Um/2cubes_sphere
FEM, electromagnetics, 2 cubes in a sphere. Evan Um, Geophysics, Stanford
Name 
2cubes_sphere 
Group 
Um 
Matrix ID 
1919 
Num Rows

101,492 
Num Cols

101,492 
Nonzeros

1,647,264 
Pattern Entries

1,647,264 
Kind

Electromagnetics Problem 
Symmetric

Yes 
Date

2008 
Author

E. Um 
Editor

T. Davis 
Structural Rank 
101,492 
Structural Rank Full 
true 
Num Dmperm Blocks

1 
Strongly Connect Components

1 
Num Explicit Zeros

0 
Pattern Symmetry

100% 
Numeric Symmetry

100% 
Cholesky Candidate

yes 
Positive Definite

yes 
Type

real 
Download 
MATLAB
Rutherford Boeing
Matrix Market

Notes 
A matrix from Evan Um, Geophysics, Stanford. Studying finiteelement
time domain solvers for electromagnetic diffusion equations. The 3D
computational domain consists of 88,213 tetrahedral elements. The
computational domain consists of the two parts. First, there are two
300m x 300m x 150m boxes where a fine mesh is used. Second, the two
boxes are enclosed by a large sphere whose radius is 10 km. An element
growth factor is used to increase the mesh size gradually inside the
sphere. This is because absorbing boundary conditions are not very
good choices for these problems. The finite element technique is
edgebased rather than nodebased. Therefore, the unknowns are
amplitudes of electromagnetic fields on an edge of each element.
