Bad mesh quality of cylinder model

ju1995
ju1995 Altair Community Member
edited August 2022 in Community Q&A

Good afternoon,

I'm using FEKO 2018 and I'm trying to create a hollow cylinder with an aperture at the top. For this purpose I created two cylinders, substracted one from the other to create the hollow inner space and subtracted a cuboid to create the aperture. Unfortunately, after meshing, the mesh quality is very bad compared to a full cylinder of same dimensions.

How can I achieve a better mesh quality? I also recognized, that the hollow cylinder seems to be meshed both outside and inside as the number of mesh elements is much larger. Can I make the cylinder's surface infinitely thin somehow, in order not to mesh the cylinders inner and outer surface?image

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Answers

  • Torben Voigt
    Torben Voigt Altair Community Member
    edited August 2022

    Hi @ju1995 ,

    I assume that the inner cylinder is only a little bit smaller than the outer cylinder, so that the mesh triangles (which are flat) intersect. I would propose to just create one cylinder and set the region to freespace. Then all you need to do is cut a hole into the top by subtracting a cuboid.

    If you for some reason nedd the small thickess of the cylinder walls, you could refine the mesh settings so that no more intersections occur. This will of course lead to a high number of mesh elements and thus long runtime and high memory requirement.

    image

    image

    I attached an example.

     

    Best regards,
    Torben

  • ju1995
    ju1995 Altair Community Member
    edited August 2022

    Great hint, this solved my problem. Thank you a lot!

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