Modeling transport of water, ions, and chemical reactions in compacted bentonite: comparison among toughreact, numerrin, and comsol multiphysics

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The bentonite barrier is an essential part of a safe spent fuel repository in granitic bedrock. One of the most important safety functions of bentonite buffer is to limit groundwater flow so that all mass transport takes place by diffusion. In this work a new mathematical model was developed to define the transport of ions inside the bentonite, where there are bound interlayer water and free extra layer water and sorption capability. This model is tested in a specified geometry and calculated by two numerical platforms-Numerrin and COMSOL Multiphysics-and compared to the original TOUGHREACT model. The model comparison was not a straightforward task because of different approaches in the model setup. Therefore, all the equations are written down, and parameterization is done to create model descriptions near each other. The developed model adapts easily, and there are many new ideas to be tested in bridging the gap between performance assessment and real systems.
Original languageEnglish
Pages (from-to)169-174
JournalNuclear Technology
Volume187
Issue number2
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Bentonite
Chemical reactions
Ions
Water
Groundwater flow
Spent fuels
Parameterization
Sorption
Mass transfer
Mathematical models
Geometry

Keywords

  • cation exchange
  • modeling
  • transport

Cite this

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title = "Modeling transport of water, ions, and chemical reactions in compacted bentonite: comparison among toughreact, numerrin, and comsol multiphysics",
abstract = "The bentonite barrier is an essential part of a safe spent fuel repository in granitic bedrock. One of the most important safety functions of bentonite buffer is to limit groundwater flow so that all mass transport takes place by diffusion. In this work a new mathematical model was developed to define the transport of ions inside the bentonite, where there are bound interlayer water and free extra layer water and sorption capability. This model is tested in a specified geometry and calculated by two numerical platforms-Numerrin and COMSOL Multiphysics-and compared to the original TOUGHREACT model. The model comparison was not a straightforward task because of different approaches in the model setup. Therefore, all the equations are written down, and parameterization is done to create model descriptions near each other. The developed model adapts easily, and there are many new ideas to be tested in bridging the gap between performance assessment and real systems.",
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year = "2015",
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language = "English",
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pages = "169--174",
journal = "Nuclear Technology",
issn = "0029-5450",
publisher = "American Nuclear Society ANS",
number = "2",

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Modeling transport of water, ions, and chemical reactions in compacted bentonite: comparison among toughreact, numerrin, and comsol multiphysics. / Itälä, Aku; Laitinen, Mika; Tanhua-Tyrkkö, Merja; Olin, Markus.

In: Nuclear Technology, Vol. 187, No. 2, 2015, p. 169-174.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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AU - Itälä, Aku

AU - Laitinen, Mika

AU - Tanhua-Tyrkkö, Merja

AU - Olin, Markus

PY - 2015

Y1 - 2015

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AB - The bentonite barrier is an essential part of a safe spent fuel repository in granitic bedrock. One of the most important safety functions of bentonite buffer is to limit groundwater flow so that all mass transport takes place by diffusion. In this work a new mathematical model was developed to define the transport of ions inside the bentonite, where there are bound interlayer water and free extra layer water and sorption capability. This model is tested in a specified geometry and calculated by two numerical platforms-Numerrin and COMSOL Multiphysics-and compared to the original TOUGHREACT model. The model comparison was not a straightforward task because of different approaches in the model setup. Therefore, all the equations are written down, and parameterization is done to create model descriptions near each other. The developed model adapts easily, and there are many new ideas to be tested in bridging the gap between performance assessment and real systems.

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KW - transport

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