GMS:PCGN Package

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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

The PCGN package or Preconditioned Conjugate Gradient Solver with Improved Nonlinear Control is one of the solvers available for MODFLOW-2005. Using the PCGN solver a specific GMS MODFLOW executable (mf2k5_..._parallel.exe) can be run with parallel processing on a single machine (though not across multiple machines on a network) greatly reducing runtime.

The MODFLOW PCGN Solver dialog has the following options:

  • Comments (Text)
  • Max number of outer iterations (ITER_MO)
  • Max number of inner iterations (ITER_MI)
  • Head change criterion for convergence (CLOSE_R)
  • Residual criterion for convergence (CLOSE_H)
  • Relaxation parameter (RELAX)
  • Preconditioner fill level (IFILL)
  • Damping mode (ADAMP)
  • Damping restriction (DAMP)
  • Damping bound (DAMP_LB)
  • Rate (RATE_D)
  • Maximum head change (CHGLIMIT)
  • Convergence mode (ACNVG)
  • Minimum relative convergence (CNVG_LB)
  • Relative convergence increase power (MCNVG)
  • Relative convergence enhancement (RATE_C)
  • Progress reporting (IPUNIT)

For more information on this solver see the USGS documentation at http://water.usgs.gov/nrp/gwsoftware/modflow2000/MFDOC/pcgn.htm

The MODFLOW PCGN Solver package dialog.