CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Mesh motion applied to an internal interface

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 13, 2007, 13:33
Default Dear all, Right now, I am s
  #1
Senior Member
 
Frank Bos
Join Date: Mar 2009
Location: The Netherlands
Posts: 338
Rep Power: 9
lr103476 is on a distinguished road
Dear all,

Right now, I am struggling with the following. I would like to define an interface within the mesh and the flow needs to go through the interface. Secondly, that interface needs to move according to a moving body which is located inside the region surrounded by the interface.

Two questions:
1) What is the easiest way to define such an interface. Using gambit, the interface becomes a wall :-(. Will setFace do the job?

2) Which available boundary condition do I have to use on that interface, such that flow is flowing through. I managed to move the interface (insideSlider / outsideSlider) of the mixer2D, but the boundary condition on the interace remains unclear to me....

Btw, I am using icoDyMFoam with some dynamicFvMesh based libraries to account for the motion of a body, and preferably some interfaces.

Thanks and regards,
Frank
__________________
Frank Bos
lr103476 is offline   Reply With Quote

Old   September 14, 2007, 02:32
Default Anyone? Is there a boundary co
  #2
Senior Member
 
Frank Bos
Join Date: Mar 2009
Location: The Netherlands
Posts: 338
Rep Power: 9
lr103476 is on a distinguished road
Anyone? Is there a boundary condition for interface patches, where the flow goes through?

Thanks, Frank
__________________
Frank Bos
lr103476 is offline   Reply With Quote

Old   September 14, 2007, 03:19
Default Frank, If I understand your qu
  #3
Senior Member
 
Srinath Madhavan (a.k.a pUl|)
Join Date: Mar 2009
Location: Edmonton, AB, Canada
Posts: 698
Rep Power: 12
msrinath80 is on a distinguished road
Frank, If I understand your question correctly, then by interface you actually mean some kind of porous media or membrane?
msrinath80 is offline   Reply With Quote

Old   September 14, 2007, 03:25
Default Well, it is just a patch, cons
  #4
Senior Member
 
Frank Bos
Join Date: Mar 2009
Location: The Netherlands
Posts: 338
Rep Power: 9
lr103476 is on a distinguished road
Well, it is just a patch, consisting of an array of cell faces. But indeed, you can see it a a infinite small membrane, which has to have no effect on the flow! In Fluent, you can do anything with such an internal interface.

I like to specify the motion of certain internal interfaces in order to have some more control on the overall moving mesh quality.

Regards, Frank
__________________
Frank Bos
lr103476 is offline   Reply With Quote

Old   September 14, 2007, 03:29
Default In the tet FEM solver I wrote
  #5
Senior Member
 
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,758
Rep Power: 21
hjasak will become famous soon enough
In the tet FEM solver I wrote this is quite easy: you can group the faces and apply a constraint defining the point motion there directly on the matrix. The rest is trivial.

Enjoy,

Hrv
__________________
Hrvoje Jasak
Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk
hjasak is offline   Reply With Quote

Old   September 14, 2007, 03:35
Default Hello Hrvoje, Uhmm, I don'
  #6
Senior Member
 
Frank Bos
Join Date: Mar 2009
Location: The Netherlands
Posts: 338
Rep Power: 9
lr103476 is on a distinguished road
Hello Hrvoje,

Uhmm, I don't really understand how to do that. Do I have to program a new library or can I just apply a BC?

Besides, I really like to use the new finite volume based mesh motion, for my problems it is a lot faster....

Regards,
Frank
__________________
Frank Bos
lr103476 is offline   Reply With Quote

Old   March 12, 2008, 22:07
Default Hi Frank, Have you get any
  #7
New Member
 
Zhan
Join Date: Mar 2009
Posts: 1
Rep Power: 0
zhan001 is on a distinguished road
Hi Frank,

Have you get any progress on this issue? I am at the beginning stage of the problem which is much similar with yours.
1. How do you deal with the membrane? Are you using nonlinear elasticity model? (I mean when the membrane got stretched)
2. How do you implement the FSI task with OpenFOAM? I did not see an adequate solver for this purpose.
3. Does your problem involve extremely large membrane deformation?

Sorry for so many asking, thanks.
Zhan
zhan001 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
TGridFluent mesh with internal by prism layer and internal face for diagnostic sponiar OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 March 30, 2009 15:02
Mesh motion with sliding interface problem sebastian_neumann OpenFOAM Running, Solving & CFD 0 December 16, 2008 10:26
Diff. between interface, internal and interior BCs CUser FLUENT 2 November 3, 2008 21:08
Oscillatory mesh motion setup mesh flux ERROR jaswi OpenFOAM Running, Solving & CFD 5 August 23, 2007 04:41
About interface,interior,internal cfdfans FLUENT 7 March 16, 2001 22:23


All times are GMT -4. The time now is 19:32.