DIFMIG - A computer program for calculation of diffusive migration through multi-barrier systems

P. Bo, Lars Carlsen

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    Abstract

    The FORTRAN IV program DIFMIG calculates one-dimensionally (i.e. column) the diffusive migration of single substances through arbitrary multi-barrier systems according to the diffusion equation

    ∂C/∂+ = D'(t)∂2C/∂x2 + F'(C,t)

    where D'(t) is the effective dispersion coefficient and F'(C,t) is a function responsible for time dependent changes in concentration other than dispersion/diffusion (e.g. slow dissolution of a compound from a repository, radioactive decay, and/or build up of daughter products. The method takes possible time dependent variations in the effective dispersion into account.

    The diffusion equation is solved by a finite difference implicite method, the resulting trigonal matrix equation being solved by standard methods.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages32
    ISBN (Print)87-550-0810-0
    Publication statusPublished - 1981
    SeriesRisø-M
    Number2262
    ISSN0418-6435

    Keywords

    • Risø-M-2262
    • D codes
    • Diffusion lenght
    • Finite difference method
    • Migration length
    • One-dimensional calculations
    • Radionuclide migration

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