A three‐dimensional control volume finite element method is developed for NAPL groundwater contamination problems. Tetrahedral elements are formed by decomposing deformed blocks. The decomposition is carried out in such a way as to minimize the size of the negative transmissibilities. Negative transmissibilities produce non‐physical discrete fluid flow paths and can cause oscillatory behaviour in the Newton iteration. Example results are presented for a three‐dimensional NAPL contamination scenario using typical geophysical data.
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Letniowski et al. (1991) studied this question.
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