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Solvers

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VMOD 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 VMOD 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. Each new model using MODFLOW-96 or MODFLOW-2000 will be set to use the WHS Solver by default.