Reference Guide

ANSYS CFX Performance
14 Dell EMC Ready Solutions for HPC Digital Manufacturing with AMD EPYC™ Processors—ANSYS®
Performance
4 ANSYS CFX Performance
ANSYS CFX software is a computational fluid dynamics (CFD) application recognized for its accuracy,
robustness and speed with rotating machinery applications. CFD applications typically scale well across
multiple processor cores and servers, have modest memory capacity requirements, and typically perform
minimal disk I/O while in the solver section. However, some simulations may have greater I/O demands, such
as transient analysis. Figure 4 shows the measured performance of the standard CFX benchmarks using CFX
2019R3 on a single server. The performance for each benchmark is measured using the solver elapsed time.
Figure 4 Single Server Relative Performance—ANSYS CFX
The results presented in Figure 4 are single-server performance results, with the benchmark run using all
processor cores available in the server. The results are plotted relative to the performance of a single server
configured with AMD EPYC 7601 processors. A larger value indicates better performance. These results
show the performance advantage available with AMD EPYC 7002 series processors. The 32-core AMD
EPYC 7452 and 7502 processors provide very good performance for these benchmarks. The 64-core AMD
EPYC 7702 provides a significant performance advantage over the 32-core processors, particularly for the
LeMans and Pump benchmark cases. This may be due to the larger L3 cache provided by the 7702. The
effect of cache can be significant, and the relative performance may change as more servers are used and
more of the data is contained in cache. Because of this behavior, the relative performance of the various
processor models depends on the specific benchmark case and the number of servers used for the
simulation.
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
Airfoil_10M Airfoil_50M Airfoil_100M LeMans Pump
Performance Relative to AMD EPYC 7601
Single Server Relative Performance—ANSYS CFX 2019R3
AMD EPYC 7601 AMD EPYC 7402 AMD EPYC 7452 AMD EPYC 7502 AMD EPYC 7702