NESC9831 NETFLO.
NETFLO, 3-D Steady-State Ground-Water Flow in Heterogeneous Medium
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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| 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 |
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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.
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.
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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.
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.
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NESC9831/01, included references:
- INTERA Environmental Consultants, Inc:NETFLO: A Network Ground-Water Flow Code
ONWI-425 (April 1983)
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NESC9831/01
To run the test cases on a CDC CYBER 740 computer, 112,043 (octal) words of main storage were required.[ 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 ]
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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 |
Keywords: fluid flow, ground water, network analysis, radioactive waste storage, radionuclide migration, steady-state conditions, three-dimensional.