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not able to mesh a shape

  • Alessandro
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15 years 5 months ago #2629 by Alessandro
not able to mesh a shape was created by Alessandro
I'm trying to mesh a particular shape: a cylinder with one socket for each side. I'm trying to do it using 3d-extrusion and quadratic mapping elements, but something is going worng and I'm not able to reach my intention: "unexpected geometry: wrong number of wires: 2"

This is just a case-study for a more complex assembly where i have a much more longer cylinder. This is the reason to use quadrangular elements instead of thetraedric as usual: I want to reduce the total number of elements (making them longer) in my assembly otherwise my 32bit system goes out of memory.

Attachment Study1.zip not found

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15 years 5 months ago #2630 by kwou
Replied by kwou on topic Re:not able to mesh a shape
Hoi Alessandro

I loaded your study1.hdf file and shortly looked at your mesh. I am not very fimiliar with submeshes. However, I see you do not have defined any subshape base_i that has been refered to in your mesh (quandrangle_2D, base_i). Sub_shapes base_e, top_i and top_e have been defined.
As said, I am not sure whether this is helpfull.

Kind regards - kees

Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)

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kind regards - kees
  • Alessandro
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15 years 5 months ago #2634 by Alessandro
Replied by Alessandro on topic Re:not able to mesh a shape
Thank you for your interest.
You're right, I made a mistake with the submesh. Now I corrected the mesh but my problem is still here. I tried with Salome 4.1.4 also but without significant improvement.
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15 years 5 months ago #2635 by kwou
Replied by kwou on topic Re:not able to mesh a shape
Hoi Alessandro

I played a bit further with the Quadrangle_2D mesher. I only succeeded using the Quadrangle_2D mesher for a rectangular or square area of eg. 1*1 mm2. The applied algorithms are Quadrangle_2D and Regular_1D, applied hypothesis Quadrangle (2D) and Automatic length (1D).

When I use the 2D area of a circle (or axial frontend of a solid cylinder) this yields the following error when using Quandrangle_2D: unexpected geometry: Face must have 4 sides but not 1.
So I think you cannot use Quadrangle meshing if you donot have a kind of [regular] area limited by 4 lines/wires, as eg. the square area of 1*1 mm2.

Using a the axial front of the hollow cylinder of your construction (face_1) you indeed get the error: unexpected geometry: wrong number of wires: 2.
So this might confirm that quadrangle_2D meshing needs 4 lines/wires as a boundary.

Using Netgen_3D_2D_1D meshes your construction without problems.

Hope this helps, but if someone has more information about quadrangle_2D meshing, pls let us known.

kind regards -kees

Interest: structural mechanics, solar energy (picture at 'my location' shows too little pv panels)

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kind regards - kees
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