Abstract
The FORTRAN IV program DIFMIG calculates one-dimensionally (i.e. column) the diffusive migration of single substances through arbitrary multi-barrier systems according to the diffusion equation
∂C/∂+ = D'(t)∂2C/∂x2 + F'(C,t)
where D'(t) is the effective dispersion coefficient and F'(C,t) is a function responsible for time dependent changes in concentration other than dispersion/diffusion (e.g. slow dissolution of a compound from a repository, radioactive decay, and/or build up of daughter products. The method takes possible time dependent variations in the effective dispersion into account.
The diffusion equation is solved by a finite difference implicite method, the resulting trigonal matrix equation being solved by standard methods.
∂C/∂+ = D'(t)∂2C/∂x2 + F'(C,t)
where D'(t) is the effective dispersion coefficient and F'(C,t) is a function responsible for time dependent changes in concentration other than dispersion/diffusion (e.g. slow dissolution of a compound from a repository, radioactive decay, and/or build up of daughter products. The method takes possible time dependent variations in the effective dispersion into account.
The diffusion equation is solved by a finite difference implicite method, the resulting trigonal matrix equation being solved by standard methods.
| Original language | English |
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| Place of Publication | Roskilde, Denmark |
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| Publisher | Risø National Laboratory |
| Number of pages | 32 |
| ISBN (Print) | 87-550-0810-0 |
| Publication status | Published - 1981 |
| Series | Risø-M |
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| Number | 2262 |
| ISSN | 0418-6435 |
Keywords
- Risø-M-2262
- D codes
- Diffusion lenght
- Finite difference method
- Migration length
- One-dimensional calculations
- Radionuclide migration