Visual MODFLOW Flex comes with a choice of different solvers to use in solving the numerical equations for the flow simulation:

•Preconditioned Conjugate-Gradient Package (PCG2)

•Strongly Implicit Procedure Package (SIP)

•Slice-Successive Overrelaxation Package (SOR)

•WHS Solver for VMOD Flex (WHS)

•Geometric Multigrid Solver (GMG)

•Algebraic Multigrid Methods for Systems (SAMG) and Algebraic Multigrid Solver (AMG) (only available with MODFLOW-2000, 2005 and MODFLOW-LGR)

These solvers and their individual settings can be accessed by selecting MODFLOW/Solver from the Run section of Visual MODFLOW Flex. A Solver Setting window will appear, similar to the image shown in the following figure, with a list for choosing the desired Solver and a listing of the settings for the selected Solver.

Note: the SAMG solver is available in the editions of Visual MODFLOW Flex as follows:

•Basic Edition: not available

•Professional Edition: SAMG - single core only

•Premium Edition: SAMG - multi-core/parallel processing

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