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

[GAMBIT] BC's value assignment in Gambit Vs. Fluent (solver)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 20, 2010, 20:24
Question BC's value assignment in Gambit Vs. Fluent (solver)
  #1
Member
 
Khayyamian
Join Date: Dec 2010
Posts: 46
Rep Power: 6
hadikhayyamian is on a distinguished road
Hi all,

I was wondering the difference of assigning boundary conditions in Gambit and doing the tha same job in Fluent again.

For example, when I make my geometry in Gambit, I have to define boundary conditions types (say, I select a face as inlet velocity) then I am asked to put its value (velocity magnitude is asked).
But my problem is that when I finish working with Gambit and have to open the meshed file in Fluent Solver, Again I am asked to put associated values for each Boundary Conditions (While I have earlier assigned them in Gambit).

I would like to know why these input values are asked twice?

It would be greatly appreciated, if u reply!

Regards.
hadikhayyamian is offline   Reply With Quote

Old   December 20, 2010, 21:51
Default
  #2
Senior Member
 
Real Name :)
Join Date: Jan 2010
Location: United States
Posts: 180
Rep Power: 7
ComputerGuy is on a distinguished road
hadikhayyamian,

Are you sure that it's not asking you for the boundary name, rather than the boundary value? Gambit is really just a model/mesh creation tool, and doesn't have any reason to ask for inputs on boundary conditions.

The bottom line is: if you have discovered a way to enter such values in Gambit (again, I don't think there is), just don't. All you should have to do is define the type of boundary and the name. Stick with entering the actually boundary values in Fluent.

ComputerGuy
ComputerGuy is offline   Reply With Quote

Old   December 20, 2010, 23:09
Default
  #3
Member
 
Khayyamian
Join Date: Dec 2010
Posts: 46
Rep Power: 6
hadikhayyamian is on a distinguished road
ComputerGuy;
Thanks for your Extra Fast reply!

I was convinced with your reply.
but I just wanted to prove u what I was talking about by showing u a document. (It is part of a presentations which is talking about Gambit).
but I could not attach it, since it exceeds maximum size.

Thanks.
hadikhayyamian is offline   Reply With Quote

Old   December 21, 2010, 04:46
Default
  #4
Super Moderator
 
-mAx-'s Avatar
 
Maxime Perelli
Join Date: Mar 2009
Location: Switzerland
Posts: 2,973
Rep Power: 30
-mAx- will become famous soon enough
you cannot give any value in the BC panel from Gambit. (I am interested by your document)
PS: Gambit doesn t provide any unity with your geometry. You have to scale it in the solver.
So giving values to your BC doesn't make sense, since you would have to modify them again in the solver.
__________________
In memory of my friend Hervé: CFD engineer & freerider
-mAx- is offline   Reply With Quote

Old   December 21, 2010, 10:25
Default
  #5
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
Yes, I actually talked to some developer types about this a few years ago... I was told that The msh format can hold the boco type, such as INLET, but it doesn't even have a place to put the actual value, such as 10 m/s. I am pretty sure your document is wrong or perhaps mis-interpreted, but I am also interested in seeing it if you could post it somewhere and give us a link.

Usually, I create the boco types, such as Inlet, outlet, symmetry, etc. while I am in the mesher. This way, I am confident that I have all the types while it is still easy to create more if I want. Then I go to Fluent and quickly assign the values. If you get to fluent and don't have a boundary name, it is a hassle to separate one out there.

But, as long as you have the boundary names, you could also just assign both the types and the values in Fluent if you prefer.
PSYMN is offline   Reply With Quote

Old   December 21, 2010, 13:28
Default
  #6
Member
 
Khayyamian
Join Date: Dec 2010
Posts: 46
Rep Power: 6
hadikhayyamian is on a distinguished road
Thanks guys for your answers;

My problem is now resolved, but if u are intrested in that document, I can mail to your Email.

Thanks again.
hadikhayyamian 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
[GAMBIT] SketchUp Pro to Fluent or Gambit CFD Steve Johnson ANSYS Meshing & Geometry 3 May 16, 2013 02:05
Importing Gambit data into Fluent Tyred ANSYS Meshing & Geometry 1 April 18, 2009 13:53
help for opening gambit file n Fluent..... rizwan FLUENT 1 March 22, 2009 23:41
Retrieving files in GAMBIT & FLUENT Vidya Raja FLUENT 0 November 5, 2005 21:26
Fluent case file into Gambit Eric R. FLUENT 7 July 17, 2002 14:11


All times are GMT -4. The time now is 05:54.