SimScale CAE Forum

Modal analysis (by Calculix) - Not longer supported?


#1

Dear Simscale team,

Modal analysis to calculate the eigenfrequencies and eigenshapes of a structure is a very basic analysis type. Simscale used in the past the Calculix solver for this analysis type. Any background why such a fundamental analysis type (see https://www.simscale.com/blog/2016/12/what-is-modal-analysis/) is no longer supported by Simscale?

Thank you!


#3

Hi @dgiljohann!

Indeed this feature is not part of our modules inside SimScale anymore - it simply has not been used that often. If you are still interested in this feature and would like to have it back I would highly recommend to put your wish into the Vote For Features category.

If you have any questions feel free to post your thoughts down below or drop me a private message.

All the best!

Jousef


#4

Hi jousefm,

I created a detailed feature request:


In case Simscale decides to implement it again you may contact me for any testing of this or other acoustic/dynamic features. Thank you!


#5

Any update on whether modal analysis is coming back to SimScale? I created an account just for this type of analysis and am slightly disappointed that it is no longer available. I’ll have to give ANSYS Fluent a try.


#9

Hi @tsoares,

Let me tag my friend @jousefm who may be able to better address your question!

Cheers.

Regards,
Barry


#10

Hey there @tsoares!

We have no fixed date for the release but it is definitely on our roadmap so stay tuned :slight_smile: We will announce it in the new section as soon as possible.

Thanks for your patience and remain loyal :slight_smile:

Jousef


#11

Hello @jousefm
When will the modal analyis be released. Is there any tentative date. Or it is already available and I am less informed?

Thanks
Rahul


#13

Hi @rahul_reddy,
perfect timing, try to create a new simulation and check for the available analysis types :wink:
(Full release notes will follow on Monday)

Best,
Richard


#14

:+1::+1::+1::+1::+1:


#15

Hi @rszoeke and @jousefm,

I have not seen the release notes discussing this feature yet but I have tried it out a couple of times with some success.

One thing I have not figured out is how to display the deformed mode shapes. I am able to view the first mode but I can not find a way to show any other modes. Can you provide some guidance on showing the mode shapes?

Thanks,
Christopher


#16

Hi @cjquijano,
there is currently a limitation in the post-processor that you have to delete first the animation of the previous mode and then create a new one for the newly selected frequency. This might be the reason for your issue.

Can you check if it works for you as shown in this video: https://www.useloom.com/share/8051dafb8b07433caba62c05b866bdd7

Best,
Richard


#17

Thanks @rszoeke,

That helps although its not really intuitive. Any chance the modes can actually be labeled as “Modes” and not “Time”?

Christopher


#18

Any suggestions how to do acoustic analysis? Compressible unsteady flow?


#19

Hi @ngerasimov!

You can give the acoustic analysis feature request a vote here: Acoustic analysis .

Best,

Jousef


#20

I’ve done, but it’s not the task. I need to do calculations, is there any option for that or should I use another software
(which one)?


#21

Hi @ngerasimov!

In this case you have to use another software, either COMSOL or if you want to experiment with another approach use LBM (Lattice-Boltzmann Method) - give OpenLB a try.

Best,

Jousef