Fluent 19.2 Slow After Scheduled Reboot
 

My Windows 10 office machine had a scheduled reboot over the weekend that updated McAfee Antivirus among other things. Since then, ANSYS Fluent 19.2 has been running really slowly. It visibly solves slower (slow iterations and cores dropping to ~0% usage between time steps though no data files are being saved), and even the GUI menus seem to hang up and be sized incorrectly.

ANSYS Fluent 18.2 on the same machine shows no issues. I ran a steady-state flat plate model in serial on both versions and it ran ~20-100 times faster in 18.2. Both were launched from Workbench (Workbench and other 19.2 programs such as Mechanical seem fine).

I assume antivirus is the issue, but am not positive. Does anyone know what specifically could be causing the issue (firewall, scratch files are being scanned upon creation, etc.)? We have a system admin so it is difficult to do lots of tests. Thank you.

Hi Joshua,

I had the same issue some time ago except that I was running Windows 7. This is what I did to resolve the slow down. I installed the latest Windows updates and also updated the drivers on the video card. After a restart, the above steps fixed the issue for me.

Hope this helps

Pramod,

Thank you for the response. Unfortunately I do not admin access to do either of those things, but once I hear back from IT I will see if they can at least update the video cards.

Unfortunately, since only a few programs updated since Fluent was functioning properly, I have a feeling the drivers and Windows are not the issue. Did your slow down start happening suddenly? Thank you.

I was seeing abnormal slow behavior with respect to meshing. The model meshed in under 10 minutes at ANSYS Support office whereas the same model was taking 50 minutes in my Workstation. The hardware was better in my Workstation. ANSYS could not figure out a reason as the issue could not be replicated at their computers. So, it was determined that the slowdown was machine specific.

I upgraded to Windows 10 and the problem went away. I think it was one of the programs installed on Windows causing the slowdown.

Solution Found
 

Pramod,

It turns out that the program "Endpoint Security Platform" from McAfee was causing the issue. Uninstalling that fixed it. I suspect you are right about some specific program causing you a slowdown previously. Thanks for the input.