GMS Now Includes Support for the PCGN Solver

GMS 9.0 includes support for the PCGN solver (Preconditioned Conjugate Gradient Solver with Improved Nonlinear Control).  The PCGN solver is included in MODFLOW-2005.  The PCGN solver was created to provide more options for models with poorly converging non-linear problems.  A detailed description of recommended PCGN input values can be found in the USGS Online Guide to MODFLOW.

The PCGN solver has been parallelized and can result in faster model runs for large models when the MODFLOW Parallel preference is enabled in the GMS Preferences dialog.