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Static Simulation does not run.

Question asked by Ryan Hader on Mar 9, 2015
Latest reply on Mar 10, 2015 by Jared Conway

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Can Someone help indicate what I have done wrong with this model??

It is a simple model which is a shell / cover and I want to fix the base end of it and apply a load to exterior surface. Should really be pretty simple. But every time I attempt to run the simulation it comes up with an error saying that 'no restraints defined' and when I select the base face of the model (the only flat face) at first it accepts the selection however once you attempt to run the simulation an error comes up within the 'Fixtures' selection and it will not allow you to select the face that needs to be fixed and comes up with a 'select entity on shell' error.

It meshes well and I have done a couple of similar models that do run the simulation like this so I am unsure why this one will not??

Please help.

Attilio Colangelo Mar 9, 2015 9:35 AM

Correct Answer

There is a combination of surfaces and solids getting in each other's way. I suppressed the "Surface-knit1" feature which seems to not effect the geometry but leaves a single solid body. This body meshes and solves good,

However, I recommend building a surface-revolve for the entire part. This will make for a simpler geometry and shells (as opposed to solids) in FEA mode would be more accurate for this geometry.

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Fized Shell for Static Load Study.zip443.1 KB

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Attilio Colangelo Mar 9, 2015 9:35 AM

However, I recommend building a surface-revolve for the entire part. This will make for a simpler geometry and shells (as opposed to solids) in FEA mode would be more accurate for this geometry.

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Ryan Hader @ Attilio Colangelo on Mar 9, 2015 9:54 AM

Thank you for the suggestion.

I tried suppressing the 'Surface-knit1' feature - however it still seems to not want to run for me and comes up with the same error...?

DO you mind sending me the file that you ran to see what you have changed??

And yes I agree using the 'revolve' feature would be better and I was trying to come up with a way to do that as this shell is not completely symmetrical it is difficult to define an axis.

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Ryan Hader @ Ryan Hader on Mar 9, 2015 9:57 AM

I am still getting this error when I select the face to be fixed:

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Attilio Colangelo @ Ryan Hader on Mar 9, 2015 10:05 AM

Yes, I was getting the same error before making changes. See attached model "Static4". "Surface-Knit1" needs to be suppressed/rolled back.

Attachments

StaticStressAnalysis.zip15.5 MB

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Ryan Hader @ Attilio Colangelo on Mar 9, 2015 10:22 AM

Thanks for that!

Interesting - I had done the same thing but I had not started a 'new study'..

It would appear that you have begin a new study to have such changes take affect??

Thanks for the help. It would appear that I did not require the 'Surface Knit' feature at all? I was assuming it was needed to merge the two entities together but it would appear that is not the case?

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Attilio Colangelo @ Ryan Hader on Mar 9, 2015 10:50 AM

When studies "go bad" they almost always have residue even after fixing/making changes. Some combination of creating a new study, copying the part to a different directory, deleting existing Simulation databases will allow the model to refresh.

Unfortunately this is not something that you will find in typical documentation for any software.

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Ryan Hader @ Attilio Colangelo on Mar 9, 2015 11:28 AM

Well thanks again. I spent several hours trying different things last night and did not always attempt restarting a new solution.... SO I learned a couple of things today.

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Attilio Colangelo @ Ryan Hader on Mar 9, 2015 2:28 PM

No problem. Can you mark this as "answered", or "correct answer", (not sure how this forum works in that regard).

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Ryan Hader @ Attilio Colangelo on Mar 9, 2015 2:31 PM

indicated answered to your original corrective post.

Cheers.

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Attilio Colangelo @ Ryan Hader on Mar 9, 2015 2:49 PM

Thanks. I saw that but it appeared one of your questions was marked as "correct answer" as opposed to my answer. I'm new to this forum so not sure how that part works. Thanks!

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Jared Conway @ Attilio Colangelo on Mar 10, 2015 2:40 PM

you could also exclude at the study level instead of suppress/unsuppress

and sometimes "updated all components" will fix the issue you describe

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Attilio Colangelo Mar 9, 2015 9:35 AM
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Correct Answer
There is a combination of surfaces and solids getting in each other's way. I suppressed the "Surface-knit1" feature which seems to not effect the geometry but leaves a single solid body. This body meshes and solves good,

However, I recommend building a surface-revolve for the entire part. This will make for a simpler geometry and shells (as opposed to solids) in FEA mode would be more accurate for this geometry.
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- Ryan Hader @ Attilio Colangelo on Mar 9, 2015 9:54 AM
  Mark Correct
  Correct Answer
  Thank you for the suggestion.
  
  I tried suppressing the 'Surface-knit1' feature - however it still seems to not want to run for me and comes up with the same error...?
  
  DO you mind sending me the file that you ran to see what you have changed??
  
  And yes I agree using the 'revolve' feature would be better and I was trying to come up with a way to do that as this shell is not completely symmetrical it is difficult to define an axis.
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  - Ryan Hader @ Ryan Hader on Mar 9, 2015 9:57 AM
    Mark Correct
    Correct Answer
    I am still getting this error when I select the face to be fixed:
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    - Attilio Colangelo @ Ryan Hader on Mar 9, 2015 10:05 AM
      Mark Correct
      Correct Answer
      Yes, I was getting the same error before making changes. See attached model "Static4". "Surface-Knit1" needs to be suppressed/rolled back.
      Attachments
      StaticStressAnalysis.zip15.5 MB
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      - Ryan Hader @ Attilio Colangelo on Mar 9, 2015 10:22 AM
        Mark Correct
        Correct Answer
        Thanks for that!
        Interesting - I had done the same thing but I had not started a 'new study'..
        
        It would appear that you have begin a new study to have such changes take affect??
        
        Thanks for the help. It would appear that I did not require the 'Surface Knit' feature at all? I was assuming it was needed to merge the two entities together but it would appear that is not the case?
        Like • Show 0 Likes0
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        Attilio Colangelo @ Ryan Hader on Mar 9, 2015 10:50 AM
        Mark Correct
        Correct Answer
        When studies "go bad" they almost always have residue even after fixing/making changes. Some combination of creating a new study, copying the part to a different directory, deleting existing Simulation databases will allow the model to refresh.
        
        Unfortunately this is not something that you will find in typical documentation for any software.
        Like • Show 1 Like1
        Actions
        Ryan Hader @ Attilio Colangelo on Mar 9, 2015 11:28 AM
        Mark Correct
        Correct Answer
        Well thanks again. I spent several hours trying different things last night and did not always attempt restarting a new solution.... SO I learned a couple of things today.
        Like • Show 0 Likes0
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        Attilio Colangelo @ Ryan Hader on Mar 9, 2015 2:28 PM
        Mark Correct
        Correct Answer
        No problem. Can you mark this as "answered", or "correct answer", (not sure how this forum works in that regard).
        Like • Show 1 Like1
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        Ryan Hader @ Attilio Colangelo on Mar 9, 2015 2:31 PM
        Mark Correct
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        indicated answered to your original corrective post.
        
        Cheers.
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        Attilio Colangelo @ Ryan Hader on Mar 9, 2015 2:49 PM
        Mark Correct
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        Thanks. I saw that but it appeared one of your questions was marked as "correct answer" as opposed to my answer. I'm new to this forum so not sure how that part works. Thanks!
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        Jared Conway @ Attilio Colangelo on Mar 10, 2015 2:40 PM
        Mark Correct
        Correct Answer
        you could also exclude at the study level instead of suppress/unsuppress
        
        and sometimes "updated all components" will fix the issue you describe
        Like • Show 0 Likes0
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Static Simulation does not run.

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