CFD Online URL
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[ANSYS Meshing] Meshing in ICEM using Octree mesh algorithm

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

Like Tree1Likes
  • 1 Post By davidwilcox

Reply
 
LinkBack Thread Tools Display Modes
Old   December 1, 2012, 00:32
Default Meshing in ICEM using Octree mesh algorithm
  #1
Member
 
david
Join Date: Oct 2012
Posts: 55
Rep Power: 4
davidwilcox is on a distinguished road
Hi,
I need the help of all the ICEM experts. I am trying to mesh a place with plenty of buildings, of which some of them are complex. This has to be done in 3D. I have been trying for almost 3 weeks now but I'm still getting errors in computing the mesh with tetrahedrals. I tried to mesh one building and brought it into fluent but I can't even get that right because it gives me negative volume when i imported it in. And sometimes I have a hole in my mesh( which i do not know how to fix).
I have always been a fan of blocking and that is pretty much how I create all of my previous mesh. But this is a case where blocking is simply impossible. Can you offer me some tips?

I have attached my nightmare geometry to this post. Many thanks in advance.
Attached Images
File Type: jpg solid.jpg (90.2 KB, 25 views)
Far likes this.
davidwilcox is offline   Reply With Quote

Old   December 1, 2012, 17:11
Default
  #2
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Canada
Posts: 1,268
Blog Entries: 23
Rep Power: 19
diamondx will become famous soon enough
Send a message via MSN to diamondx
run a geometry repair, it will look for the holes you have and close it... tell us how it goes...
__________________
Regards,
New to ICEM CFD, try this document --> http://goo.gl/G2gkE
Ali
diamondx is offline   Reply With Quote

Old   December 1, 2012, 18:42
Default
  #3
Member
 
david
Join Date: Oct 2012
Posts: 55
Rep Power: 4
davidwilcox is on a distinguished road
will do, Ali. But I am now thinking if it is possible to break this cfd simulation into parts. I could simulate, say for an example, 1/4 of the geometry and then use the results from that simulation as an inlet condition for the other parts. Is this ridiculous?
davidwilcox is offline   Reply With Quote

Old   December 17, 2012, 06:00
Default
  #4
Member
 
david
Join Date: Oct 2012
Posts: 55
Rep Power: 4
davidwilcox is on a distinguished road
Ok.. as promised, the mesh is attached. I did a geometry repair. For the benefit of those who do not know what i meant by that, it is a procedure in ICEM to make sure there are no leakages. and what i mean by leakages is holes in the geometry that will affect your mesh when using the octree algorithm.
So what i did was set the tolerance really low. Once i did that, i put in a script to determine the maximum size on each edge. I initially tried putting number of nodes on each curve but this did not work out too well. Thanks for all the help, Ali, Stu, Far and all.
Attached Images
File Type: jpg screenshot.jpg (84.3 KB, 18 views)
davidwilcox 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] complex 2D meshing on ICEM kassab ANSYS Meshing & Geometry 26 April 14, 2014 22:02
[ICEM] Meshing adjacent wall geometry and simple ICEM questions everdimension ANSYS Meshing & Geometry 25 June 20, 2012 05:25
snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Native Meshers: snappyHexMesh and Others 2 March 27, 2011 22:11
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 19:10
Missing tets along line when meshing with ICEM CFD Georges P. Côté CFX 6 March 23, 2006 01:34


All times are GMT -4. The time now is 11:56.