|SWIFT-98||Order No: TPS 41|
SWIFT-98 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.
SWIFT - 98 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
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.
A variety of boundary conditions and source terms may be invoked for both the porous and fractured media. These include:
SWIFT can be applied to a variety of groundwater problems, ranging from simple well flow to complex transport analysis.
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.
Pentium with 32+ MB RAM, Lahey LF90, Version 4.5, SURFER for postprocessing
Custodian: GeoTrans, Inc., Sterling, VA.