CCC-0526 IONMIG.
IONMIG, Radionuclide Migration Through 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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| 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.
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.
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.
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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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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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED
A Fortran 77 compiler and the International Mathematical and Statistical Library software are required.
A Fortran 77 compiler and the International Mathematical and Statistical Library software are required.
CCC-0526/01
VMS 5.4-2 (VAX 6000-510).[ top ]
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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 |
Keywords: convection, diffusion, ground water, hydrology, natural convection, porous materials, radionuclide migration.