GMS:PCGN Package: Difference between revisions
From XMS Wiki
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
{{MODFLOW Links}} | {{MODFLOW Links}} | ||
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 | 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 run time. | ||
The ''MODFLOW PCGN Solver'' dialog has the following options: | The ''MODFLOW PCGN Solver'' dialog has the following options: | ||
* ''Comments (Text)'' – Allows up to 199 characters. | * ''Comments (Text)'' – Allows up to 199 characters. | ||
* Max number of outer iterations (ITER_MO) | * ''Max number of outer iterations (ITER_MO)'' – For nonlinear problems, this variable must be set to some number greater than one, depending on the problem size and degree of nonlinearity. If set to 1, then the solver assumes that the problem is linear and the input requirements are greatly truncated. | ||
* Max number of inner iterations (ITER_MI) | * Max number of inner iterations (ITER_MI) | ||
* Head change criterion for convergence (CLOSE_R) | * ''Head change criterion for convergence (CLOSE_R)'' – If set to 1 then the problem will be linear. If set to be greater than 1 then it will be a nonlinear problem. | ||
* Residual criterion for convergence (CLOSE_H) | * ''Residual criterion for convergence (CLOSE_H)'' – Used as an alternate stopping criterion for the Picard iteration needed to solve a nonlinear problem. | ||
* Relaxation parameter (RELAX) | * Relaxation parameter (RELAX) | ||
* Preconditioner fill level (IFILL) | * Preconditioner fill level (IFILL) | ||
