node tolerance

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

Hello,

 

When i want to refine my mesh size i need to adjust the node tolerance. I know where to find it, but what exactly is the node tolerance?

 

Thank you

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2015

    The very first thing to know: when you set node tolerance = 0.1mm for example, you can not create element with size < 0.1mm :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20'>

    In general I work with node tolerance about 1/10 or 1/20 of my smallest element size.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2015

    Yes i jnow the element size must be larger than node tolerance. But what exactly is the node tolernace and what are the consequences when it is to large/small?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2015

    The simple method to undestand is try yourself.

    • If the tolerance is too large, you can not refine your mesh and 'equivalent' node will destroy completely your mesh.
    • If the tolerance is too small, HM can not detect coincident nodes for 'equivalent' node operation
    • etc...etc...

     

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