Accession Number : ADA294464

Title :   Evaluation of SWIFT/486 Model with Analytical Solutions.

Descriptive Note : Final rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB

Personal Author(s) : Zakikhani, Mansour

PDF Url : ADA294464

Report Date : APR 1995

Pagination or Media Count : 316

Abstract : This report describes the evaluation of SWIFT/486 by comparing computed results with six selected analytical solutions for several flow and solute transport scenarios of varying boundary conditions and solute sources in porous media. SWIFT/486 (Sandia Waste-Isolation Flow and Transport) is a three-dimensional, finite difference code which can be used to simulate steady-state or transient flow and transport of chemicals (including brine and radionuclide) and beat in porous or fractured geologic media. The geologic media may be homogeneous, isotropic, heterogeneous, and/or anisotropic. The transport processes which may be modeled by SWIFT/486 include advection, dispersion, sorption, decay, and leaching. Fluid flow of variable densities and/or viscosities also may be modeled by SWIFT/486. Either a radial or Cartesian coordinate system can be used for domain discretization. The present version of SWIFT/486 is classified as a single phase and saturated flow model. The evaluation performed here complements previous SWIFT evaluations and applications. The model also was reviewed for efficiency of coding, convenience of input/output, program portability, and available diagnostic messages. Note that although only part of the above evaluation steps are described in detail in this report, the conclusions for all are given. Overall, SWIFT/486 is a relatively efficient code, requires optimal amount of computer storage, and has sufficient diagnostic flags. SWlFT/4S6 simulations matched closely the analytical solutions to several simplified problems. (AN)

Descriptors :   *MATHEMATICAL MODELS, *AQUIFERS, *GROUND WATER, ALGORITHMS, COMPUTERIZED SIMULATION, SCENARIOS, STEADY STATE, TRANSIENTS, DENSITY, WATER FLOW, OPTIMIZATION, PARAMETERS, EFFICIENCY, INPUT OUTPUT PROCESSING, GEOLOGY, SATURATION, BOUNDARIES, FINITE DIFFERENCE THEORY, SEDIMENT TRANSPORT, FLOW FIELDS, SOLUTIONS(GENERAL), SOLUTES, TWO DIMENSIONAL FLOW, COMPUTER PROGRAM VERIFICATION, VISCOSITY, SIMPLIFICATION, ADVECTION, SORPTION, LEACHING, POROUS MATERIALS, WATER WELLS, STEADY FLOW, CARTESIAN COORDINATES.

Subject Categories : Geology, Geochemistry and Mineralogy
      Hydrology, Limnology and Potamology
      Operations Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE