Element quality check

Altair Forum User

 I am working on composite analysis using optistruct solver. While solving I got error 'program stopped due to element quality check.' what should be the solution for this. whether I have to remesh again or is there any command by which element quality criterion gets automatically satisfied.

   Thanks.

Altair Forum User

Hi Bhushan,

 

You can Bypass the element quality check. Use the control card CHECKEL>>NO

 

Goto Analysis>> Control Cards>>PARAM>>CHECKEL>>NO

Altair Forum User

Hi prakash,

     Still same error is occurring. I am attaching here snapshot from .out file. please check it and reply what may be the problem. 

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi Bhushan,

 

Are you running any optimization on your model?

 

 

Altair Forum User

Hi prakash,

   In optistruct solving button I am keeping run option to analysis. Is it optimization?

Altair Forum User

No, if you are using Analysis, optimization will be skipped.

 

Can you share the model file?

 

Use this File Transfer LINK

 

Altair Forum User

Sorry I can not share model because of security issue.

Altair Forum User

Bhushan,

 

OK. Since the problem is only with 2 elements, try to delete those elements and recreate again.

 

After recreating check if the problem is solved,

Altair Forum User

Hi prakash,

  Do you know how to find out element with highest warp angle and vertex angle.

Rahul Rajan_21763

Altair Forum User said:

Hi prakash,

  Do you know how to find out element with highest warp angle and vertex angle.

Check with element id.

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Altair Forum User said:

No, if you are using Analysis, optimization will be skipped.

 

Can you share the model file?

 

Use this File Transfer LINK

 

I'm using optimization and it didn't skipped. How to skip this iteration and continue when occurs error 'program stopped due to element quality check.'？

Altair Forum User

Hi @wangs8811

 

What type of optimization is it?

 

Is this happening in between the iterations or at the beginning of optimization?

 

could you please share the .out file?

Altair Forum User

Altair Forum User said:

Hi @wangs8811

 

What type of optimization is it?

 

Is this happening in between the iterations or at the beginning of optimization?

 

could you please share the .out file?

Thanks for replying and Happy new year！

I'm using the free shape optimization. It  happened between the  iterations.

 

 

Some of the .out  is as below:

==================================

 OPTIMIZATION HAS CONVERGED.

 FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED).

 THE GLOBAL SEARCH OPTION FOUND A NEW UNIQUE DESIGN.
 THIS IS ALSO THE BEST DESIGN SO FAR.

 OPTIMIZATION HAS CONVERGED.

 FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED).

 THE GLOBAL SEARCH OPTION DID NOT FIND A NEW UNIQUE DESIGN.
 THIS DESIGN HAS BEEN FOUND 2 TIMES SO FAR.

 Element # 3473, element type QUAD4.

 *** PROGRAM STOPPED: ERRORS DURING ELEMENT QUALITY CHECK.

************************************************************************

 A fatal error has occurred during computations:

  *** PROGRAM STOPPED: ERRORS DURING ELEMENT QUALITY CHECK.

************************************************************************

 ==== End of solver screen output ==== 

 ==== Job completed ==== 

===================================

Altair Forum User

Prakash Pagadala

Altair Forum User

Hi @wangs8811

 

 

Include REMESH option on DOPTPRM. Goto OptiControls>> REMESH>>1 and check if this helps.