October 31, 2017 at 10:40 pmAhmedSubscriber
I recently downloaded Ansys Student 18.2 . I have been solving very basic fluid dynamics problems which may require 200 or 300 iterations at most to converge to the desired tolerance. However , my Ansys fluent software is working very slowly and is taking a lot of time to do the iterations. For instance to do 300 iterations it took close to one hour. My laptop has Intel Core i5 -2430M with 8GB Ram. A friend of mine who has the same processor on his laptop did the same problem on Ansys. He was able to do 300 iterations in 7.111s.
I would also like to mention that once when I started my laptop and opened Ansys Fluent; it worked properly. It performed all the solutions in a matter of seconds. However this was a one time occurrence; when I restarted my laptop ; Ansys Fluent went back to performing slowly.
I would be really grateful if someone could look into this matter.
November 1, 2017 at 9:41 amRaef.KobeissiSubscriberHello 300 iteration within 7 seconds under the specs you mentioned sounds impossible to me even if the model was 2D. Could you please provide a description of the model you were running.
I believe if the number of elelments is high in your model, an hour would make sense for 300 iterations on a PC similar to what you’ve described.
November 1, 2017 at 3:09 pmAhmedSubscriber
Thanks for your response.
I was running a simulation on a 2-D model with 4000 cells.I was simulating laminar flow in a channel. Since I just started using Ansys I mainly used default settings for all other other parameters except I just altered the inlet velocity magnitude. My tolerance specification was 10^-5 for velocity and momentum equations. My PC has Intel Core i5 -2430M with 8GB Ram and with in built graphic card ; Intel HD Graphics 3000.
Let me know if you any need any further information. Thanks.
November 1, 2017 at 5:38 pmAhmedSubscriber
I restarted my Laptop and opened Ansys Fluent. it worked properly this time. I performed 1000 iterations in 27 seconds. Later, I restarted my laptop and opened Ansys Fluent again and it went back to performing slowly. However this time I copied the messages that appeared in the console tab in both slow and fast cases. All the messages were same except the following.
Multicore SMT processors detected. Processor affinity set!
DESKTOP-621A36I is already loaded (23.9042%). Process affinity not being set.
I hope this helps you with your diagnosis.
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