Hypermorph

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

How to tackle the problem with negative jacobians while moving handles. what does it actually mean

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2014

    Hi ppsai1991

     

    what type of elements are you using?

     

    Jacobian is the deviation of an element from its ideal or 'perfect' shape.

     

    One way is the remesh the failed elements.

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited October 2014

    One can use Auto QA in the morph options panel, 

     

    The Auto QA subpanel holds options related to automatic checking and adjustment of element quality during morphing.

     

    You can use the check negative jacobian box, Whenever a morphing operation is performed, HyperMorph will check the model for elements with negative Jacobians. If one or more elements with a negative jacobian are found, an error will be reported and HyperMesh will be paused until you click the mouse button.  If you do not want this check to occur, such as if you are running a batch script, you can turn the check off.

    Quality Checks are discussed in detail in How Element Quality is Calculated the HyperMesh User's Guide. 

  • sagar_20757
    sagar_20757 Altair Community Member
    edited November 2014

    can you share the document on ' how element quality is calculated'. preferably in the form of PDF.

     

    thanks,

    sagar

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2014

    Hi Sagar,

     

    You can save the support documents in pdf form by clicking the printer icon on top right corner and then select 'save as PDF' in printer selection column (provided that you have adobe reader installed on your computer).

     

    Cheers,

    Wensong

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