CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[ICEM] Assigning geometry to blocking

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree2Likes
  • 2 Post By siw

Reply
 
LinkBack Thread Tools Display Modes
Old   September 19, 2013, 08:35
Default Assigning geometry to blocking
  #1
siw
Senior Member
 
Join Date: Jul 2009
Posts: 443
Rep Power: 13
siw will become famous soon enough
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 is offline   Reply With Quote

Old   September 19, 2013, 10:57
Default Issue solved
  #2
siw
Senior Member
 
Join Date: Jul 2009
Posts: 443
Rep Power: 13
siw will become famous soon enough
Found out how to do it:

Blocking > Associate > Associate Vertex > Enitity = Self
siw is offline   Reply With Quote

Old   September 19, 2013, 11:46
Default
  #3
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,905
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
Can you please explain it more?
Far is offline   Reply With Quote

Old   September 20, 2013, 04:46
Default More explanation
  #4
siw
Senior Member
 
Join Date: Jul 2009
Posts: 443
Rep Power: 13
siw will become famous soon enough
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 Meshing topology for heat transfer over ribs. 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.
Attached Images
File Type: jpg Image 1.jpg (48.7 KB, 15 views)
File Type: jpg Image 2.jpg (51.0 KB, 18 views)
File Type: jpg Image 3.jpg (51.6 KB, 19 views)
File Type: jpg Image 4.jpg (62.8 KB, 18 views)
Far and PSYMN like this.
siw is offline   Reply With Quote

Old   September 20, 2013, 08:49
Default
  #5
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,905
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to 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
Far is offline   Reply With Quote

Old   September 21, 2013, 01:02
Default
  #6
New Member
 
sridhar
Join Date: Apr 2010
Posts: 11
Rep Power: 7
sridhar.d009 is on a distinguished road
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
sridhar.d009 is offline   Reply With Quote

Old   September 23, 2013, 08:07
Default
  #7
siw
Senior Member
 
Join Date: Jul 2009
Posts: 443
Rep Power: 13
siw will become famous soon enough
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.
Attached Files
File Type: zip WMTC Coarse Mesh.zip (18.2 KB, 2 views)
siw is offline   Reply With Quote

Old   September 23, 2013, 10:54
Default
  #8
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,905
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
I have images as shown below? Do you have similar?


Far is offline   Reply With Quote

Old   September 23, 2013, 12:16
Default
  #9
siw
Senior Member
 
Join Date: Jul 2009
Posts: 443
Rep Power: 13
siw will become famous soon enough
Yes, I saw those as well. But it's all fixed now
siw is offline   Reply With Quote

Old   September 23, 2013, 12:20
Default
  #10
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,905
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to 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?
Far is offline   Reply With Quote

Old   September 23, 2013, 13:08
Default
  #11
siw
Senior Member
 
Join Date: Jul 2009
Posts: 443
Rep Power: 13
siw will become famous soon enough
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
siw is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Blocking and Symmetry BrolY ANSYS Meshing & Geometry 32 August 24, 2012 03:13
[ICEM] Some hints required on blocking geometry air_engineer_arsenal ANSYS Meshing & Geometry 6 August 16, 2012 11:58
[ICEM] Meshing adjacent wall geometry and simple ICEM questions everdimension ANSYS Meshing & Geometry 25 June 20, 2012 04:25
[ICEM] Best way to import geometry ICEM Cottbus ANSYS Meshing & Geometry 4 June 12, 2012 09:42
[ICEM] Blocking strategy BrolY ANSYS Meshing & Geometry 0 July 22, 2010 04:46


All times are GMT -4. The time now is 01:08.