NAPL Simulator

Version 1.0 - October 1997

NAPL Simulator conducts a simulation of the contamination of soils and aquifers which results from the release of organic liquids commonly referred to as Non-Aqueous Phase Liquids (NAPLS)

The simulator is applicable to three interrelated zones: a vadose zone which is in contact with the atmosphere, a capillary zone, and a water-table aquifer zone. Three mobile phases are accommodated: water, NAPL, and gas. The 3-phase k-S-P sub-model accommodates capillary and fluid entrapment hysteresis. NAPL dissolution and volatilization are accounted for through rate-limited mass transfer sub-models.

The numerical solution is based on a Hermite collocation finite element discretization. The simulator provides an accurate solution of a coupled set of non-linear partial differential equations that are generated by combining fundamental balance equations with constitutive thermodynamic relationships.

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Developer: EPA