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

[ICEM] icem hexa mesh parts pb

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 12, 2009, 18:35
Default icem hexa mesh parts pb
  #1
New Member
 
Join Date: Apr 2009
Posts: 18
Rep Power: 17
jaber is on a distinguished road
Hello dear colleagues,
I’m simulating a flow over a symmetrical NACA airfoil using ANSYSCFX11.so,to have a multiblock structured mesh, I have done a 2d extruded mesh using ICEM HEXA(v11).the steps followed are:

1-generating 2d geometry (airfoil+rectangular domain) using a scripts file. creating parts representing geometry families.
2-2d blocking (several operations) and 2d mesh.
3-extruding (1 layer) the 2d mesh after converting to unstructured mesh.

Results: having a 2d extruded mesh. But parts still representing lines and not sides. making pb to introduce boundary conditions (inlet,outlet,wall and airfoil).

please, I will be grateful to receive any idea or suggestions.


Last edited by jaber; June 12, 2009 at 18:58.
jaber is offline   Reply With Quote

Old   June 15, 2009, 10:49
Default were your line elements turned off or not selected?
  #2
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
In 2D to 3D, line elements become shells, points become lines. So, if you had line elements around the perimeter of your 2D model, they would become shells when you extruded to your 3D model. Perhaps you had the line elements off and selected only the 2D shells and 0D nodes for extrusion? This would give you volume elements and line elements, but not shell elements…
PSYMN is offline   Reply With Quote

Old   June 15, 2009, 10:52
Default Check edge associations
  #3
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
One other possibility is that when you created the blocking, you did not associate all the edges to the curves. This is a common mistake, particularly with the straight far field boundary (people don’t think they need to because it already looks right). Surface projected edges do not create line elements when converted to unstructured mesh, which means you wouldn’t have anything to convert to shells in 2D to 3D.

The fix is to go back to your blocking step and make sure to set up associations for all your perimeter edges… Then continue with your previous process.
PSYMN is offline   Reply With Quote

Old   July 5, 2009, 07:23
Default thanks
  #4
New Member
 
Join Date: Apr 2009
Posts: 18
Rep Power: 17
jaber is on a distinguished road
thanks Simon.the second one helps well.
but there is a pb whith some lines and shells that need not to be(on profile part,and top part).

Last edited by jaber; July 7, 2009 at 19:20.
jaber 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
icem hexa mesh beginner icem beginner FLUENT 2 July 9, 2008 08:27
ICEM hexa mesh 2d car example icem student Main CFD Forum 0 May 11, 2008 20:17
ICEM hexa mesh tutarial 2d car problem cfduser CFX 2 March 9, 2008 10:40
CFX mesh & ICEM mike CFX 3 April 27, 2006 16:27
mesh adaptation for hexa mesh Pete CFX 4 April 6, 2005 19:43


All times are GMT -4. The time now is 18:26.