last modified: 12-JAN-1988 | catalog | categories | new | search |

NESC9831 NETFLO.

NETFLO, 3-D Steady-State Ground-Water Flow in Heterogeneous Medium

top ]
1. NAME OR DESIGNATION OF PROGRAM:  NETFLO.
top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
NETFLO NESC9831/01 Tested 12-JAN-1988

Machines used:

Package ID Orig. computer Test computer
NESC9831/01 CDC CYBER 176 CDC CYBER 740
top ]
3. DESCRIPTION OF PROGRAM OR FUNCTION

NETFLO simulates three-dimensional, ground-water flow in a heterogeneous medium idealized as a flow through an equivalent network of series and parallel flow members under steady-state flow conditions. The algorithm is based on the application of Darcy's law along each member and conservation of mass at each node. NETFLO determines the  pressure at all nodes, and velocities and fluxes in all members, for all possible flow paths from a repository node to the discharge node, and the pertinent mean flow and transport characteristics along each path, for use as input to a one-dimensional nuclide transport program like GETOUT.
top ]
4. METHOD OF SOLUTION:
top ]
5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
top ]
6. TYPICAL RUNNING TIME:
NESC9831/01
NEA-DB ran the test cases included in this package on a CDC CYBER 740 computer. The CPU times required were 0.34 seconds for each of the cases.
top ]
7. UNUSUAL FEATURES OF THE PROGRAM

The program is ideally suited to parametric studies and sensitivity analyses because of reduced computer time requirements compared with those for a rigorous three-dimensional code. NETFLO is particularly useful for assessment of a nuclear waste repository site, or analyzing flow through an engineered repository system. A network representation of flow through the geologic media may be based on stratigraphic considerations. Where the stratigraphy does not suggest a particular network configuration, a network may be specified along principal stream tubes defined using a more detailed, three-dimensional ground-water flow code. A network topology for flow through the engineered repository system is readily defined by  shafts, corridors, and rooms that constitute the repository. A special application is to analysis of flow through a system of discrete fractures; such applications support fracture flow tests conducted in a laboratory or in underground mines.
top ]
8. RELATED AND AUXILIARY PROGRAMS:
top ]
9. STATUS
Package ID Status date Status
NESC9831/01 12-JAN-1988 Tested at NEADB
top ]
10. REFERENCES:
NESC9831/01, included references:
- INTERA Environmental Consultants, Inc:
  NETFLO: A Network Ground-Water Flow Code
  ONWI-425 (April 1983)
top ]
11. MACHINE REQUIREMENTS:  40K words.
NESC9831/01
To run the test cases on a CDC CYBER 740 computer, 112,043 (octal) words of main storage were required.
top ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC9831/01 FORTRAN-IV
top ]
13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  NOS 1.4 (CDC CYBER176), NOS 2.5.1 (CDC CYBER740).
NESC9831/01
NOS2.5.1 664/650 (CDC CYBER 740)
top ]
14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
top ]
15. NAME AND ESTABLISHMENT OF AUTHORS

         M.J. Golis
         Office of Nuclear Waste Isolation
         Battelle Project Management Division
         505 King Avenue, Columbus, Ohio 43201
top ]
16. MATERIAL AVAILABLE
NESC9831/01
File name File description Records
NESC9831_01.001 Information file 49
NESC9831_01.002 Control Information and JCL 18
NESC9831_01.003 NETFLO FORTRAN source 837
NESC9831_01.004 Example-1 sample problem 41
NESC9831_01.005 Example-2 sample problem 50
NESC9831_01.006 Example-1/2 output 628
top ]
17. CATEGORIES
  • R. Environmental and Earth Sciences

Keywords: fluid flow, ground water, network analysis, radioactive waste storage, radionuclide migration, steady-state conditions, three-dimensional.