USGS

Preconditioned Conjugate Gradient 2 (PCG2), A Computer Program for Solving Ground-Water Flow Equations

U.S. Geological Survey, Water-Resources Investigations Report 90-4048

by Mary C. Hill


Table of Contents

Abstract

Introduction

Purpose and scope

Previous investigations

Three-dimensional ground-water flow model

Solution by the preconditioned conjugate-gradient method

MICCG

POLCG

Convergence criteria

Input instructions

Sample data inputs

Linking PCG2 to the modular model

Documentation of PCG2

Brief description of modules

Flowchart

Narratives for modules

PCG2AL

PCG2RP

PCG2AP

SPCG2P

SPCG2E

Adapting SPCG2E for computers with vector and parallel

architecture

List of variables

References

Fortran listing

PCG2AL

PCG2RP

PCG2AP

SPCG2P

SPCG2E

 


 

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