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Employee
yannick.moret
Posts: 115
Registered: ‎04-28-2009

Re: TIME TO COMPLETE COOLING ANALYSIS

08-29-2011 06:57 AM in reply to: HugoHerrera7042

@Hugo

See previous answer, check that coo;l is running using 1 full CPU. If not, you are just lacking RAM....

If the analysis ran fast till it seems to stop, then best would be to contact support.

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Employee
yannick.moret
Posts: 115
Registered: ‎04-28-2009

Re: TIME TO COMPLETE COOLING ANALYSIS

08-29-2011 07:00 AM in reply to: tobi_cologne

@tobi_cologne

Flow anlaysis is another story (my ram comment apply only for cool).

10 hours can be noraml depending of the size of the model, if you have fiber or not, if you have very long cycle time, if you are close to short shot condition which will lead to convergence difficulties...

Difficult to diagnose without the model.

 

Did you try the latest scnadium lab release with parallelization for midplane and dual domain ?

That would be reallyhelpful if your model has a big number of elements.

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Contributor
piotr.wozniacki
Posts: 25
Registered: ‎07-20-2011

Re: TIME TO COMPLETE COOLING ANALYSIS

08-29-2011 07:09 AM in reply to: yannick.moret

Hi Yannick,

 

I'd also think swap file trashing is the culprit, but please read my post above (here I copy it for you convenience):

 

I have a very fast computer with 16GB RAM, and yet the second phase of Cool (FEM) 3D anaysis does take enormous emount of time to complete.

 

Even though the entire sequence is parallelized, and I check the option for using max number of threads - and all 8 threads are reported to be in use - only  the first phase of the Cool (FEM) 3D snalysis can tax my fasy i7 extreme CPU up to 100% for all 8 threads. The second phase - transient within cycle - only uses some 15-18% - and this is not due to low memory and swap file trashing!

 

Just why is that, and what's the bottleneck?



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Employee
yannick.moret
Posts: 115
Registered: ‎04-28-2009

Re: TIME TO COMPLETE COOLING ANALYSIS

08-29-2011 07:10 AM in reply to: piotr.wozniacki

If you have doubt, contact support.

I ran big analysis on cool transient, and saw good performance on it.

It is difficult to do magic reply without model etc...

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Contributor
piotr.wozniacki
Posts: 25
Registered: ‎07-20-2011

Re: TIME TO COMPLETE COOLING ANALYSIS

08-29-2011 07:43 AM in reply to: yannick.moret

I did, and just got the confirmation that

 

 

"A Specialist will be assigned to work on your case and will be sending you a status update shortly"

 

Thanks, Autodesk!

 

Piotr

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New Member
tobi_cologne
Posts: 2
Registered: ‎08-19-2011

Re: TIME TO COMPLETE COOLING ANALYSIS

08-30-2011 04:43 AM in reply to: yannick.moret

Hello Yannik,

 

thanks for your reply. In the meantime I contacted support and first of all they told me to install service pack 2 because of the bug with getting several times the message "analysis complete". It took just one week to get this update installed :smileywink: (unfornately this is normal in my company...).

 

We ran my analysis meanwhile on another machine with Xeon 4 x 3,2 Ghz and 12 gb ram (same machine like mine) on AMI2011 and there the analysis (3D, 4,35 mil. elements, cool+fill+pack+warp) took about 3,5 days. But I think this is normal with that high number of elements and too less ram.

 

I'm trying to get an upgrade from 12 gb to 24 or even 36 gb, but at this stage I'll just have to find out a reasonable number of elements (referred to big parts) for getting good results, but without waiting 3 days. :-)

 

I'll also try out new features for faster analysis.

 

 

Best regards,

 

tobi_cologne 

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Mentor
madhukeshwart
Posts: 267
Registered: ‎03-18-2009

Re: TIME TO COMPLETE COOLING ANALYSIS

05-12-2014 03:22 AM in reply to: tobi_cologne

Any conclusion on this issue..

======================

 

The Time taken for cooling analysis is more than 3 days for 14 lac elements of 3D tetra with BEM method.

i.e mean it is not cool (FEM), running with mold boundry.

 

If RAM size is small, how to speed up the results without compromising tolerance ?

 

Did any one got satisfying answer on the same?

Madhukeshwar Talwar
FIAT-CHRYSLER ATC, Chennai
mail: madhukeshwart@gmail.com
09600060862
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