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

[ICEM] Block refinement button

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

Like Tree1Likes
  • 1 Post By Far

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 8, 2012, 04:49
Question Block refinement button
  #1
Senior Member
 
Anna Tian's Avatar
 
Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 15
Anna Tian is on a distinguished road
Hi,

May I ask a question about the ICEM button 'Blocking -> Pre-Mesh Params -> Refinement'?


I'd like to use this button to coarsen my mesh. The ICEM help tells

'
A Level value greater than 1 will result in refinement, while a Level value less than 1 will result in coarsening of the pre-mesh.
'

But when I set the level as the value as 0.8 or 0.5, it doesn't work. ( see the attached picture )


But actually I did put positive values there. ( like 0.5 and 0.8 are positive )

Could you please tell me how to solve this problem?
Attached Images
File Type: jpg Untitled.jpg (9.7 KB, 66 views)
File Type: jpg Untitled1.jpg (15.8 KB, 75 views)
__________________
Best regards,
Meimei
Anna Tian is offline   Reply With Quote

Old   August 8, 2012, 05:03
Default
  #2
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,553
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
instead of 0.5 put 1/2, for 0.25 use 1/4 and so on. Also 4/5 for 0.8
aero_head likes this.
Far is offline   Reply With Quote

Old   August 8, 2012, 05:25
Default
  #3
Senior Member
 
Anna Tian's Avatar
 
Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 15
Anna Tian is on a distinguished road
Quote:
Originally Posted by Far View Post
instead of 0.5 put 1/2, for 0.25 use 1/4 and so on. Also 4/5 for 0.8
It works. Haha...

But may that reduce my pre-mesh quality?
__________________
Best regards,
Meimei
Anna Tian is offline   Reply With Quote

Old   August 8, 2012, 12:36
Default
  #4
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,553
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
may be, but it depends upon ur solver. For example "Fluent requires 2:1 refinement or vice-versa and CFX requires 3:1 refinement". You can later edit this is edit mesh menu so that you have 1:1 after refinments

From ICEM Help

Quote:
Resolve refinements
is used to resolve couplings, which define the connectivity between elements which are not connected node by node (hanging nodes). In order to accommodate solvers that cannot handle couplings, this method can be used to resolve couplings using refinement and to make the mesh more conformal.
Far is offline   Reply With Quote

Old   August 11, 2012, 13:41
Question
  #5
Senior Member
 
Anna Tian's Avatar
 
Meimei Wang
Join Date: Jul 2012
Posts: 494
Rep Power: 15
Anna Tian is on a distinguished road
Quote:
Originally Posted by Far View Post
may be, but it depends upon ur solver. For example "Fluent requires 2:1 refinement or vice-versa and CFX requires 3:1 refinement". You can later edit this is edit mesh menu so that you have 1:1 after refinments

From ICEM Help
Doesn't this block refinement button always work very badly? I use non-uniform mesh. Sometimes 1/10 gives finer mesh than 1/3. And sometimes the mesh at some areas even disappear. Sometimes all the mesh disappear. Is there a better way to do the mesh coarsening instead of this button? What about the mesh refinement button 'edit mesh -> adjust mesh density' ?
__________________
Best regards,
Meimei
Anna Tian is offline   Reply With Quote

Old   August 11, 2012, 13:45
Default
  #6
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,553
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
Quote:
Originally Posted by Anna Tian View Post
Doesn't this block refinement button always work very badly? Sometimes 1/10 gives finer mesh than 1/3. Sometimes all the mesh disappear. And sometimes the mesh is not uniform any more. (Mesh at some areas even disappear. ) Is there a better way to do the mesh coarsening?
I dont think so that 1/10 produces finer mesh than 1/3 . can you please post some relevant pics?
Far is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[snappyHexMesh] Adding layers goes wrong with SnappyHexMesh Elise OpenFOAM Meshing & Mesh Conversion 1 April 22, 2013 03:32
[snappyHexMesh] snappyHexMesh refinement regions ignored guitarbren OpenFOAM Meshing & Mesh Conversion 2 April 9, 2013 04:59
killed "snappyHexMesh" parkh32 OpenFOAM Pre-Processing 2 April 8, 2012 18:12
[snappyHexMesh] snappyHexMesh aborting Tobi OpenFOAM Meshing & Mesh Conversion 0 November 10, 2010 04:23
[Commercial meshers] Icem Mesh to Foam jphandrigan OpenFOAM Meshing & Mesh Conversion 4 March 9, 2010 03:58


All times are GMT -4. The time now is 07:16.