MOMOP
MOMOP describes additional options as shown in Table 17.
Free format for 26 parameters. Or Format(26I1)
MOP2(I), I = 1,26
In TOUGH4, input with keyword "MOMOP" becomes obsolete. Its Input can be replaced by input of IE array through keyword "SELEC". if any element in IE(101)-IE(126) is not 0, it will replace corresponding element in MOP2(1)-MOP2(26). Therefore, using MOMOP is not encouraged in TOUGH4.
Table 17. More Options
MOP2
Value
Description
1
0, 1
2
Minimum number of Newton-Raphson iterations
Allow convergence in a single Newton-Raphson iteration
Perform at least two iterations; primary variables are always updated.
2
Void
3
Void
4
0
>0
Vapor pressure reduction
No vapor pressure reduction at low liquid saturation
Reduces vapor pressure for Sl < 0.02 to prevent liquid disappearance by evaporation (only certain EOS modules)
5
0
>0
Active Fracture Model (Appendix C)
Active Fracture Model applied to liquid phase only
Active Fracture Model applied to all phases
6
0
>0
Leverett scaling of capillary pressure
No Leverett scaling
Rescale capillary pressure: if element-specific permeabilities are specified
7
Void
8
Void
9
0
>0
Time stepping after time-step reduction to honor printout time
Continue with time step imposed by forced time-step reduction
Continue with time step used before forced time-step reduction (may conflict with time-step size for time-dependent honoring source/sink or first-type boundary.)
10
0
1
2
Writing SAVE file
Write SAVE file only at the end of a forward run
Write SAVE file after each printout time
Write separate SAVE files after each printout time
11
0
1 2
Water properties
International Formulation Committee (1967)
IAPWS-IF97
IAPWS-95
12
0
>0
Enthalpy of liquid water
Potential energy not included in enthalpy of liquid water
Potential energy included in enthalpy of all phases (Stauffer et al., 2014)
13
0
>0
Adjustment of Newton-Raphson increment weighting
No adjustment
Reduce WNR by MOP2(13) percent if Newton-Raphson iterations oscillate and time step is reduced because ITER=NOITE
14
Void
15
0
>0
Porosity used for calculation of rock energy content
Use porosity of block ROCKS; this assumes that the porosities provided in block INCON were the result of a pore compressibility/expansivity calculation; the “original” porosity from block ROCKS is used to compensate for equivalent rock-grain density changes.
Use porosity from block INCON; this assumes that these porosities were not the result from a pore compressibility/expansivity calculation; changes in rock-grain density due to pore compressibility/expansivity are not compensated.
16
Void
17
0
1
Variables printed on FOFT files (time series)
Print variables according to input data in block FOFT
Print variables according to input data in block OUTPU
18
0
1
Adjustment of time step size to coincide with transient boundary times.
No adjustment
Do the adjustment
19
0
1
Use anisotropic permeability values kx, ky and kz of rocks to construct
the diagonal of the permeability tensor.
No
Yes
20
Void
21
0
>0
Honoring generation times in blocks TIMBC.
Time stepping ignores times specified in block TIMBC
Time steps adjusted to match times in block TIMBC
22
Void
23
Void
24
Void
25
0
1
Check mesh for duplicate element names
Do not check the mesh
Check the mesh
26
0
1
2
3
Printout format
Both traditional output and CSV formats
CSV/TECPLOT format (types separated; times combined)
CSV/TECPLOT format (types separated; times separated)
CSV/TECPLOT format (types combined; times combined)
Used in: All EOS modules
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