Learning Forum

[Nurs134]

 

Hello,

I am working on an oil platform. I have set up a share topology contact between the materials. I have set fixed support to the plate from the bottom side of the rings. I wanted to perform a modal analysis. But this simulation do not converge, maybe it is due to not enough stiff geometry or meshing issues. The model can be downloaded by this link. If you can solve this on your computer can you say how to do it?

 https://drive.google.com/open?id=12l4iQgfwbSrkrLfgOJAX6O4k50Br_LAz

[Sai Deogekar]

Hello,

Due to campany policies, Ansys employees cannot download any attachments or files. Could you attach some images and expand a bit more on the error message you are getting? What does the error message say? Does it suggest any corrections?

 

Sai 

[Nurs134]

The warning message are:

• ''The PCG Lanczos eigensolver has detected that element 1257666 has zero mass.  Please check the density material property (or alternative mass definition if appropriate) for this element.  You should check the solution carefully and if necessary you may want to either use a Lev_Diff value equal to 5 on the PCGOPT command or switch to the Block Lanczos eigensolver (MODOPT,LANB). ''


• ''Material number 6 (used by element 1257636) should normally have at least one MP or one TB type command associated with it.  The output of energy by the material may not be available.''

 

[Nurs134]

[Nurs134]

[Nurs134]

Maybe the error in step file? due to it is assembly

[rgarcia60]

Unfortunately I can't open your model since I'm using 2019 R1.

Did you add density to your materials used in engineering data? Forgetting to add density for modal analysis is a common mistake.