The PCG2 package is one of four solver packages for MODFLOW supported by GMS. The others include the LMG (default), SSOR, and SIP packages.
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.
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.
Use this radio group to choose the matrix conditioning method. The default is to use a modified incomplete cholesky method.
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.
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.
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.
This button will change all options to the default state.
Related Links:
Packages Supported by GMS
Building a MODFLOW Model