Quality CHecks how it calculates these quality parameters while solving

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

Hello Rahul,

 

I just saw your explaination about what is warpage.

I would like to know how the calculations will be for it.( theory behind it)

say, Why we need to check warpage? ( what type of analysis)

what if I go above the limits whatever it is 5 or 15 degree.

what actually it is and how it will calculates 

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Answers

  • Sanjay Nainani_20973
    Sanjay Nainani_20973 New Altair Community Member
    edited February 2018

    Hello,

     

    All the element quality parameters are present so as HM can compare the elements to a standard one and depending on the differences which come between the standard and the element present determine the element quality.

     

    see  HyperWorks Desktop Applications > HyperMesh > User's Guide > Meshing > Checking & Editing Mesh > Element Quality:

     

    How Element Quality is Calculated

     

    Warpage is the amount by which an element (or in the case of solid elements, an element face) deviates from being planar. Since three points define a plane, this check only applies to quads. The quad is divided into two trias along its diagonal, and the angle between the trias’ normals is measured.

     

    hm_warpage.png

     

    Warpage of up to five degrees is generally acceptable.

     

    If you go beyond this value the element quality will go down which will affect the analysis results

     

    For more on this please refer the free eBook Practical Aspects of finite Element Simulation  page 238 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    I need to know how it will taken in to consideration while solving ( the theory of solving)

     

    say, I will go beyond 15 degree which I saw in some of the explicit dynamic Analysis projects, where we can go above 15 degree and it is acceptable.

     

    You said ' If you go beyond this value the element quality will go down which will affect the analysis results'. How it is affecting?

     

    so how the angle between those two normals effect the behavior while solving it 

     

     

     

  • Sanjay Nainani_20973
    Sanjay Nainani_20973 New Altair Community Member
    edited February 2018

    The different parameter values also differ from analysis to analysis. It may be acceptable that in dynamic analysis the value of warpage can exceed the value.

     

    As i said the values are there so that HM can compare it to a 'Standard'. So if the value exceeds that means there is a deviation from the standard and it will have effect on the results as we are not getting a standard element for analysis.

     

    The different parameters are the measure of how far a given element deviates from the ideal shape.

     

    The ideal shape for quad elements is square and that for triangular elements is equilateral triangle and as the element differs from the ideal element the analysis results deviate.

     

    Please see this document for effect of meshing on the element quality

    https://altairuniversity.com/wp-content/uploads/2014/02/2Dmeshing.pdf

     

    Thankyou

     

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