[siw]

Hi,

I've made a Hexa mesh but there are some problems with it. ANSYS tech support have raised a defect report and recommend putting some curves where the block edges are and making the associations. To make sure I get the geometry (points and curves) in exactly the corrects places is it possible to make a point and locate it at exactly where a vertex is? I cannot see a way to do this exactly. This is always done the other way around with blocking assigned to geometry.

Thanks.

[siw]

Found out how to do it:

Blocking > Associate > Associate Vertex > Enitity = Self

[Far]

Can you please explain it more?

[siw]

I'll explain it a bit more. I'm making a Hexa mesh with a very similar blocking layout as in Option 2 of Far's post at http://www.cfd-online.com/Forums/mai...over-ribs.html. My mesh is for a different purpose to Far's mesh so is not exactly the same.

I've highlighted in red in the images where the pre-mesh is curved or angled and not following the orthogonal block edges. This is what needed to be fixed and I mentioned one method above (thanks to ANSYS tech support).

Another way to fix this is to "To over ride it, just put in a linear edge split on those edges, but don't move it (so it keeps the edge straight)." aka "Another workaround is to use the "Link Edge" function under Blocking tab > Edit Edge >". Thanks to PSYMN for these.

[Far]

I have couple of observations:

1. Why it was curved in first place when the corresponding block edges and mesh in the inner square is not of curved shape and nor you have given any curvature to edges in outside square?

2. It is also seen some times that mesh is bit curved and that might be due to algorithm behind the scene which is trying to smooth out mesh at outer edges as you have highlighted.

3. This could have been done with link edge command and specifying the 1 or lesser value in field "Factor"

4. If you look at the post of mine which you are referring to, I don't see any of these issues at all. Why?

I have one question too: To which part you have associated the vertices and which vertices

[sridhar.d009]

Dear Siw

Follow these steps
1. Disable vorfin in model tree at parts (for visibility of blocking clearly)
2. Enable points, curves and surfaces in model tree at Geometry (for visibility of geometry)
3. Associations
a) Associate vertex
blocking> blocking associations>edit association>associate vertex>entity>
enable pont>select vetex and near pont.
b) Associate edgges
blocking> blocking associations>edit association>associate edge to curve>
select edge and near curve.
c) Associate faces
blocking> blocking associations>edit association>associate face to surface> select face and near surface.

then give edge perameters
then pre-mesh

[siw]

The link edge option fixed this.

Far, attached is zipped my *.tin and *.blk files for the mesh without the fix so you can see this and compare with your geometry.

[Far]

I have images as shown below? Do you have similar?

[siw]

Yes, I saw those as well. But it's all fixed now

[Far]

But you said the files you are attaching are without fix. I got pics from those files. You think they are fixed or not?

[siw]

The files I attached was before I fixed the mesh. That is why those images you posted look wrong, just like the images I posted near the start of this topic. Now, I have fixed the mesh