last modified: 25-FEB-1993 | catalog | categories | new | search |

CCC-0526 IONMIG.

IONMIG, Radionuclide Migration Through Porous Media

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1. NAME OR DESIGNATION OF PROGRAM:  IONMIG.
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2. COMPUTERS
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Program name Package id Status Status date
IONMIG CCC-0526/01 Tested 25-FEB-1993

Machines used:

Package ID Orig. computer Test computer
CCC-0526/01 Many Computers DEC VAX 6000
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3. DESCRIPTION OF PROGRAM OR FUNCTION

IONMIG is used to calculate the far-field transport of decaying radionuclides through a porous medium by diffusion and convection. It was specifically developed in support of the U.S. Subseabed Disposal program. For user specified velocity and temperature fields the convection-diffusion equation is solved in a sorbing porous medium. The sorption may be a function of species type, concentration, vertical position and local temperature. The formulation used is applicable to two-dimensional planar or axisymmetric geometries. Zero flux conditions are assumed  at all but the upper boundaries.
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4. METHOD OF SOLUTION

MacCormac's method, which is an explicit two-step finite difference technique, is used to solve the transient two-dimensional center differenced advection-diffusion equation. Linear and bilinear functional forms are used to represent the variation of equilibrium sorption coefficient with temperature and concentration. Input and output are unnormalized and are in metric units.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Comparison with analytic solutions of simple problems which test the diffusion, convection and radioactive decay terms of the transport equation show good overall agreement. When concentrations fall several orders of magnitude below the peak value, the accuracy of the code diminishes due to discretization error and numerical diffusion. When convection is significant, there is some pulse distortion and phase  lag caused by operating below a Courant number of unity. These problems are accentuated when coupled with a variable equilibrium distribution coefficient.
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6. TYPICAL RUNNING TIME:  The sample problem takes 2.25 minutes on the  IBM 3033.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
CCC-0526/01 25-FEB-1993 Tested at NEADB
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10. REFERENCES:
CCC-0526/01, included references:
- Anthony J. Russo:
  A User's Manual for the Radionuclide Migration Code IONMIG
  SAND83-1276 (November 1984)
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11. MACHINE REQUIREMENTS

The code runs on VAX 11/750, CDC 7600, Cray 1 and IBM computers.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0526/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

A Fortran 77 compiler and the International Mathematical and Statistical Library  software are required.
CCC-0526/01
VMS 5.4-2 (VAX 6000-510).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Sandia National Laboratories
                Albuquerque, New Mexico, USA
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16. MATERIAL AVAILABLE
CCC-0526/01
File name File description Records
CCC0526_01.001 Information file 74
CCC0526_01.002 Command file to run IONMIG 8
CCC0526_01.003 IONMIG input file 17
CCC0526_01.004 IONMIG source file 3363
CCC0526_01.005 IONMIG output file 677
CCC0526_01.006 IONMIG executable file 0
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17. CATEGORIES
  • R. Environmental and Earth Sciences

Keywords: convection, diffusion, ground water, hydrology, natural convection, porous materials, radionuclide migration.