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CFX 2024 R1 Solver Slow

- February 1, 2024 at 9:57 am
  
  bs
  Subscriber
  
  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.
- February 1, 2024 at 11:53 am
  
  V.P
  Ansys Employee
  
  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)
- February 1, 2024 at 12:24 pm
  
  bs
  Subscriber
  
  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.

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