FS 680 2: Chemical kinetics problems RCHEM radiation chemistry study -- 2dn output time step
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Mixed kinetics diffusion problem from radiation chemistry. 17 chemical species and one space dimension with 40 mesh points. The diffusion terms are large compared with the kinetics terms. However, 440 columns are identically those of the unit matrix which possibly provides a good test for methods which cannot exploit such a feature properly (for example, methods which assume symmetry).

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Size
Type
680 x 680, 2646 entries
real unsymmetric
Nonzeros
total diagonal below diagonal above diagonal A-A' 2424 680 1222 522 2526

Column Data
Row Data
Average nonzeros per column : 3.6 Standard deviation : 3.8

index nonzeros longest 2 13 shortest 201 1

Average nonzeros per row : 3.6 Standard deviation : 2.1

index nonzeros longest 162 8 shortest 40 1

Bandwidths
Profile Storage
lower 561 upper 281 average |i-j| 1.1e+02 std.dev. 1.5e+02

min max ave. std.dev. lower bandwidth 0 560 1.9e+02 1.9e+02 upper bandwidth 0 280 34 70

Nonsymmetric skyline storage 154785

Heaviest diagonals
offset from main 0 1 -1 -120 -40 -80 -160 120 -200 -400
nonzeros 680 234 229 153 147 113 112 107 79 78
accumulated percent 28.05 37.71 47.15 53.47 59.53 64.19 68.81 73.23 76.49 79.70

Top 10 out of 20 nonvoid diagonals.
Conditioning
Frobenius norm 1.2e+14 condition number (est.) 1.4e+05 2-norm (est.) 7.2e+13 diagonal dominance no

Set Information
Set FACSIMILE
Source:
Alan Curtis, Computer Science and Systems Division, AERE Harwell.
Discipline: Chemical kinetics
Accession: August 1983

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Last change in this page: Wed Sep 22 13:33:38 US/Eastern 2004
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