SWIFT/486

3-D Model to Simulate Ground-Water Flow, Heat, Brine and Radio Nuclide Transport

Three-Dimensional Groundwater Flow and Transport

Pressure, Temperature, Brine, Radionuclides

PC Interface

Dual Porosity and Fractured Media

SWIFT OVERVIEW

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.

FEATURES

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.

EQUATIONS

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.

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 APPLICATIONS

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

POSTPROCESSING

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.

RUNTIME MONITOR

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.

BASIC PACKAGE

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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