1. NAME AND TITLE

FEMWASTE/FEMWATER: A Finite-Element Model of Waste and Water Transport through Porous Saturated-Unsaturated Media.

2. CONTRIBUTORS

Nuclear Regulatory Commission, Washington, D. C.

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

Universita di Bologna, Italy through the NEA DB, Issy-les-Molineaux, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; CDC 7600. (C00451/C7600/00). Fortran77; PC386 (C00451/PC386/00).

4. NATURE OF PROBLEM SOLVED

FEMWASTE is a two-dimensional transient model for the transport of dissolved constituents through porous media. The transport mechanisms include: convection, hydrodynamic dispersion, chemical sorption, and first-order decay. The waste transport model is compatible with the water flow model (FEMWATER) for predicting convective Darcy velocities in porous media which may be partially saturated. Note that FEMWATER and a modified version of FEMWASTE, called BLT, are available as CCC-633 for personal computers. The PC version differs from the original 1980 version in the following ways: 1) the opening of the files is done by the program by means of an interactive request to the user for the names of the files to be opened; and 2) the input has been slightly modified by introducing free format reading and an header card before each set of data.

The Department of Defense, in partnership with the DOE, EPA, Cray Research, and 20 academic partners, developed the DoD Groundwater Modeling System.  The Waterways Experiment Station Coastal & Hydraulics Laboratory located in Vicksburg, Mississippi distributes GMS-FEMWATER, which includes 3DFEMWATER and LEWASTE (which includes 3DFEMWASTE).  More information is available on the www at http://ripple.wes.army.mil/software/gms/.

5. METHOD OF SOLUTION

Implementation of quadrilateral isoparametric finite elements, bilinear spatial interpolation, asymmetric weighting functions, several time-marching techniques, and Gaussian elimination are employed in the numerical formulation of the transport equation. The application of the finite element method ensures that mass balance over the whole region is preserved. A mixture-dependent retardation factor is employed in the definition of solute sorption.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for FEMWASTE.

8. COMPUTER HARDWARE REQUIREMENTS

FEMWASTE is operable on the CDC 7600 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required for the CDC version. The executable in the PC package was created with the Lahey F77L3 compiler Version 5.2. It runs in a DOS window of Windows95.
 
 

10. REFERENCES

G. T. Yeh and D. S. Ward, "FEMWASTE: A Finite Element Model of Waste Transport through Saturated-Unsaturated Porous Media," ORNL-5601 (April 1981).

G. T. Yeh, "Training Course No. 2: The Implementation of FEMWASTE (ORNL-5601) Computer Program," NUREG/CR-2706 (ORNL/TM-8328) (November 1982).

G. T. Yeh and D. S. Ward, "FEMWATER: A Finite Element Model of Water Flow through Saturated-Unsaturated Porous Media," ORNL-5567 (October 1980).

G. T. Yeh, "Training Course No. 1: The Implementation of FEMWATER (ORNL-5567) Computer Program," NUREG/CR-2705 (ORNL/TM-8327) (June 1982).

Sample Problems, input and output located on microfiche for CDC package.

G. T. Yeh, and D. S. Ward, "FEMWATER User Manual for PC MSDOS Version," ORNL-5567 (modified pages only, November 1991).

G. T. Yeh, and D. S. Ward, "FEMWASTE User Manual for PC MSDOS Version," ORNL-5601 (modified pages only, November 1991).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one diskette which contains the source code, sample problem input and data libraries, plus output from the sample problem. An executable is included in the PC version.

12. DATE OF ABSTRACT

March 1984, May 1996, revised September 1997.