Bad mesh quality of cylinder model

ju1995

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?

mesh.png

Torben Voigt

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.

I attached an example.

 

Best regards,
Torben

cylinder.cfx