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

[GAMBIT] Mesh problems

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 7, 2010, 04:49
Default Mesh problems
  #1
New Member
 
Shreyas
Join Date: Jun 2010
Posts: 7
Rep Power: 7
shreyas is on a distinguished road
Hi

I'm currently doing a project related to cfd. I'm supposed to analyze the flow over a 30 cm MAV(micro aerial vehicle) . I use gambit for meshing and fluent for solving. I tried both these methods and dint find them useful:

1) importing a catia model of the MAV(igs) and then trying to make a virtual model by subtracting from a cuboid in gambit.

2) Exporting the subtracted volume as igs and trying to mesh it.

Fluent is not able to recognize the MAV cavity as a boundary condition

What do I do????

shreyas
shreyas is offline   Reply With Quote

Old   June 7, 2010, 15:00
Default
  #2
Senior Member
 
Chris
Join Date: Jul 2009
Location: Ohio, USA
Posts: 169
Rep Power: 7
Chris D is on a distinguished road
What boundary conditions are you using for the "MAV cavity"? If you set the faces that define the cavity as a wall boundary in GAMBIT, then there shouldn't be a problem when you read the grid into FLUENT. What is the error that you're getting?
Chris D is offline   Reply With Quote

Old   June 7, 2010, 23:20
Default
  #3
New Member
 
Shreyas
Join Date: Jun 2010
Posts: 7
Rep Power: 7
shreyas is on a distinguished road
Thank you Chris

I have set the faces of the Mav as a wall.....gambit says it has meshed successfully, but when the msh file is imported to fluent it does not recognize the "MAV" wall at all in the "set boundary conditions" list . One thing I noticed is that I could not create a single virtual volume in both the methods of geometry creation described previously. It only allows me to stitch faces to form multiple vrtual volumes.

Regards
Shreyas
shreyas is offline   Reply With Quote

Old   June 8, 2010, 01:19
Default
  #4
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,965
Rep Power: 30
-mAx- will become famous soon enough
sounds weird...
Are you able to see the cavity (display grid)
can you post a picture.
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   June 8, 2010, 04:03
Default
  #5
New Member
 
Shreyas
Join Date: Jun 2010
Posts: 7
Rep Power: 7
shreyas is on a distinguished road
No, The set of faces i named "MAV" isnt present in any list....whether BC's or display grid. Once I import it to fluent , Only the cube that represents the flow appears with inlet and outlet. I'm quite sure its a problem with the geometry creation.When I import it the edges appear as virtual ones. I then create a cuboid and delete it after unchecking lower geom. option. Then I try to stitch faces...mesh..zones..export.

Wheres the prob
shreyas is offline   Reply With Quote

Old   June 8, 2010, 06:04
Default
  #6
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,965
Rep Power: 30
-mAx- will become famous soon enough
In gambit if you click on your "MAV" entity (in the BC list), it is red-shown ? or it is dismissed?
Once you exported your mesh (File/export/mesh) do you have any warning?
In Fluent, if your MAV entities are not present in the BC-list, then it should be included in the default-wall BC created by gambit (you can display this BC) and check if your MAV entity is present.
If not, then you have a problem in your geometry
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   June 8, 2010, 06:33
Default
  #7
New Member
 
Shreyas
Join Date: Jun 2010
Posts: 7
Rep Power: 7
shreyas is on a distinguished road
The first time I meshed it, the wing edge looked red if i remember clearly. Now its not red. and no it does not appear as default 2d...will try correcting my geometry somehow...thanks
shreyas is offline   Reply With Quote

Reply

Tags
fluent, gambit

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
SnappyHexMesh for internal Flow vishwa OpenFOAM Native Meshers: snappyHexMesh and Others 23 August 6, 2014 03:50
problems import mesh from icem11!!! Julieta CFX 4 March 23, 2008 10:17
Problems using dynamic mesh and 6dof solver Brett FLUENT 0 March 3, 2006 18:45
Problems importing written gambit .neu mesh file jemteo FLUENT 3 February 20, 2006 02:42
Gambit problems Althea FLUENT 21 February 6, 2001 08:05


All times are GMT -4. The time now is 13:16.