3-D Model to Simulate Ground-Water Flow, Heat, Brine and Radio Nuclide Transport
Three-Dimensional Groundwater Flow and Transport
Pressure, Temperature, Brine, Radionuclides
Dual Porosity and Fractured Media
SWIFT/486 is a fully-transient, three-dimensional model to simulate ground-water flow, heat (energy), brine and radionuclide transport in porous and fractured geologic media. The primary equations for fluid (flow), heat and brine are coupled by fluid density, viscosity and porosity. In addition to transient analysis, SWIFT/486 offers a steady-state option for coupled flow and brine. The equations are solved using central or backward spatial and time weighting approximations by the finite-difference method. In addition to Cartesian, cylindrical grids may be used. Contaminant transport includes advection, dispersion, sorption and decay, including chains of constituents. Both dual-porosity and discrete-fracture representations along with rock matrix interactions may be simulated. The non-linearities resulting from water table and variable density are solved iteratively.
A run-time monitor displays the simulations progress, convergence, mass balance, and dialog.
Versatile interface to SURFER for contouring pressure, temperature and concentration.
Extensive error checking.
Auxiliary files for variable structure grid, restart, mapping, mass balance, well summary and concentration discharge.
STLINE code for particle tracking.
Easy installation, 70 verification QA/QC data sets.
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 simultaneous 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.
SWIFT/486 comprises 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.
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
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
Hazardous waste site characterization and remediation (RI/FS)
Pump-and-treat, hydraulic containment and other waste remediation
Salt-water intrusion, upconing
Aquifer thermal energy storage
High-level radioactive waste performance assessment
Fractured media, dual porosity
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.
The runtime monitor displays essential simulation data on a conventional PC monitor using standard ANSI characters. The 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.
SWIFT/486 Data Input Guide
SWIFT and SWIFT II documents (4 publicly available NTIS reports)
All FORTRAN source code and 70 verification problem input and output data sets on diskettes
With sufficient memory resources, SWIFT can be used to model complex field applications at a reasonable price. SWIFT users can choose either support or nonsupported. Optional training is available.
Requirements 486/Pentium with 8 to 32 MB RAM and Lahey F77L-EM/32 compiler.
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Τελευταία Ενημέρωση 27 Ιουλίου 2004 - Last Revised on July 27, 2004
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