Modification of the finite element heat and mass transfer code (FEHMN) to model multicomponent reactive transport

Viswanathan, Hari

doi:10.2172/541823

Cited by 4 publications

(2 citation statements)

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“…This allows the user, on the basis of information about the reactive transport system, to couple only those components that are required for et%cient solution of the system of equations. Selective Coupling of components linked to each other through kinetic chemical reactions allows a given problem to be solved in the fastest, yet most memory efficient, manner possible (Viswanathan, 1996).…”

Section: Iv~(2-26)mentioning

confidence: 99%

The Development and Application of Reactive Transport Modeling Techniques to Study Radionuclide Migration at Yucca Mountain, NV

Viswanathan¹

1999

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Section: Iv~(2-26)mentioning

confidence: 99%

The Development and Application of Reactive Transport Modeling Techniques to Study Radionuclide Migration at Yucca Mountain, NV

Viswanathan¹

1999

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“…This allows the user, on the basis of information of the reactive transport system, to couple only those components that are required for ecient solution of the system of equations. Selective Coupling of components linked to each other through kinetic chemical reactions allows a given problem to be solved in the fastest, yet most memory ecient, manner possible [24].…”

mentioning

confidence: 99%

Efficient numerical techniques for modeling multicomponent ground-water transport based upon simultaneous solution of strongly coupled subsets of chemical components

Robinson

Viswanathan

Valocchi

2000

Advances in Water Resources

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An iterative solution technique for reactive transport problems is developed, which we call the selective coupling method, that represents a versatile alternative to traditional uncoupled iterative techniques and the fully coupled global implicit method. The chemical formulation studied allows a combination of equilibrium and kinetic reactions, and therefore is a more versatile model formulation than a purely equilibrium-based system. However, this is a very challenging system for obtaining an ecient numerical solution. Techniques that sequentially compute the concentrations of aqueous components possibly ignore important derivatives in the Jacobian matrix of the full system of equations. The selective coupling method developed here allows only the strongly coupled components to be solved together, and the transport iteration consists of solving groups of components simultaneously. We also develop a method denoted as coupled normalization to reduce the computational work and memory requirements for particular types of reactive transport problems. These approaches can result in computational savings relative to the global implicit method by achieving a similar iteration count while reducing the cpu time per iteration. More importantly, the memory requirements of the selective coupling technique are controlled by the maximum number of coupled components, rather than by the total number of components. For complex aqueous chemical systems and grids with a large number of nodes, memory eciency is the characteristic that makes the selective coupling method particularly attractive relative to the global implicit method. A series of example cases illustrate the eciency of the new approach. These test problems are also used to address the implementation issues surrounding the most ecient strategy for coupling the aqueous components when carrying out the chemical transport iteration. In-depth knowledge of the behavior of the chemical system is required to select an appropriate solution strategy. Published by Elsevier Science Ltd.

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A reactive transport model of neptunium migration from the potential repository at Yucca Mountain

Viswanathan

Robinson

Valocchi

et al. 1998

Journal of Hydrology

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Modification of the finite element heat and mass transfer code (FEHMN) to model multicomponent reactive transport

Cited by 4 publications

References 24 publications

The Development and Application of Reactive Transport Modeling Techniques to Study Radionuclide Migration at Yucca Mountain, NV

The Development and Application of Reactive Transport Modeling Techniques to Study Radionuclide Migration at Yucca Mountain, NV

Efficient numerical techniques for modeling multicomponent ground-water transport based upon simultaneous solution of strongly coupled subsets of chemical components

A reactive transport model of neptunium migration from the potential repository at Yucca Mountain

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