RSICC CODE PACKAGE CCC-679

1. NAME AND TITLE

SWIFT: Code System to Calculate Waste-Isolation Flow and Transport.

2. CONTRIBUTORS

Sandia National Laboratories, Albuquerque, New Mexico through the Energy Science and Technology Software Center, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; CDC7600 (C00679C760000).

4. NATURE OF PROBLEM SOLVED

SWIFT solves the coupled or individual equations governing fluid flow, heat transport, brine displacement, and radionuclide displacement in geologic media. Fluid flow may be transient or steady state. One, two, or three dimensions are available, and transport of radionuclides chains is possible.

5. METHOD OF SOLUTION

Finite differencing is used to discretize the partial differential equations in space and time. The user may choose centered or backward spacial differencing, coupled with either central or backward temporal differencing. The matrix equation may be solved iteratively (two line successive-over-relaxation) or directly (special matrix banding and gaussian elimination).

6. RESTRICTIONS OR LIMITATIONS

On the CDC7600 in direct solution mode, the maximum number of grid blocks allowed is approximately 1400.

7. TYPICAL RUNNING TIME

Execution time is dependent on problem characteristics.

8. COMPUTER HARDWARE REQUIREMENTS

70,000 (octal) words of memory are reqired to compile the SWIFT source. 130,000 (octal) words of small core memory (SCM) and 400,000 (octal) words of large core memory (LCM) are needed to execute the sample problems.

9. COMPUTER SOFTWARE REQUIREMENTS

SCOPE 2.1 and a Fortran IV compiler are required.

10. REFERENCES

a) Included in documentation:

M. Reeves, R. M. Cranwell, "User's Manual for the Sandia Waste-Isolation Flow and Transport Model (SWIFT) Release 4.81," NUREG/CR-2324 & Errata (November 1981).

b) Background information:

R. T. Dillon, R. B. Lantz and S. B. Pahwa, "Risk Methodology for Geologic Disposal of Radioactive Waste: The Sandia Waste Isolation Flow and Transport (SWIFT) Model," NUREG/CR-0424, SAND78-1267 (October 1978).

N. C. Finley, M. Reeves, "SWIFT Self-Teaching Curriculum," Illustrative Problems to Supplement the User's Manual for the Sandia Waste-Isolation Flow and Transport Model (SWIFT)," NUREG/CR-1968, SAND81-0410 (March 1982).

11. CONTENTS OF CODE PACKAGE

Included in the package are the referenced document in (10.a) and one 3.5" DOS-formatted diskette containing source code and sample problems. No executables are included with the package.

12. DATE OF ABSTRACT

October 1999.

KEYWORDS: HYDRODYNAMICS; WASTE MANAGEMENT