Janna/Emilia_923
geomechanical model for C02 sequestration
Name 
Emilia_923 
Group 
Janna 
Matrix ID 
2542 
Num Rows

923,136 
Num Cols

923,136 
Nonzeros

40,373,538 
Pattern Entries

41,005,206 
Kind

Structural Problem 
Symmetric

Yes 
Date

2011 
Author

C. Janna, M. Ferronato 
Editor

T. Davis 
Structural Rank 
923,136 
Structural Rank Full 
true 
Num Dmperm Blocks

14,425 
Strongly Connect Components

14,425 
Num Explicit Zeros

631,668 
Pattern Symmetry

100% 
Numeric Symmetry

100% 
Cholesky Candidate

yes 
Positive Definite

yes 
Type

real 
Download 
MATLAB
Rutherford Boeing
Matrix Market

Notes 
Authors: Carlo Janna and Massimiliano Ferronato
Symmetric Positive Definite Matrix
# equations: 923136
# nonzeroes: 41005206
Problem description: Geomechanical problem
The matrix Emilia_923 is obtained from a structural problem
discretizing a gas reservoir with tetrahedral Finite Elements.
Due to the complex geometry of the geological formation it was
not possible to obtain a computational grid characterized by
regularly shaped elements. The problem arises from a 3D
discretization with three displacement unknowns associated to
each node of the grid. Some further information may be found in
the following papers:
1) M. Ferronato, G. Gambolati, C. Janna, P. Teatini.
"Geomechanical issues of anthropogenic CO2 sequestration in
exploited gas fields", Energy Conversion and Management, 51, pp.
19181928, 2010.
2) C. Janna, M. Ferronato. "Adaptive pattern research for block
FSAI preconditionig". SIAM Journal on Scientific Computing, to
appear.
