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

ICEM meshing question

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

Like Tree2Likes
  • 1 Post By PSYMN
  • 1 Post By PSYMN

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 10, 2010, 09:33
Default ICEM meshing question
  #1
New Member
 
Gagan
Join Date: Jun 2010
Posts: 7
Rep Power: 15
gsbhatia89 is on a distinguished road
Hey everybody,

I had a question for a beginning mesher in ICEM

I have a complex 3d geometry that needs to be meshed in quite some detail and ansys mesher isnt enough to do the job. (Image is attached herewith)

http://img202.imageshack.us/i/crossmodel.png/

It is a long tube in which there is intersection of two tubes and there are five holes in this intersecting tubes through which fuel is injected into the main tube containing air.

I wished to ask you if it possible to somehow import the solid model into ICEM so that the geometry creation is easily done or should I begin the geometry from scratch in ICEM. If I have to do it directly in ICEM, do you have any ideas on how I could go about meshing this model...

I would be really happy if somebody could let me know something about it..

Regards,
Gagan
gsbhatia89 is offline   Reply With Quote

Old   June 11, 2010, 09:13
Default Either way...
  #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
Yes, this geometry could be created in ICEM CFD... It is just circles extruded, intersected and trimmed. But if you have it in another format, you can just import it into ICEM CFD. Is this model done in DM? In ICEM CFD, top left corner File => Workbench Readers. Or your could export it from DM as an ICEM CFD Tetin file. ICEM CFD can also read ACIS, DWG/DXF, RHINO, STL/VRML, STEP/IGES, etc. If you have the CAD reader keys, you could read it in from Parasolid, CATIA, Pro/E, Solidworks or UG...

I am surprised to read that you couldn't get a good mesh on this with the ANSYS mesher (it is a pretty simple geometry). What kind of mesh were you looking for?

Simon
Mfaizan likes this.
PSYMN is offline   Reply With Quote

Old   June 11, 2010, 09:24
Default
  #3
New Member
 
Gagan
Join Date: Jun 2010
Posts: 7
Rep Power: 15
gsbhatia89 is on a distinguished road
hey,

I made this model in ansys. Well if you import it using workbench readers..it doesnt really do a great job of importing the curves and only some bit of the geometry is converted into ICEM.

With the ansys mesher, I get a decent mesh of 50k elements which I was told is not enough at all to analyse this sort of simulation. Also I had posted on the CFX part of the forum. I tried simulating with the ansys mesh in CFX, the problem is ..the multicomponent species mixing at high turbulence is not happening correctly...http://img526.imageshack.us/i/covolu...ion091102.png/

In conditions of high turbulence it should behave more like chaotic mixing but this seems like just laminar flow... =/

Anyway to give you a background again, the syngas(CO/h2) is injected through that cross geometry while air passes by it..and the aim is analyse the mixing..
gsbhatia89 is offline   Reply With Quote

Old   June 11, 2010, 09:34
Default Give it another try.
  #4
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
It should import from DM (or directly via the workbench readers) perfectly. Maybe I can get this model from you and send it to development for testing.

My guess is you just need to refine your mesh in Workbench. You probably also need to refine in the volume. (with a body of influence). Is your physics set to CFD? Did you turn on the sizing function? Did you increase the relevance?

You could get a really nice Hexa Mesh in ICEM CFD (if that is what you are after, I could show you how), but if you just want a tetra prism mesh, I would suggest you try again in ANSYS Meshing. You just need to control the mesh size a bit better.

Simon
Mfaizan likes this.
PSYMN is offline   Reply With Quote

Old   June 11, 2010, 10:00
Default
  #5
New Member
 
Gagan
Join Date: Jun 2010
Posts: 7
Rep Power: 15
gsbhatia89 is on a distinguished road
thank you very much for your help..

I want to learn more about how to work on ICEM and also the ansys mesher so I wish to try it myself first...

Could you tell me more about the hexa meshing in ICEM...if it doesnt take a month to do it..I might as well go for it!

http://img265.imageshack.us/i/importedgeometry.png/

this is the imported geometry (and the mesh with it...not shown) ...I beleive I need to create topology or work with surface creation etc.. You could elaborate from here...

....
Also I havent played around with volume meshing in the ansys mesher as of yet...And I will look into the advanced sizing as well..and the relevance...

Regards
Gagan
gsbhatia89 is offline   Reply With Quote

Old   June 14, 2010, 09:24
Default
  #6
New Member
 
Gagan
Join Date: Jun 2010
Posts: 7
Rep Power: 15
gsbhatia89 is on a distinguished road
.....

Bump!...
gsbhatia89 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] Unstructure Meshing Around Imported Plot3D Structured Mesh ICEM kawamatt2 ANSYS Meshing & Geometry 17 December 20, 2011 12:45
Information on Multizone meshing in ICEM DarrenC ANSYS Meshing & Geometry 1 April 21, 2010 17:27
ICEM meshing of sharp corner Sans CFX 3 January 17, 2008 08:36
ICEM meshing problem Forrest CFX 4 May 25, 2005 19:37
ICEM 5.0 - double meshing Joan CFX 0 November 7, 2004 07:09


All times are GMT -4. The time now is 23:42.