Learning Forum

[Brandon Schroder]

Hi,

I've recently updated from 2022 R1 to 2024 R1 and I've noticed that CFX's solver has become considerably slower in terms of starting, solving and saving a simulation. For example, a simulation of a domain with 200k cells takes 5 minutes to perform 3 iterations and thats with 36 cores. Have there been any changes to the default settings in CFX PRE that I might be unaware of that may have caused this? If not could someone please assist in troubleshooting. 

[CFD_Friend]

Hi Brandon,

Can you go through the material and see if this helps?

17.4. Advice on Using Ansys CFX in Parallel

Chapter 17: Using the Solver in Parallel (ansys.com)

[Brandon Schroder]

Thanks for the speedy response, much appreciated.

Serial calculation's wall clock shows 2.253 sec, and 36 core parallel is 1.368 sec equating to an efficiency of 4.57% so something is definitely wrong with the setup, which is strange since I had no issues with 2022 R1 and Fluent 2024 R1 seems to be doing just fine in parallel. I'll carry on going through the documentation you've listed.