GMS:PCG Package: Difference between revisions

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The Preconditioned Conjugate Gradient Method (PCG) package is one of the [[GMS:MODFLOW Packages Supported in GMS#Solver Packages|solver packages]] for MODFLOW supported by GMS.
The Preconditioned Conjugate Gradient Method (PCG) package is one of the [[GMS:MODFLOW Packages Supported in GMS#Solver Packages|solver packages]] for MODFLOW supported by GMS.


''Maximum outer iterations''
''Maximum outer iterations (MXITER)''
<blockquote style="margin-top:0px; margin-bottom:0px;">
<blockquote style="margin-top:0px; margin-bottom:0px;">
This value is the maximum iterations, or calls to the solver.  For linear problems, this value can be 1, unless more than 50 inner iterations are required, when maximum outer iterations could be as large as 10.  For non linear problems, this values should be larger, but generally less than 100.</blockquote>  
This value is the maximum iterations, or calls to the solver.  For linear problems, this value can be 1, unless more than 50 inner iterations are required, when maximum outer iterations could be as large as 10.  For non linear problems, this values should be larger, but generally less than 100.</blockquote>  


''Maximum inner iterations''
''Maximum inner iterations (ITER1)''
<blockquote style="margin-top:0px; margin-bottom:0px;">
<blockquote style="margin-top:0px; margin-bottom:0px;">
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.
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.
</blockquote>
</blockquote>


''Matrix Preconditioning Method''
''Matrix Preconditioning Method (NPCOND)''
<blockquote style="margin-top:0px; margin-bottom:0px;">
<blockquote style="margin-top:0px; margin-bottom:0px;">
Use this radio group to choose the matrix conditioning method.  The default is to use a modified incomplete cholesky method.</blockquote>
Use this radio group to choose the matrix conditioning method.  The default is to use a modified incomplete cholesky method.</blockquote>

Revision as of 14:37, 1 November 2016

MODFLOW
Pre-processing
MODFLOW Commands
Building a MODFLOW Model
Map to MODFLOW
Calibration
Packages Supported in GMS
Saving a MODFLOW Simulation
Importing MODFLOW Files
Unsupported MODFLOW Features
Run MODFLOW
Post-processing
MODFLOW Display Options
MODFLOW Post-Processing Viewing Options
Reading a MODFLOW Simulation
Tutorials
Packages
Flow: BCF6, HUF, LPF, UPW
Solvers:

DE4, GMG, NWT, PCG,

PCGN, LMG, SIP, SOR,

SMS
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
v • e

The Preconditioned Conjugate Gradient Method (PCG) package is one of the solver packages for MODFLOW supported by GMS.

Maximum outer iterations (MXITER)

This value is the maximum iterations, or calls to the solver. For linear problems, this value can be 1, unless more than 50 inner iterations are required, when maximum outer iterations could be as large as 10. For non linear problems, this values should be larger, but generally less than 100.

Maximum inner iterations (ITER1)

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.

Matrix Preconditioning Method (NPCOND)

Use this radio group to choose the matrix conditioning method. The default is to use a modified incomplete cholesky method.

Relaxation Parameter

This value is used if the modified incomplete cholesky method is used. Usually, this value is 1.0, but for some problems a value of 0.99, 0.98, or 0.97 will reduce the number of iterations required for convergence.

Head Change Criterion For Convergence

When the maximum absolute value of head change from all cells during an iteration is less than or equal to the head change criterion, AND the residual change criterion is met, solver iteration stops.

Residual Change Criterion For Convergence

When the maximum absolute value of residuals from all cells during an iteration is less than or equal to the residual change criterion, AND the head change criterion is met, solver iteration stops.

Relaxation parameter

The relaxation parameter used with Matrix Preconditioning Method.

Eigenvalue upper bound

Damping for all, or if <0, only SS stress periods

Damping for transient stress periods

Printout interval

Printing of convergence info

Reset

This button will change all options to the default state.

The MODFLOW PCG Package dialog.


v • e
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