Abstract
Two numerical methods are developed for transient saturated-unsaturated two-dimensional ground-water flow. One formulation uses the usual single-phase formulation with a passive air phase at constant pressure. The second model uses a full two-phase air-water formulation. The numerical results for both formulations are compared on some test problems. In some cases, the single-phase formulation and the two-phase formulations give greatly different results. This can be explained in terms of the fractional flow curve for the air-water system. The single-phase technique generally requires less computational work than the two-phase formulation, although there are some situations where the numerical performance of the single-phase formulation is very poor.
Published Version
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