Page:4SIGHT manual- a computer program for modelling degradation of underground low level waste concrete vaults (IA 4sightmanualcomp5612snyd).pdf/99

18. GLOBAL VARIABLES 18. Global variables.

Most of these are variables that will be changed by the input file. The listing is broken into major groups: material parameters, scaling parameters, etc.

19. Transport parameters. These are the parameters defined at each element that determine the rate of transport. These include the inverse formation factor $$\xi$$, pressure $$\Psi$$, and the porosity $$\phi$$.

⟨Global variables 4⟩$$+\equiv$$ real $$\xi$$[NUM_CELLS];   /* changing formation factor */ real $$\xi'$$[NUM_SURFACES];    /* changing formation factor at the surface */ real $$\Psi$$[NUH.SURFACES];     /* Pressure */ real $$\phi^n$$[NUM_CELLS];    /* current porosity */ real $$\phi'^n$$[NUM_SURFACES];   /* porosity at the surface */ real $$\phi'^{n-1}$$[NUM_SURFACES];    /* previous porosity at concentration */ real litre[NUM_SURFACES];    /* litres of solution (surface area)*/ real strength [NUM_SURFACES];    /* strength in psi */ int FIRST_CELL = 0;    /* first active cell  number */

20. User specified parameters. These parameters determine the ultimate properties of the sample. Although default values are given, user specified values will override these values.

⟨Global variables 4⟩ $$+\equiv$$ MATERIAL thickness = {1.0,TRUE};     /* roof thickness */ MATERIAL neutral-axis.depth = {0.75, TRUE};    /* depth of neutral axis */ MATERIAL $$k_\infty$$ = {2.5- 10E-18,TRUE};    /* ultimate permeability */ MATERIAL $$d_\infty$$ = {5.7 10E-12,TRUE};    /* ultimate diffusivity */ MATERIAL head = {5.0, TRUE};    /* external pressure head */ MATERIAL wc = {0.45, TRUE};    /* water:cement */ MATERIAL Youngs = {20.0E-06,TRUE};    /* Young’s modulus */ MATERIAL $$\beta$$ = {$$1.8\cdot10^{-06}$$, TRUE};    /* linear strain coefficient */ MATERIAL CE = {350., TRUE};    /* conc. sulfate as ettringite */ MATERIAL roughness = {1.0, TRUE};    /* roughness factor */ MATERIAL $$\gamma$$ = {10.0,TRUE};    /* fracture surface energy */ MATERIAL $$\nu$$ = {0.2,TRUE};    /* Poisson ration */

21. Scaling parameters.

⟨Global variables 4⟩ $$+\equiv$$ real $$L$$ = 0.010;  /* length of ELEMENTS so that ΔX = 1 * / real $$D_0$$ = $$1.0\cdot10^{-11}$$;      /* scaling diffusivity */ real $$k_0$$ = $$1.0\cdot10^{-18}$$;      /* scaling permeability */ real $$\Delta{T}$$ =1.0;       /* dimensionless time increment */ real $$\Delta{X}$$[NUM_SURFACES];      /* dimensionless length between each cell */