ESTS0576: GRIDMAKER, 2-D, 3-D Finite Element Method Grid Generation for Ground Water and Pollutant Transport

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ESTS0576 GRIDMAKER. (Abstract last modified 18-JUN-1996)

GRIDMAKER, 2-D, 3-D Finite Element Method Grid Generation for Ground Water and Pollutant Transport

Abstract Table of Contents:

OPERATING SYSTEM

OTHER RESTRICTIONS

1. NAME OR DESIGNATION OF PROGRAM - GRIDMAKER.

2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name Package-ID Status GRIDMAKER ESTS0576/01 Tested

Machines used: Package-ID Orig.Computer Test Computer ESTS0576/01 Many Computers Many Computers

3. DESCRIPTION OF PROGRAM OR FUNCTION - GRIDMAKER serves as a preprocessor for finite element models in solving two- and three-dimensional subsurface flow and pollutant transport problems. It is designed to generate three-point triangular or four-point quadrilateral elements for two-dimensional domains and eight-point hexahedron elements for three-dimensional domains. A two-dimensional domain of an aquifer with a variable depth layer is treated as a special case for depth-integrated two-dimensional, finite element subsurface flow models. The program accommodates the need for aquifers with heterogeneous systems by identifying the type of material in each element.

4. METHOD OF SOLUTION - Based on the method of conformal mapping, the generation of interior nodal points within the two-dimensional domain of interest is performed numerically by the boundary integral element method (BIEM). For a three-dimensional domain, the BIEM techniques are applied in the projected horizontal plane, while the vertical coordinate is transformed by a normalized transformation using local layer thickness.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM -

6. TYPICAL RUNNING TIME - Most problems run in seconds to minutes.

ESTS0576/01:

The sample problem was executed in three different types of computers: 1) PC-Brett Pentium processor of 75 MHz running MS-DOS 6.2; 2) DEC VAX 6000/510 running OpenVMS V6.1; 3) DEC 3000 Model 300X - Alpha AXP Architecture Workstation running DEC OSF/1 V3.2. The time required to run the sample problem on the VAX under OpenVMS V6.1 is 2.8 seconds (CPU time). On the PC Brett, Pentium processor of 75 MHz, 2.8 seconds (elapsed time) are required to run the sample problem. Only a few tenths of seconds are required in the DEC 3000 Model 300X (Alpha AXP Workstation).

7. UNUSUAL FEATURES OF THE PROGRAM - GRIDMAKER generates grids for groundwater models and has capability for flexible geometry grids.

8. RELATED AND AUXILIARY PROGRAMS - FEWA and 3DFEMWATER are groundwater modeling codes which have been used with GRIDMAKER.

9. STATUS
ESTS0576/01: 18-JUN-1996 Tested at NEADB

10. REFERENCES  -
ESTS0576/01:
- T.K. Tsay et al.:
  Gridmaker: A Grid Generator for Two- and Three- Dimensional Finite
  Element Subsurface Flow Models
  ORNL-6613 (June 1990)

11. MACHINE REQUIREMENTS - None specific to code in current dimensioning.

ESTS0576/01:

The peak working set size to execute the sample problem on the VAX under OpenVMS V6.1 is 412 Kbyte - On the PC Brett, Pentium processor of 75 MHz, base memory 640 Kbyte and extended memory of 16 MByte, the filesize of the executables created with the Lahey compiler system F77L/EM-32 (compiler Version 5.20 and linker Version 5.1L and "-STUB RUNB" option activated at linkage) is 1.25 Mbyte - On the Alpha/AXP architecture workstation under OSF/1 V3.2 with 96 MByte available memory, the filesize of the executable created with the DEC Fortran (f77) compiler V3.4 is 80 Kbyte.

12. PROGRAMMING LANGUAGE(S) USED -
ESTS0576/01: FORTRAN-77

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - VAX/VMS.

ESTS0576/01:

The program GRIDMAKER was compiled, linked and executed in three different types of computers running three different types of operating systems: 1) PC-Brett Pentium processor of 75 MHz running MS-DOS 6.2. The Lahey F77L/EM-32 compiler (version 5.20) and linker (Version 5.1L) were used to compile the GRIDMAKER executable. 2) DEC VAX 6000/510 running OpenVMS V6.1; the DEC Fortran-77 compiler was used to compile the GRIDMAKER executable. 3) DEC 3000 Model 300X - Alpha AXP Architecture Workstation running OSF/1 version 3.2; the DEC fortran compile f77 (V3.4) was used to compile the GRIDMAKER executable.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - Mouse
option is currently available. Slight mapping errors are present. Input grid boundaries slightly off from output and boundaries. Program uses a multiple implied do list in some of its output statements. Depending on the compiler used, these three statements may have to be changed to work. The logic is straightforward, the only potential problem is with the single line statement format.

15. NAME AND ESTABLISHMENT OF AUTHORS -
  T.K. Tsay
  Syracuse University, NY (United States)
  G.T. Yeh
  Pennsylvania State University, College Station (United States)
  G.V. Wilson
  University of Tennessee, Knoxville (United States)
  L.E. Toran
  Oak Ridge National Laboratory, TN (United States)

16. MATERIAL AVAILABLE -
ESTS0576/01:
ESTS0576_01.001   Information file of the program GRIDMAKER         201 records
ESTS0576_01.002   Source file of the program GRIDMAKER             1221 records
ESTS0576_01.003   Batch file to create the GRIDMAKE executable       35 records
ESTS0576_01.004   Executable of program GRIDMAKER (for PC's)          0 records
ESTS0576_01.005   Auxiliary file of Lahey runtime errors              0 records
ESTS0576_01.006   VMS command file to create the GRIDMAKE exec       20 records
ESTS0576_01.007   Sample input file to run the GRIDMAKE exec .       33 records
ESTS0576_01.008   Sample ouput file (VAX under OpenVMS)            2799 records
ESTS0576_01.009   Auxiliary output file (VAX under OpenVMS)          57 records
ESTS0576_01.010   Sample output file (PC-Pentium under MS-DOS)     2799 records
ESTS0576_01.011   Auxiliary output file (PC-Pentium, MS-DOS)         57 records
ESTS0576_01.012   Sample output file (DEC Alpha under OSF/1)       2799 records
ESTS0576_01.013   Auxiliary output file (DEC Alpha, OSF/1)           57 records
ESTS0576_01.014   DOS file-names                                     14 records

17. CATEGORIES -

- H. Heat Transfer and Fluid Flow
- L. Data Preparation
- R. Environmental and Earth Sciences

Keywords: ENVIRONMENTAL TRANSPORT, FINITE ELEMENTS, FLOW MODELS, FLUID FLOW, GROUND WATER, THREE-DIMENSIONAL, TWO-DIMENSIONAL

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