by pass element quality check

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hello

I am doing linear static analysis and I have used shell mesh to mesh the assembly.

<?xml version="1.0" encoding="UTF-8"?>2016-02-24_15-24-04.thumb.png.3ef887b8fc

one of the component has so many details so I have used very small elements in order not to miss the details of geometry.

<?xml version="1.0" encoding="UTF-8"?>2016-02-24_15-27-21.thumb.png.70a69e66ec

 

I have activated the PARAM-CHEKEL-NO in control cards but still when I run optistruct it gives me so many errors of 'elements with zero or negative jacobian' I have fixed some using quality index but there are more than 10000 failed elements and it is impossible to fix them all manually. Is there any way to by pass this element quality check??

 

Considering dimensions of components it is very reasonable to do shell meshing. If I use 3D tetra mesh the number of error decreases. I was wondering if using 3D tetra mesh for this kind of structure (two dimensions are much higher than the third dimension) add extra stiffness to the structure.

 

I appreciate your help

 

 

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited February 2016

    Hi,

     

    Looks like element quality is too bad for shell mesh.I hope you would meshed part with automesh with size & bias option.For complex part you can mesh part with by keeping quality checks.Automesh with QI optimize.see attached screenshot.

     

    Regards

    Rahul R

     

    <?xml version="1.0" encoding="UTF-8"?>QI optimize.JPG

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