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Navigation: Online Guide to MODFLOW > Groundwater Flow Process > Solvers

LMG - Link-AMG Package

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Abbreviation in Name file

LMG

Purpose

The Link-AMG package is used to solve the finite difference equations in each step of a MODFLOW stress period.

Documentation

Mehl, S.W., and Hill, M.C., 2001, MODFLOW-2000, The U.S. Geological Survey Modular Ground-Water Model - User Guide to the Link-AMG (LMG) Package for Solving Matrix Equations Using an Algebraic Multigrid Solver: U.S. Geological Survey Open-File Report 01-177, 33 p.

Related Packages

Solvers

Supported in

MODFLOW-2000 (see below)

Other Notes

Unfortunately, due to licensing restrictions, the USGS is no longer able to publicly distribute the Algebraic Multi-Grid (AMG) solver, on which the Link-AMG (LMG) Package relies. USGS users can download a version of Modflow-2000 that includes AMG from a restricted web site (please contact Ned Banta or Arlen Harbaugh for the URL). Users outside the USGS can request the code directly from Dr. Klaus Stuben of Fraunhofer-Institute for Algorithms and Scientific Computing (SCAI), Sankt Augustin, Germany, at amg1r5@scai.fraunhofer.de.

If the Lake package is used, more iterations may be required.

Input Instructions

The LMG Package reads its input data from the file indicated in the Name file as described by Harbaugh and others (2000, p. 7, 43) using File Type LMG. Input for the LMG Package is defined using two numbered items. Each item consists of several parameters that are specified in one record and are read free format.

Data Set 1

STOR1 STOR2 STOR3 ICG

Data Set 2

MXITER MXCYC BCLOSE DAMP IOUTAMG

Data Set 3

DUP DLOW

Item 3 is read if DAMP = -2