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Model Report


Last Revision Date: 08/31/2009 View as PDF
General Information Back to Top
Model Abbreviated Name:

Model Extended Name:

Model Overview/Abstract:
Fully-transient, 3d, finite difference model which solves coupled equations to simulate the flow and transport of fluid in a porous or fractured geologic media.

Keywords: Flow and Transport Model, Contaminant Transport Model
Model Technical Contact Information:
Agency Contacts Susie McKenzie
EPA Region 6

Ken Johnson
EPA Region 6

U.S. EPA, Region 6 (6WQ-SG)

Model Homepage: http://www.geotransinc.com/swift.html Exiting the EPA Site
Substantive Changes from Prior Version: Older versions revised and updated for newer computing environments

User Information Back to Top
Technical Requirements
Computer Hardware
Varies with version of SWIFT – see recommendation from software supplier
Compatible Operating Systems
Varies with version of SWIFT – see recommendation from software supplier
Other Software Required to Run the Model
Varies with version of SWIFT – see recommendation from software supplier. Fortran compiler. Postprocessor – Surfer. Pre and Post Processor - Groundwater Vistas
Download Information
http://www.earthwardconsulting.com exit EPA

http://www.geotransinc.com/swift.htmlexit EPA

http://www.scientificsoftwaregroup.com exit EPA

Using the Model
Basic Model Inputs
Requires data for geologic media and fluids involved in simulation. See software supplier websites or user guide for further details.
Basic Model Outputs
Specified in model input file. See software supplier websites or user guide for further details.
User Support
User's Guide Available?
The model is approved by EPA for regulatory uses.

The user needs high level of technical education and modeling experience. This model requires knowledge of FORTRAN and the user must be comfortable working in a structured FORTRAN environment. The user must have experience in working with finite difference simulators and have experience with numerical techniques.

The documentation provides: (1) an abstract or abstract equivalent in the introduction, (2) schematic/diagram showing model structure and interaction of model components, (3) equations, equation solution methodologies, and related simplifying assumptions, (4) example input/output files, (5) input and output variable documentation including definitions, units, temporal/spatial dimensions, temporal/spatial resolution options, and (if applicable such as with FORTRAN) format, (6) guidance on selecting and/or estimating values and/or distributions for input variables (including guidance on calibration and selecting default values and/or distributions), (7) guidance on the analysis and interpretation of output, and (8) description of sensitivity analysis, uncertainty analysis, and testing (validation) methodologies and results. SWIFT for Windows version, see GeoTrans webite http://www.geotransinc.com/swift.html exit EPAfor pdf file of Users Guide and SWIFT Theory and Implementation Manuals

Other User Documents
SWIFT II Self Teaching Curriculum, see Earthward Consulting website http://www.earthwardconsulting.com/deep_well_reference.htm
User Qualifications
Working knowledge on use of SWIFT for application to modeling demonstrations relating to EPA no migration petitions

Model Science Back to Top
Problem Identification
SWIFT, developed by the Sandia National Laboratories, was sponsored by the Nuclear Regulatory Commission for its high-level nuclear-waste program. Some developers modified the capability of SWIFT for extended options, such as fractured media. Processes considered are fluid flow, heat transport, brine migration, and radionuclide-chain transport.
Summary of Model Structure and Methods
U.S. and S.I. units are both supported.

The model provides default values to assist the user when selecting some of the modeling parameters.

Governing equations are solved numerically.

Model Evaluation
Code verification has been performed.

Substantial model testing (evaluation) has been performed.

Model has been externally peer reviewed.

Case Studies
See technical references listed in the Users Guide, Theory and Implementation Manual and Self Teaching Curriculum for more information. Other evaluation: http://handle.dtic.mil/100.2/ADA294464

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