Learning Forum

[neyret]

Hello,

I am running a response spectrum analysis with CQC mode combination. The prerequisite modal analysis is running normally, the response spectrum starts to solve but stops a bit later.

There are no errors in the solver output file, the resolution stops just after the CQC mode combination file has been written. The only displayed error in mechanical when trying to evaluate results (such as maximum equivalent stress map) is : "Requested results are not available". However stress and nodal forces are well activated in the solver outputs of modal analysis. A .rst file is written in the solver file, but it is impossible to load the stress contour.

Do you see which kind of settings and/or resource limitation could explain this behaviour ?

[Akshat Gupta]

Hello,

With the CQC method, are you giving any damping values?

What happens when you give the ROSE or SRSS method?

Do you see a normal termination in the Solver output?

Best,

Akshat

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[neyret]

Hello Akshat, thanks for your answer,

I've put a 4% damping ratio for CQC method.

I've tried both SRSS and ROSE method: I'm facing the same issue. 

There is not a normal termination in the solver output (no end MAPDL statistics for instance showing that run has completed). Instead, the solver stops just after writing the .mcom file for mode combination.

There is a green tick for solution information of the response spectrum analysis in Mechanical, but not for the requested results.

Thanks for your help,

Best regards

[Akshat Gupta]

Hello,

Are you using SMP or DMP?

Best,

Akshat

[neyret]

Hello,

I am using SMP, but if I remember well I also tried DMP and that didn't solve my issue.

Best regards,

Barnabé

[Akshat Gupta]

Hello Barnabé,

Can you try once with DMP with a different number of cores?

You will have to re-run modal also in this case.

Please let me know.

Thanks,

Akshat

[neyret]

Hi again Akshat,

It seems that it works now, thank you very much: I've decreased the nb of cores from 6 to 4 and response spectrum now finishes as it should.

Thanks a lot for your help ! I appreciate

Best regards,

Barnabé

[Akshat Gupta]

Hello Barnabé,

Thanks for the update.

I am happy to help.

Best,

Akshat