Modeling mass transfer in fracture flows with the time domain-random walk method

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http://hdl.handle.net/10138/308622

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Kuva , J , Voutilainen , M & Mattila , K 2019 , ' Modeling mass transfer in fracture flows with the time domain-random walk method ' , Computational Geosciences , vol. 23 , no. 5 , pp. 953-967 . https://doi.org/10.1007/s10596-019-09852-5

Titel: Modeling mass transfer in fracture flows with the time domain-random walk method
Författare: Kuva, J.; Voutilainen, M.; Mattila, K.
Upphovmannens organisation: Geological disposal of spent nuclear fuel
Department
Datum: 2019-10
Språk: eng
Sidantal: 15
Tillhör serie: Computational Geosciences
ISSN: 1573-1499
DOI: https://doi.org/10.1007/s10596-019-09852-5
Permanenta länken (URI): http://hdl.handle.net/10138/308622
Abstrakt: The time domain-random walk method was developed further for simulating mass transfer in fracture flows together with matrix diffusion in surrounding porous media. Specifically, a time domain-random walk scheme was developed for numerically approximating solutions of the advection-diffusion equation when the diffusion coefficient exhibits significant spatial variation or even discontinuities. The proposed scheme relies on second-order accurate, central-difference approximations of the advective and diffusive fluxes. The scheme was verified by comparing simulated results against analytical solutions in flow configurations involving a rectangular channel connected on one side with a porous matrix. Simulations with several flow rates, diffusion coefficients, and matrix porosities indicate good agreement between the numerical approximations and analytical solutions.
Subject: Advection
Breakthrough curve
DIFFUSION
HETEROGENEOUS ROCK MATRIX
HYDRODYNAMIC TRANSPORT
Matrix diffusion
PERMEABILITY
PORE
POROSITY
POROUS-MEDIA
Porous media
SIMULATION
Simulation
Solute transport
116 Chemical sciences
1171 Geosciences
Referentgranskad: Ja
Licens: cc_by
Användningsbegränsning: openAccess
Parallelpublicerad version: publishedVersion


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