Category Contaminant transport (3D)
Platform DOS, Lahey LF90 Version 4.5, SURFER for postprocessing
Status Commercial
Description 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. 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; 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: 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.
Cost US Dollars 395
Data formats supported None stated
Supplier in United States of America  International Ground Water Modeling Center 

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