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Discretization problems in the simulation of radionuclide transfer in geologic media


, : Discretization problems in the simulation of radionuclide transfer in geologic media. Pages 369-380 1986

The modeling of flow and mass transport in geologic material in relationship with nuclear waste disposal problems makes use of numerical techniques which must be analyzed beforehand from the viewpoint of accuracy and performance. An important work of assessment of this kind was performed during the Intracoin exercise and is currently done in Hydrocoin. We find that an even more severe testing of the numerical codes is done when trying to model an actual situation. In this short contribution we want to point out some of the practical problems encountered while working on real field data, some of the solutions envisioned and some of the yet unsolved problems. All of these problems have to do with time or space discretization in very heterogeneous media or for phenomena with highly different kinetics. Our presentation will be mostly related to finite element techniques, as they constitute our personal experience, but we believe that the problems posed are relevant for most approaches.--Modified report abstract.

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