantify turbulence-driven solute transport and mixing in porous media. Our approach addresses two key elements: (a) the spatial variability of the effective diffusion coefficient which is typically documented in the presence of a sediment–fluid interface and (b) the need to provide a model that can yield the complete distribution of the concentration probability density function, not being limited only to the mean concentration value and thus fully addressing solute mixing. Our work is motivated by the importance of solute transport processes in the hyporheic zone, which can have strong implications in natural attenuation of pollutants. Our approach combines Lagrangian schemes to address transport and mixing in the presence of spatial variability of effective diffusion. An exemplary scenario we consider targets a setup constituted by a homogeneous (fully saturated) porous medium underlying a clear water column where turbulent flow is generated. Solute concentration histories obtained through a model based solely on diffusive transport are benchmarked against an analytical solution. These are then compared against the results obtained by modeling the combined effects of diffusion and mixing. A rigorous sensitivity analysis is performed to evaluate the influence of model parameters on solute concentrations and mixing, the latter being quantified in terms of the scalar dissipation rate.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QA Mathematics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Library of Congress Subject Headings (LCSH): | Porous materials , Porous materials -- Fluid dynamics, Porous materials -- Transport properties, Sediment transport , Fluid mechanics -- Mathematical models | ||||||
| Journal or Publication Title: | Physics of Fluids | ||||||
| Publisher: | American Institute of Physics | ||||||
| ISSN: | 1070-6631 | ||||||
| Official Date: | 15 October 2021 | ||||||
| Dates: |
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| Volume: | 33 | ||||||
| Number: | 10 | ||||||
| Article Number: | 106604 | ||||||
| DOI: | 10.1063/5.0065734 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Reuse Statement (publisher, data, author rights): | This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Elisa Baioni, Mohaddeseh Mousavi Nezhad, Giovanni Michele Porta, and Alberto Guadagnini , "Modeling solute transport and mixing in heterogeneous porous media under turbulent flow conditions", Physics of Fluids 33, 106604 (2021) and may be found at https://doi.org/10.1063/5.0065734 | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 26 October 2021 | ||||||
| Date of first compliant Open Access: | 15 October 2022 |
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