CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Icem cfd Cartesian mesh method size proplem

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 18, 2009, 13:50
Default Icem cfd Cartesian mesh method size proplem
  #1
New Member
 
onder
Join Date: Mar 2009
Posts: 14
Rep Power: 8
mztcu is on a distinguished road
hi everyone
first ı am sory for my english
my problem
I want do mesh with cartesian method. there are 8 surface and ı chose diffrent size for surfaces like 1m,3m,5m . when computed the mesh every surfaces size to be the smallest value 1m Icant use diffrent size. Anyone help me ? Thanks everything
mztcu is offline   Reply With Quote

Old   May 18, 2009, 20:02
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,646
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Hi,

Have you done the ICEM tutorial examples. This sounds like a pretty basic problem to me, you need to learn the fundamentals.

Glenn Horrocks
ghorrocks is offline   Reply With Quote

Old   May 20, 2009, 14:25
Default help
  #3
New Member
 
onder
Join Date: Mar 2009
Posts: 14
Rep Power: 8
mztcu is on a distinguished road
I have not much time .
please some ona help me.
how I do diffrent size for surface at cartesian mesh
mztcu is offline   Reply With Quote

Old   May 20, 2009, 18:45
Default
  #4
Member
 
Jules Bell
Join Date: May 2009
Posts: 31
Rep Power: 8
Jules is on a distinguished road
Your problem is not specified very clearly but consider this:
For a cartesian mesh (block structured mesh), blocks sharing one edge (adjacent surfaces) must have equal number of nodes in the direction (i,j, or k) of that edge, because grid lines cannot "end" in the middle of the mesh, they have to go all the way through from one side to the other.
Probably for that reason, the mesher adjusts all the spacings to be the same, to ensure equal number of nodes.
How are you creating your mesh? From blocking (Pre-Mesh) or from surface mesh?
Jules is offline   Reply With Quote

Old   May 24, 2009, 19:56
Default
  #5
Senior Member
 
Rogerio Jack
Join Date: Mar 2009
Location: Brazil
Posts: 100
Rep Power: 7
rogbrito is an unknown quantity at this point
Send a message via Skype™ to rogbrito
I´d like to use this type of mesh, using a cartesian method, but it didn´t work out with my geometry. What is your geometry?

Rogerio.

Quote:
Originally Posted by mztcu View Post
hi everyone
first ı am sory for my english
my problem
I want do mesh with cartesian method. there are 8 surface and ı chose diffrent size for surfaces like 1m,3m,5m . when computed the mesh every surfaces size to be the smallest value 1m Icant use diffrent size. Anyone help me ? Thanks everything
rogbrito is offline   Reply With Quote

Old   May 25, 2009, 08:45
Default
  #6
New Member
 
onder
Join Date: Mar 2009
Posts: 14
Rep Power: 8
mztcu is on a distinguished road
ı want simulate free surface around the ship hull.geomtry ship hull and sea like pool
mztcu is offline   Reply With Quote

Old   May 26, 2009, 08:55
Default Pure Cartesian vs. Unstructured Cartesian
  #7
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,662
Blog Entries: 1
Rep Power: 35
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Your problem probably has to do with uniform sizes, but once you fix that, you will still have issues because your sizes are not powers of 2…

If you are generating a uniform mesh, then the smallest “max size” is applied to the entire model… This is probably your problem. Look at your settings carefully. I agree about trying a tutorial or two, they don’t take long each and would have got you going faster than waiting for a reply from us.

The other issue is that the Cartesian and Octree methods can’t give you every size, only powers of 2. In this case, you can’t have sizes 1, 3 and 5 in the same model because these are not powers of 2. You could have sizes 1, 2, 4, or sizes 1.5, 3, 6 or sizes 1.25, 2.5, 5. Get it?
PSYMN is offline   Reply With Quote

Old   May 26, 2009, 23:43
Default
  #8
New Member
 
onder
Join Date: Mar 2009
Posts: 14
Rep Power: 8
mztcu is on a distinguished road
thank you very much I will try
mztcu 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
mesh from icem cfd to cfx, how? Rogerio Fernandes Brito CFX 15 August 27, 2011 15:05
multizone unstructred mesh in icem cfd. Micheal CFX 0 October 9, 2006 04:35
About Mesh size setting in ICEM Eric CFX 2 July 11, 2006 08:16
ICEM CFD surface mesh Francesco CFX 1 May 31, 2006 11:09
Mesh from ICEM CFD to CFX ! Error ! Why ? Thanks ! Vu Trinh Tuan CFX 11 March 28, 2005 19:04


All times are GMT -4. The time now is 15:44.