1. NAME AND TITLE
FE3DGW: Code System for Finite-Element, Three-Dimensional Ground-Water Flow Analysis.
Office of Nuclear Waste Isolation, Battelle Memorial Institute, Columbus, Ohio.
3. CODING LANGUAGE AND COMPUTER
Fortran 77; VAX.
4. NATURE OF PROBLEM SOLVED
FE3DGW is a code system for analyzing flow through large, multilayered ground-water systems.
The code has the capability to model noncontinuous and continuous layering, time-dependent and
constant sources/sinks, and transient as well as steady state flow. The code offers a wide choice in
specifying boundary conditions like prescribed heads, nodal injection or withdrawal, constant or
spatially varying infiltration rates, and elemental source/sink. Initial conditions can be prescribed as
vertically hydrostatic or variable hydraulic head. The heterogeneity in aquifer permeability and
porosity can be described by geologic unit or explicitly for given elements.
5. METHOD OF SOLUTION
The code solves the partial differential equation for hydraulic head in large, multilayered natural
systems by the finite element method. The geologic input data for a complex, multilayered ground-water system is reduced to hydrologic interpretation in the form of well logs at each surface node and
subdivision of the entire region into two-dimensional elements. To facilitate interaction between
disciplines, support programs were developed for plotting the finite element grid with well logs
(PLOTEL3D), drawing contour maps (FEPLTI and FEPLT), and generation of rectangular grid data
from irregular grid data to display three-dimensionally both the input data used for the simulation and
the results (GRIDFE). The graphic displays are generated directly from the simulation input and
output files. The program, TVL3D, delineates travel pathlines and travel times for use in radionuclide
and other contaminant transport codes.
6. RESTRICTIONS OR LIMITATIONS
The code does not account for density variation and calculates only the hydraulic heads.
7. TYPICAL RUNNING TIME
The computational codes required only a few seconds to execute each of the sample cases on the
8. COMPUTER HARDWARE REQUIREMENTS
This VAX 11/780 version is an update of the PDP 11/70 version and was tested by RSIC on a
9. COMPUTER SOFTWARE REQUIREMENTS
This version was implemented under the VMS 3.5 operating system and tested by RSIC under
VMS 4.7. The proprietary CalComp and DISSPLA graphics software were used to generate graphical
S. K. Gupta, C. R. Cole, F. W. Bond, and A. Monti, "Finite-Element Three-Dimensional Ground-Water (FE3DGW) Flow Model: Formulation, Computer Source Listings, and User's Manual,"
BMI/ONWI-548 (October 1984).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: COMPLEX GEOMETRY; FINITE ELEMENT METHOD; LIQUID PATHWAY; NUCLIDE TRANSPORT; RADIONUCLIDES; WASTE MANAGEMENT