Topology optimization -error negative jacobian

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

Hello,

 

I am doing the topology optimization of a part with solid hexa elements. While running the optimization it shows that a particular element has zero or negative jacobian.

 

I masked that element seperately and modified the distance between the nodes so that the jacobian value is increased and again run the optimization.

 

Now it is showing that there is an error with node numbering sequence, I renumbered all nodes as well as elements. But the error persists.

 

How to resolve this.

 

The exact error is as follows

 

 
 *** ERROR # 2502 ***
 Element 27226 had incorrect node numbering sequence and needs renumbering.

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited August 2015

    Hi,

     

    Generally by improving mesh quality it should run.Which version of Hypperworks you are using? (Student or full version)

    If full version then share the updates information.

     

    Regards

    Rahul R

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    Hi Rahul,

     

    It is a full version Hyperworks13.0.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited August 2015

    Hi,

     

    Can you renumber all node IDs in your model?

     

    The error message says, the node numbering is wrong. 

     

    Check if renumbering helps or not.

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