| MODFLOW |
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| Pre-processing |
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MODFLOW Commands |
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Building a MODFLOW Model |
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Map to MODFLOW |
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Calibration |
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Packages Supported in GMS |
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Saving a MODFLOW Simulation |
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Importing MODFLOW Files |
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Unsupported MODFLOW Features |
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Run MODFLOW |
| Post-processing |
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MODFLOW Display Options |
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MODFLOW Post-Processing Viewing Options |
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Reading a MODFLOW Simulation |
| Tutorials |
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| Packages |
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| Flow: |
BCF6, HUF, LPF, UPW |
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| Solvers: |
DE4, GMG, NWT, PCG,
PCGN, LMG, SIP, SOR,
SMS |
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| Other: |
BAS6, BFH, CHD1, CLN,
DRN1, DRT1, EVT1, ETS1,
GAGE, GHB1, GNC, HFB1,
HUF, LAK3, MNW1, MNW2,
OUT1, RCH1, RIV1, SFR2,
STR1, SUB1, SWI2, WEL1,
UZF1 |
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The LMG1 package is a solver package for MODFLOW supported by GMS. The LMG1 package as been replaced with the LMG package in GMS 8.1 and later.
Maximum outer iterations
This value is the maximum iterations, or calls to the solver. For linear problems, this value can be 2. For non linear problems, this values should be larger, but generally less than 50.
Maximum inner iterations
This value is the maximum number of iterations per call to the solver. The default value is 50, and this is sufficient for most problems.
Acceleration type
Three different acceleration methods are available: constant, adaptive damping using the Cooley method, or adaptive damping using the relative reduced residual. Refer to the official package documentation for more explanation on the different damping methods.
Accleration Parameter
This value is used if the acceleration method is set to constant. Usually, this value is 1.0, but for some problems lower values may help achieve convergence.
Max Acceleration
This is the max damping value when using the adaptive damping with relative reduced residual.
Min Acceleration
This is the min damping value when using the adaptive damping with relative reduced residual.
Budget Closure Criterion
When the scaled norm of the matrix equations is less than this value then the solver iteration stops.
Conjugate Gradient
Controls whether the conjugate gradient method is used to accelerate the solver. By default this option is on.
Stor1, Stor2, Stor3
These variables are used to control the amount of memory storage used by the solver. The defaults rarely need to be changed.
Reset
This button will change all options to the default state.
