Download postscript and pdf versions of manual plus all FORTRAN
programs. Cover picture: Showing, for a horizontal applied
field, the horizontal currents around a circular inclusion of
conductivity 10, embedded in a matrix of conductivity one,
computed using a finite difference program. The magnitude of the
currents go from red = high to black = low. This manual has been
prepared to show some of the theory behind, and the practical
details for using, various finite element and finite difference
computer programs that have been developed for computing the
effective linear properties of random materials whose
microstructure has been stored in a 2-D or 3-D digital image.
Thirteen different computer programs are described, including
finite element conductivity and elastic programs, finite
difference programs for D.C. and A.C. conductivity, finite
element elastic programs that include thermal strains
(eigenstrains), and three auxiliary programs for Gaussian
quadrature and phase percolation. All the programs are wr