Fluent is so slow (CPU consumption problem)

- August 7, 2020 at 9:12 am
  
  hussainalshaikh
  Subscriber
  
  I am using fluent to simulate and analyse a flow past a cylinder. My computer has 8 cores and 16 logical processors. When open fluent, I always run in parallel with 8 solver processes. However, the simulation run very slow and I don't get the speed I am expecting. The task manager always shows that 5-6% of the CPU consumed by cx2010 while each of the 7 fl_mpi2010 consume 10% of the CPU. I have another 2 cores laptop which shows that 25% is consumed by the cx2010 while only 2 fl_mpi2010 files consume 10% each. Whats going wrong here and how can I increase the speed of my runs?
- August 7, 2020 at 9:59 am
  
  DrAmine
  Ansys Employee
  
  Reduce cortex consumption and run in batch without GUI. Moreover do not use Hyperthreading (Turn it Off)n
- August 7, 2020 at 10:22 am
  
  Rob
  Forum Moderator
  
  Turn off Chrome & Edge too. Reboot and then restart the calculation. How many cells are in the model as I'd expect the parallel core use to be higher. n
- August 7, 2020 at 7:35 pm
  
  hussainalshaikh
  Subscriber
  
  Thanks DrAmine,nHow can I turn off hyperthreading?n
- August 7, 2020 at 7:37 pm
  
  hussainalshaikh
  Subscriber
  
  Thanks Rob, nThe model has 159352 node & 158592 elements. n