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NAPL Simulator

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NAPL Simulator conducts a simulation of the contamination of soils and aquifers that results from the release of organic liquids commonly referred to as nonaqueous-phase liquids (NAPLS). The simulator is applicable to three interrelated zones: a vadose zone that 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 three-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.

This model is available in both two-dimensional and three-dimensional version.


Version 2.0
Release Date November 2010
Development Status general release
Development Information  
Operating System DOS
Development Language  
Intended Audience  
Key Words  
Related Web Sites  


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US EPA. (1997) "NAPL: Simulator Documentation." Publication NO. EPA/600/R-97/102. | Revisions (ZIP) (10.8 MB)

1D Files

1-D DOS tutorial (ZIP) (884 KB)

2D Files

2-D DOS source code (ZIP) (340 KB)

2-D DOS example files 1 (ZIP) (216 KB)

2-D DOS example files 2 (ZIP) (236 KB)

2-D DOS example files 3 (ZIP) (220 KB)

2-D DOS example files 4 (ZIP) (264 KB)

2-D DOS example files 5 (ZIP) (284 KB)

2-D DOS example files 6 (ZIP) (440 KB)

2-D DOS example files 7 (ZIP) (292 KB)

3D Files

3-D DOS source code (ZIP) (376 KB)

3-D DOS example files (ZIP) (300 KB)

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