Computer Programs

NESC9852 STFLO.

NESC9852 STFLO.

STFLO, Steady-State H2O Flow in Porous Media

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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1. NAME OR DESIGNATION OF PROGRAM: STFLO.

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2. COMPUTERS

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Program name	Package id	Status	Status date
STFLO	NESC9852/01	Tested	21-JUN-1988

Machines used:

Package ID	Orig. computer	Test computer
NESC9852/01	CDC CYBER 176	CDC CYBER 830

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3. DESCRIPTION OF PROGRAM OR FUNCTION

STFLO is a simple linear, finite-element code designed to simulate two-dimensional (areal or vertical) plane or axisymmetric ground-water flow in porous media. STFLO handles inhomogeneous anisotropic material properties, confined and semiconfined (leaky) aquifers, distributed or point sources, and specified heads or flux boundary conditions. A combination of quadrilateral and triangular elements may be used for the discretization of the flow domain.

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4. METHOD OF SOLUTION

The program solves the general partial differential equation which governs steady-state fluid flow in a two-dimensional anisotropic and heterogeneous material.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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6. TYPICAL RUNNING TIME:

NESC9852/01

The test cases included in this package were compiled and executed by NEA-DB on a CDC CYBER 830 computer in 9 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM

The primary application of STFLO is to estimate the rate of ground-water flow through a waste package by simulating the steady-state flow in the waste package and the surrounding rock. STFLO output consists of hydraulic heads at the nodes and velocities at the center of each finite element. STFLO is simple and inexpensive to apply. Its application is limited to isothermal, steady-state flow in a porous medium.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC9852/01	21-JUN-1988	Tested at NEADB

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10. REFERENCES:

NESC9852/01, included references:

- INTERA Environmental Consultants, Inc:
  STFLO: A Finite-Element Code for Steady-State Flow in Porous
  Media
  ONWI-428 (April 1983)

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11. MACHINE REQUIREMENTS: 74k words.

NESC9852/01

Maximum execution FL: 231,600 words.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC9852/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

NESC9852/01

NOS2 (CDC CYBER830).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

          C.R. Faust
          Geo Trans, Inc.

          B.S. RamaRao , T. Chan
          INTERA Environmental Consultants, Inc.

          M.J. Golis
          Office of Nuclear Waste Isolation
          Battelle Project Management Division
          505 King Avenue
          Colombus, Ohio 43201

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16. MATERIAL AVAILABLE

NESC9852/01

File name	File description	Records
NESC9852_01.001	INFORMATION FILE	42
NESC9852_01.002	STFLO FORTRAN SOURCE	826
NESC9852_01.003	TEST SAMPLE PROBLEM INPUT 1	56
NESC9852_01.004	TEST SAMPLE PROBLEM INPUT 2	326
NESC9852_01.005	TEST SAMPLE PROBLEM OUTPUT 1	172
NESC9852_01.006	TEST SAMPLE PROBLEM OUTPUT 2	667

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17. CATEGORIES

R. Environmental and Earth Sciences

Keywords: finite element method, geologic strata, ground water, radioactive waste storage, radionuclide migration, steady flow, two-dimensional.