How to mesh a hollowed sphere

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

Hello,

I'm involved to mesh the attached solid model in order to optimize a three dimensional node. It's a hollowed sphere cutted on the top and some random holes. The point is the model doesn't present symmetries. How can I mesh this solid? First of all, at the beginning I find an edge problem showed. 

Can someone please lead me in this particular process?

Thanks.

 

Alberto

<?xml version="1.0" encoding="UTF-8"?>Sphere 1.png

<?xml version="1.0" encoding="UTF-8"?>Sphere 3.png

<?xml version="1.0" encoding="UTF-8"?>Sphere 2.png

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Answers

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited November 2018

    Hi albertolazzeri

     

    You can remove the free edges in the geometry by the option Geometry > Edge edit > equivalence

     

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.b701cb010fafad2a7eb46ece14c34aef.png

     

    Then you can do a Tetra mesh once it has became an enclosed volume.

     

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.4e71bde4f0e55ec090a1512b304b6450.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018

    Thank you very much Pranav Hari for your quick answer,  the edge's problem is solved, but the message 'the mesh is not enclosed' continue to appear.

    Can I try to mesh the external surface and extend all the thickness up to the inside edge?  Could this method works?

    Thank you very much

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited November 2018

    Hi albertolazzeri

     

    Can you please share your model. I will check and try.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018
  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018

    I removed the free edges in the geometry and I meshed the sphere but some holes result full, not more empty. I tried the boolean subtraction with a cylinder to recondition the hole but the program doesn't not allow me to select the sphere.

    Any suggestions?

     

    <?xml version="1.0" encoding="UTF-8"?>2.thumb.png.8715e826adc9c03b60e01ddcff83d22c.png<?xml version="1.0" encoding="UTF-8"?>1.thumb.png.be3688588b881a6a857a123f0a14793a.png

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited November 2018

    I removed the free edges in the geometry and I meshed the sphere but some holes result full, not more empty

     

    Hi albertolazzeri

     

    Did you mean you want to make the cylinder hollow on both sides

  • Pranav Hari
    Pranav Hari Altair Community Member
    edited November 2018

    Hi albertolazzeri

     

    You can use geometry > surface edit > trim with surface to remove the unwanted surface on top of the sphere.

    check this video on how to trim surfaces

    Once you trim surface you can mesh it and clear the free edges.

     

     

    Unable to find an attachment - read this blog

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2018

    Thank you very much for your help.

    Very professional and exhaustive, I made some basic errors in the procedure.