Culises  Acceleration potential
Exemplary results for external vehicle aerodynamics with simpleFoam
CPU: Intel® Xeon® E52650 (8 cores, clock speed 2 GHz, Sandy Bridge architecture with AVX support), linear solver: GAMG
GPUs: NVIDIA® Tesla® K40, linear solver: AMG preconditioned CG
Benchmark case from automotive OEM, 18 million grid cells, 200 SIMPLE iterations
Number of CPU cores 
8 
8 
8 
Number of GPUs 
0 
1 
2 
Time spent in linear solver [s] 
6819 
1770 
1264 
Total simulation time [s] 
13436 
8383 
7923 
Speedup of linear solver 

3.85 
5.39 
Speedup of total simulation 

1.60 
1.70 
Fraction of total simulation which is accelerated = linear solve time / total time 
0.51 


Generic DrivAer concept car model , 12.5 million grid cells, 100 SIMPLE iterations
Number of CPU cores 
8 
8 
8 
Number of GPUs 
0 
1 
2 
Time spent in linear solver [s] 
870 
429 
292 
Total simulation time [s] 
2327 
1889 
1749 
Speedup of linear solver 

2.03 
2.98 
Speedup of total simulation 

1.23 
1.33 
Fraction of total simulation which is accelerated = linear solve time / total time 
0.37 

