Janna/Queen_4147: 3D structural problem
Authors: Carlo Janna and Massimiliano Ferronato
Symmetric Positive Definite Matrix
# equations: 4,147,110
# non-zeroes: 329,499,288
The matrix Queen_4147 is obtained from the 3D discretizaion
of a structural problem by isoparametric hexahedral Finite
Elements. The solid material is strongly heterogeneous and
several elements exhibit shape distortion thus producing an
ill-conditioned stiffness matrix.
Further information may be found in the following paper:
1) C. Janna, M. Ferronato, G. Gambolati. "The use of supernodes
in factored sparse approximate inverse preconditioning". SIAM
Journal on Scientific Computing, submitted.