We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Non-aqueous Phase Liquid (NAPL) Simulator

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.

Specifications
Version 2.0
Release Date November 2010
Operating System DOS

Downloads

US EPA. (1997) "NAPL: Simulator Documentation." Publication NO. EPA/600/R-97/102. Document Revisions (ZIP)(11 MB)

1-D File

NAPL 1-Dimensional DOS Tutorial (ZIP)(903 K)

2-D Files

NAPL 2-D DOS Source Code (ZIP)(345 K)

NAPL 2-D DOS Example Files 1 (ZIP)(221 K)

NAPL 2-D DOS Example Files 2 (ZIP)(239 K)

NAPL 2-D DOS Example Files 3 (ZIP)(224 K)

NAPL 2-D DOS Example Files 4 (ZIP)(269 K)

NAPL 2-D DOS Example Files 5 (ZIP)(289 K)

NAPL 2-D DOS Example Files 6 (ZIP) (447 K)

NAPL 2-D DOS Example Files 7 (ZIP)(296 K)

3-D Files

NAPL 3-D DOS Source Code (ZIP)(384 K)

NAPL 3-D DOS Example Files (ZIP)(305 K)