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iMOD User Manual version 4.4 (html)


10.5Data Set 4: Simulation mode

Data Set 4

NMULT,IDEBUG,IDOUBLE,IPOSWEL,ISCEN,IBDG,MINKD,MINC

NMULT

The number of areas to be computed sequentially. The areas need to be defined in Data Set 6. NMULT need to be 0 in case NSCL=0.

IDEBUG

A flag indicating the output frequency during a simulation:

0

Default configuration whereby a solution of the simulation is saved on disk after convergence, or whenever the number of iteration exceeds MXITER (see Data Set 5) and the simulation terminates thereafter.

1

Debug configuration whereby both input for the activated packages and intermediate solutions during the iteration process are saved on disk.

IDOUBLE

This option replaces the previous IEXPORT option which became obsolete since v3-series. By default IDOUBLE=0, which means that the results of the simulation will be single precision values. If IDOUBLE=1, the results will be double precision, keep in mind that in that case, all files will be doubles in size as well.

IPOSWEL

Flag indicating the assignment of well onto the model network:

0

Assignment of the well onto the single model grid cell is based on the x and y coordinates of the well.

1

Not supported in iMOD 4.x releases.

ISCEN

Flag indicating the usage of scenario definitions:

0

No usage of scenarios

1

Not supported in iMOD 4.x releases.

IBDG
(optional)

Flag indicating the definition of budget summation for packages:

0
(default)

Fluxes from packages (except CHD) within one single model cell are saved separately. As a result the output file name convention (see ILSAVE in Data Set 8) will include a system number, e.g. BDG_SYS1_STEADY_STATE_L1.IDF.

1

All fluxes will be summed per model layer per item. As a result multiple river systems will be saved in a single output file, e.g. BDG_STEADY-STATE_L1.IDF.

For each stressperiod this is overwritten by the ISUMSAVE parameter that might be specified.

MINKD
(optional)

Minimal value for transmissivity (m\({}^{2}\)/day). Use MINKD \(> 0\) for reasons of stability in combination with horizontal anisotropy.

MINC
(optional)

Minimal value for the vertical resistance (days). Use MINC \(> 1\) for reasons of stability and to avoid large contrasts between horizontal en vertical conductances. Especially whenever the cell size (CELLSIZE) increases, it could be advisable to specify MINC \(> 1\).