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Swift for Windows®

  • Three-Dimensional Groundwater Flow and Transport Model
  • Equations for Pressure, Temperature, Brine, Radionuclides
  • Windows® Interface
  • Dual Porosity and Fractured Media

Overview

SWIFT for Windows is a fully transient, three-dimensional model which simulates the flow and transport of fluid, heat (energy), brine, and radionuclide chains in porous and fractured geologic media. The primary equations for fluid, heat, and brine are coupled with fluid density, fluid viscosity, and porosity. Steady-state options are available for the fluid and brine equations, and both Cartesian and cylindrical coordinate systems may be used. However, the latter system is restricted to two-dimensional, r-z simulations. Both dual-porosity and discrete-fracture conceptualizations may be considered for the fractured zone. Migration within the rock matrix is characterized as a one-dimensional process.

Features

Windows® Interface SWIFT for Windows is a 32-bit application intended for use on all currently supported Microsoft Windows desktop operating systems, with a Pentium or better processor. Running SWIFT for Windows is easy with the interface which prompts the user for the data set to simulate, tracks the progress of the simulation, and lists the output files created.



Postprocessor Interface (UNSWIFT) Contour maps of pressure, temperature, brine, or concentration in any window in any plane can be quickly processed directly into uniformly-spaced grid files for the Surfer® contouring software.

STLINE Particle Tracking Allows transient flowpath evaluation of streamlines and export to Surfer® as lines or posted symbols.

Windows Runtime Monitor The Windows Runtime Monitor displays essential simulation data while the simulation is running. The Windows Runtime Monitor tracks the simulation progress, highlighting the current program activity at the base of the screen. The time step, interval and other data are updated on the screen through the course of the simulation. Below the frame, system RAM requirements, matrix convergence (L2SOR only), creation of map file, and error messages are displayed. Auxiliary files for restart or binary input are also prompted.

Equations SWIFT for Windows is comprised of the four transport processes: fluid, heat, brine, and radionuclide chains. For porous media, only the global (three-dimensional) process simulator is used. For fractured media, the global process simulator is used for the fractured media, and the local (one-dimensional) process simulator is used for the rock matrix.

Basic Assumptions and Characteristics

  • Single-phase fluid flow governed by Darcy's law
  • Three-dimensional transport in the global system, and one-dimensional transport in the local rock-matrix subsystem
  • Local rock matrix may be characterized by either prisms or spheres
  • Linear variations in porosity and fluid density with respect to the dependent variables
  • Viscosity is dependent on temperature and brine concentrations only
  • Nonlinear isothermal equilibrium adsorption (Freundlich or linear)
  • Injection wastes are miscible with the resident fluids
  • Confined or unconfined aquifer (transient or steady-state free water surface)
  • Hydraulic and thermal conductivities may be heterogeneous and/or anisotropic
  • Longitudinal and transverse dispersivities may vary throughout the domain
  • Variable rock compressibility (storativity)
  • Dual or simulataneous discretization

Method of Solution Discretization is performed by the finite-difference method using centered or backward weighting in the time and space domains. Matrix solution is performed either by Gaussian elimination or by two-line successive overrelaxation.

Boundary Conditions A variety of boundary conditions and source terms may be invoked for both the porous and fractured media. These include:

  • Prescribed pressure (head), temperature, and brine concentration
  • Prescribed flux of fluid (water), heat, brine, or nuclide mass
  • Wellbore injection/production submodel subject to pumping constraints
  • Aquifer influence function (i.e., Carter-Tracy infinite reservoir)
  • Dual porosity domain extension
  • Waste-leach radionuclide submodel for waste repository nuclides and heat
  • Freewater surface with recharge


Typical Application

SWIFT can be applied to a variety of groundwater problems, ranging from simple well flow to complex transport analysis.
  • Deep-well injection of hazardous waste; isothermal/nonisothermal, constant/variable density
  • Seawater intrusion
  • Optimization of well fields to reduce intrusion and upconing
  • Prediction of hazardous waste migration
  • Well performance and pumping test analysis
  • Complex variable-block elevation and thickness data (input via a separate binary file)

Summary

With sufficient memory resources, SWIFT can be used to model complex field applications at a reasonable price. There is optional training available, and the package includes over 70 verification and sample problems.

Distribution, Requirements and Pricing

Licensing A single-node license is defined as a single PC or workstation installation. Additional licenses may be purchased, and each additional license includes a User's Guide.

Distribution and Installation The SWIFT for Windows package includes a User's Guide, Source Code, and data sets. All documentation is electronic using Adobe™ format and are distributed on CD. Executables for the FORTRAN are included. Installation of source code and data files is straightforward.

Basic Package:

  • SWIFT for Windows Data Input Guide
  • All FORTRAN source code and 70 verification problem input and output data sets on CD-ROM

Platform SWIFT for Windows is available on PC's only. It is compatible with the Windows® 95/98, and WindowsNT® v4.0 operating systems.

Other Required Software Modifications to SWIFT for Windows may require recompilations using Lahey® LF95 Fortran compiler. Postprocessing of two-dimensional maps can be contoured using UNSWIFT to create grid files for Surfer®, or the new SWIFT Output Data Reader, an ArcView product.

Installation Requirements:

  • Pentium® with 32+ MB RAM
  • Lahey® LF95
  • Surfer® for postprocessing

Ordering and Shipment Payment options include: check, Master Card, VISA, and pre-approved purchase orders (call first). The code will be delivered within 10 business days of full payment. For orders shipped within Virginia, sales tax of 4.5 percent must be added. Overseas deliveries are an additional $30.

Price - The SWIFT for Windows code includes installation support only.

  • Single-license:      $395
  • Additional or corporate support is available on a contract basis.
Download Order Form

Technical Support

Technical support is limited to installation and initial use. GeoTrans will provide advice, analysis, and suggestions for improvement of model application and use only under separate contract. Client confidentiality is maintained.
Download User's Guide
The entire SWIFT for Windows User's Guide is available in Adobe™ (.pdf) format. The file is 1.07 MB

Download Theory & Implementation
The entire SWIFT for Windows Theory and Implementation is available in Adobe (.pdf) format. The file is 1.35 MB

Optional Training Training is available for advanced users. GeoTrans will provide specialized training, either at your facility or at GeoTrans' Sterling, Virginia office. Typical training courses are three to five days, at a cost of approximately $1000 per day plus travel expenses. Please contact us for a specific cost estimate.

Please send EmailE-mail for more information or you can call us at 703-444-7000 in Virginia.
You can also obtain SWIFT and other hydrology programs from Scientific Software Group.

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