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Message 1 of 23
ramses061
919 Views, 22 Replies

Failed analysis

Hi,

I'm doing MES analysis in Multiphysics 2013 and during the analysis an error message appears and analysis stops.

The message is "error opening in output files"

Can someone explain this?

22 REPLIES 22
Message 2 of 23
PipePakPat
in reply to: ramses061

This type of problem is often model dependent or system dependent.  Please click the big "S" button in the top left of the interface and choose to create an archive of the model only.  Upload the resulting *.ach file for our review.  If the file to too large to upload, then you can open a case with product support through the Autodesk Subscription Center so that we can address this issue more appropriately.

Pat Tessaro, P.E.
Premium Support Specialist – Simulation

Autodesk, Inc.
6425 Living Place
Suite 100
Pittsburgh, PA 15206
Message 3 of 23
zhuangs
in reply to: ramses061

The error message is "error opening in output files" or  "restart failed in opening output files"?

 

It seems that I did not see "error opening in output files" previously.

 

 

Shoubing

Message 4 of 23
ramses061
in reply to: zhuangs

I copied the last part of the log here,

 

  Time        Percent     DT       L Iter. Residual   0.00000000E+00   0.0000     0.000400  1   0   0.0000E+00   4.00000000E-04   2.0000     0.000400  1   0   5.0000E-03   4.00000000E-04   2.0000     0.000400  1   1   5.0000E-03c   8.00000000E-04   4.0000     0.000400  1   0   5.0000E-03   8.00000000E-04   4.0000     0.000400  1   1   5.0000E-03c   1.20000000E-03   6.0000     0.000400  1   0   5.0000E-03   1.20000000E-03   6.0000     0.000400  1   1   5.0000E-03c   1.60000000E-03   8.0000     0.000400  1   0   5.0000E-03   1.60000000E-03   8.0000     0.000400  1   1   5.0000E-03c   2.00000000E-03  10.0000     0.000400  1   0   5.0000E-03   2.00000000E-03  10.0000     0.000400  1   1   5.0000E-03c    ** restart failed in opening output files    ** Error (1)  ** Job started           : 2012-06-22  19:13:01  ** Job finished          : 2012-06-22  19:48:03  ** Total elapsed time    : 35:2 (minutes:seconds)  !! Program aborted !

 

What does it mean?

Message 5 of 23
ramses061
in reply to: ramses061

Hi.

In my analysis a new error appeared. 

 

** Warning: element   3091 in part   7: determinant =-.55449449E-01<= DETTOL!

 

What does it mean?

Message 6 of 23
John_Holtz
in reply to: ramses061

That exact error message is not in the documentation, but the error message in the documentation that does include the word "determinant" indicates that the element is distorted.

 

When does this occur? Near time 0? Or after part 7 experiences large strain?

 

Note that you can locate the element from "Results Inquire > Element Information > Specify". This will select the element, so changing the "View > Appearance > Visual Style" to Features" will help to locate that one element.

 



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
Message 7 of 23
zhuangs
in reply to: ramses061

It seems that there is a temporary IO error.  Which version are you using?  Rerun the same model might get works.  Did you try it?

 

Shoubing 

 

 


ramses061 wrote:

 

I copied the last part of the log here,

 

  Time        Percent     DT       L Iter. Residual   0.00000000E+00   0.0000     0.000400  1   0   0.0000E+00   4.00000000E-04   2.0000     0.000400  1   0   5.0000E-03   4.00000000E-04   2.0000     0.000400  1   1   5.0000E-03c   8.00000000E-04   4.0000     0.000400  1   0   5.0000E-03   8.00000000E-04   4.0000     0.000400  1   1   5.0000E-03c   1.20000000E-03   6.0000     0.000400  1   0   5.0000E-03   1.20000000E-03   6.0000     0.000400  1   1   5.0000E-03c   1.60000000E-03   8.0000     0.000400  1   0   5.0000E-03   1.60000000E-03   8.0000     0.000400  1   1   5.0000E-03c   2.00000000E-03  10.0000     0.000400  1   0   5.0000E-03   2.00000000E-03  10.0000     0.000400  1   1   5.0000E-03c    ** restart failed in opening output files    ** Error (1)  ** Job started           : 2012-06-22  19:13:01  ** Job finished          : 2012-06-22  19:48:03  ** Total elapsed time    : 35:2 (minutes:seconds)  !! Program aborted !

 

What does it mean?


 

Message 8 of 23
ramses061
in reply to: zhuangs

I don't know how this is happen but now this error disappeared. I'm fighting with timesteps. My simulation always fails. I sent you the model. Could yo looked my new model? I sent you an invitation from my dropbox folder. My model always gives an autotm limit errors and i've  never be able to finish it. Please help me Smiley Frustrated

Message 9 of 23
zhuangs
in reply to: ramses061

What's the name of the model? 

Message 10 of 23
ramses061
in reply to: zhuangs

The folder's name is Zhuang. And the file's name is 22.06.2012-2.ach.

 

Message 11 of 23
zhuangs
in reply to: ramses061

I will investigate it today.  Thanks.

 

Shoubing

Message 12 of 23
ramses061
in reply to: zhuangs

I really thank you very much. I only want to take my results from start to the end. I attached here my load curve. I want the calculate the stresses at the spesific times.

Message 13 of 23
zhuangs
in reply to: ramses061

There is only one surface force in the model, and there is no constraint on he head.  Is it right?

 

Moreover, you don't want to consider 'Gravity", right?

 

Shoubing

Message 14 of 23
ramses061
in reply to: zhuangs

Yes. Only 1 surface load and no constraints on the head. I want to apply a dynamic force to the head. I attached the load curve. The force begins to hit at the time 0,00207 s. And i started to run the calculation at that time to decrease the simulation duration.

Message 15 of 23
ramses061
in reply to: ramses061

And i don't want to to consider gravity.

Message 16 of 23
zhuangs
in reply to: zhuangs

The warning message "** Warning: element   3091 in part   7: determinant =-.26223249E-01<= DETTOL!" is related to the bad element shape.  If the element shape is too bad at the very beginning,somehow some deformation will result in too small deternimant.  Actually, the mesh in part 6 and part 7 is not good.  Especially in the impact area.  Finer mesh for part 6 and part 7 is prefered.  However, even the current mesh size make the model too large for my computer to handle easily.  You might to enlarge the mesh size the other parts which is not so important.

 

Shoubing

Message 17 of 23
ramses061
in reply to: ramses061

Thanks for your interest,
But today i suppressed both parts 6 and 7 and i got the same error in parts 8 and 9. I think there is a convergence problem. The time steps are too small. I tried to set a constant time step but that time the program ended with no result.
Message 18 of 23
zhuangs
in reply to: ramses061

Well.  It seems that this kind of warning message happens after a convergent step, and the following step has a half step size.  In this case, the warning message might be related to the trial solution based on the the last convergent step.  And the code automatically cut time step.

 

Shoubing

Message 19 of 23
ramses061
in reply to: zhuangs

So what do you suggest?

Message 20 of 23
zhuangs
in reply to: ramses061

The model should be symmetric.  We can use a symmetric model with finer mesh to obtain better elemet shape and more stable running.

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