Fluids

Fluids

how to improve mesh?

    • sadhurajesh
      Subscriber

      1.geometry

    • Keyur Kanade
      Ansys Employee
      Please check following videos

      Ansys Meshing: Decomposition for hex meshing:
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      Ansys Meshing: Meshing Methods:
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      First check the locations of the bad elements. Please see following video for the same.

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Once you have locations, please check if you can improve mesh using different mesh sizing. Please see following video.

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If this does not help, you may need to check if you can use pinch control or virtual topology.

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If this does not help, please go to geometry and modify or simplify geometry at those locations in SpaceClaim.
Regards Keyur
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  • sadhurajesh
    Subscriber
    how to rectify this error

  • Keyur Kanade
    Ansys Employee
    Are you using multizone.
    Please check tutorials on multizone. It would be better to split the geometry.

    Ansys Meshing: Decomposition for hex meshing:
    " target="blank">


    Ansys Meshing: Meshing Methods:
    " target="blank">

    Regards Keyur
    How to access Ansys Online Help Document
    Guidelines on the Student Community


  • sadhurajesh
    Subscriber
    how to split the geometry?

  • Rob
    Ansys Employee
    I tend to favour the Split command: have a look at the geometry tutorials.
  • sadhurajesh
    Subscriber
    where to where we have to split the body to get hex meshing
  • Rob
    Ansys Employee
    If you want a hex mesh you'll either need logical cubes (not something I'd try) or sweep. Personally, I'd be looking at Fluent Meshing and just poly the whole thing. How are you getting on with the tutorials?
  • sadhurajesh
    Subscriber
    Ansys Meshing: Decomposition for hex meshing:
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    I am unable to understand
  • Rob
    Ansys Employee
    Which bit?
  • sadhurajesh
    Subscriber
    after slicing
    mesh
    How to improve the mesh? while solving i am getting floating point exception
  • Rob
    Ansys Employee
    I'm assuming you checked the cell skew? What is causing the blocks to distort like that?
  • sadhurajesh
    Subscriber
    skewness - min 1.3057e-010, avg 6.0265e-002, max 0.97917
    aspect ratio- min1.0002, max 82.067
    orthogonal quality- min 2.0831e-002, max 1, avg 0.94992
    element quality- min 3.6629e-003, max 1, avg 0.72873
    these are the mesh quaities. how to improve skewness
  • Rob
    Ansys Employee
    By understanding why the skew cells are created: why are they getting squashed in the image?
  • sadhurajesh
    Subscriber
    after meshing they squashed
  • Rob
    Ansys Employee
    Look carefully, and use cut planes (show full cells) to see what's going on. Please post those images so I can see what's going on.
  • sadhurajesh
    Subscriber
    1

  • sadhurajesh
    Subscriber

  • Rob
    Ansys Employee
    Click on the blue tetrahedron in the cut plane panel, that shows the full cells. However, I think your problem is that you've meshed the thickness of the baffles: the jump in cell size is then huge which isn't going to result in a stable run. You also want at least 6 cells between the plates to get anywhere near sufficient resolution to pick up the velocity profile.
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