Civil Engineering Reference
In-Depth Information
nels nxe nze nip
8000 20 20 8
aa bb cc
0.5 0.5 0.5
visc rho tol limit
0.01 1.0 0.001 30
cjtol cjits penalty
1.0e-5 500 1.0e5
x0 ell kappa
1.0 4 0.0
Figure 12.26
Data for Program 12.6 example
This job ran on 16 processors
There are 35721 nodes 28862 restrained and 96078 equations
Time after setup is : 0.900000000037834980E-01
Norm of the error is : 0.1533E+03
It took BiCGSTAB(L) 165 iterations to converge
Norm of the error is : 0.3581E+02
It took BiCGSTAB(L) 151 iterations to converge
Norm of the error is : 0.8611E+01
It took BiCGSTAB(L) 146 iterations to converge
.
.
.
Norm of the error is : 0.1296E+00
It took BiCGSTAB(L) 155 iterations to converge
Norm of the error is : 0.7125E-01
It took BiCGSTAB(L) 149 iterations to converge
The pressure at the corner of the box is :
Freedom Pressure
481 0.1110E+01
The total number of BiCGStab iterations was : 1384
The solution took 9 iterations to converge
This analysis took : 1153.42000000000553
Figure 12.27
Results from Program 12.6 example
Elements
Iterations to
convergence
512 672
1,000 713
1,728 900
8,000 1,385
64,000 2,508
125,000 3,313
Figure 12.28
Problem size vs. Number of iterations: Program 12.6 (SGI Origin 3000)
can be traced clearly between the two versions. In parallel, only the pressure at the corner
of the box is printed. Data are listed as Figure 12.26 with results as Figure 12.27. The
effect of problem size on the number of iterations to convergence is shown in Figure 12.28
and some performance statistics are listed in Figure 12.29. Speed-up versus number of
processors for larger data sets are shown in Figure 12.30. Post processing of results is now
critical and a typical display is shown as Figure 12.31.
