CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Pre-Processing

Internalls walls

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 20, 2007, 06:39
Default hi everybody i try to crea
  #1
rengu
Guest
 
Posts: n/a
hi everybody

i try to create internalls walls in OF thanks to this thread: http://openfoamwiki.net/index.php/Howto_importing_fluent_mesh_with_internal_wall s

i create my mesh with gambit but when i convert fluent mesh to openfoam it say me "Patch internal is internal to the mesh and is not being added to the boundary." but it don't create a set to use after splitmesh
what am i doing wrong?
what is the easy way to create a faceset ?

bestregards
  Reply With Quote

Old   November 20, 2007, 08:06
Default With the new versions of fluen
  #2
Assistant Moderator
 
Bernhard Gschaider
Join Date: Mar 2009
Posts: 3,915
Rep Power: 40
gschaider will become famous soon enoughgschaider will become famous soon enough
With the new versions of fluentMeshToFoam (1.4+ I think) you have to explicitly trigger the writting of the sets with the -writeSets-option.

It has been asked before here. I will modify the Wiki-page accordingly

Bernhard
__________________
Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request
gschaider is offline   Reply With Quote

Old   November 20, 2007, 08:24
Default thanks bernhard
  #3
rengu
Guest
 
Posts: n/a
thanks bernhard
  Reply With Quote

Old   November 20, 2007, 08:47
Default sorry but i have got this erro
  #4
rengu
Guest
 
Posts: n/a
sorry but i have got this error

Create polyMesh for time = 0

#0 Foam::error::printStack(Foam:stream&) in "/home/gui/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#1 Foam::sigSegv::sigSegvHandler(int) in "/home/gui/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#2 Uninterpreted: [0xffffe420]
#3 Foam::polyMesh::initMesh() in "/home/gui/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#4 Foam::polyMesh::polyMesh(Foam::IOobject const&) in "/home/gui/OpenFOAM/OpenFOAM-1.4.1/lib/linuxGccDPOpt/libOpenFOAM.so"
#5 main in "/home/gui/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/splitMesh"
#6 __libc_start_main in "/lib/tls/i686/cmov/libc.so.6"
#7 Foam::regIOobject::write() const in "/home/gui/OpenFOAM/OpenFOAM-1.4.1/applications/bin/linuxGccDPOpt/splitMesh"
Erreur de segmentation (core dumped)

i suppose it's because startface like it say in the wiki
What mean "current number of faces" for the startface on the wiki?where i can found it?

best regards
  Reply With Quote

Old   November 20, 2007, 08:59
Default Have a look at the faces-file
  #5
Assistant Moderator
 
Bernhard Gschaider
Join Date: Mar 2009
Posts: 3,915
Rep Power: 40
gschaider will become famous soon enoughgschaider will become famous soon enough
Have a look at the faces-file in polyMesh. At the start of the list it says how many faces are in the list. This is the "current number of faces". Use it for the startFace.
__________________
Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request
gschaider is offline   Reply With Quote

Old   November 20, 2007, 10:04
Default Alternatively, you can try to
  #6
Senior Member
 
Francesco Del Citto
Join Date: Mar 2009
Location: Zürich Area, Switzerland
Posts: 215
Rep Power: 9
fra76 is on a distinguished road
Alternatively, you can try to use fluent3DMeshToFoam shipped with OF 1.4.1.
If the internal walls are correctly set up in Fluent (i.e., with a Shadow face), it should be able to convert the mesh.

Francesco
fra76 is offline   Reply With Quote

Old   December 5, 2007, 09:35
Default Hi! I have a GAMBIT mesh wi
  #7
New Member
 
Mads Reck
Join Date: Mar 2009
Posts: 17
Rep Power: 8
gabriel_stokes is on a distinguished road
Hi!

I have a GAMBIT mesh with internal walls. I have exported it to a Fluent .msh file, which reads nicely into Fluent. I want it into OpenFOAM. It works beautifully if I do nothing, but naturally the internal walls are missing from the simulation. So,

I did the fluentMeshToFoam . <case> <meshfile.msh> -writeSets

fluentMeshToFoam recognises the internal walls but skips them, as noted by the original poster: "Patch internal is internal to the mesh and is not being added to the boundary."

I have multiple internal walls, defined as separate BC's in Gambit. I am trying to just get one of them active. So, in the boundary-file I add two entries:

InternalA
{
type wall;
nFaces A;
startFace B;
}

InternalB
{
type wall;
nFaces A;
startFace B;
}

I do not think that the question of what values to put A and B to, is clearly defined anywhere, or in the wiki. It is not clear to ignorant little me, at least.

I run the command splitMesh . <case> <gambit_bc_name> InternalA InternalB and it gives various error messages, depending on what values A and B have. Hence I have some questions, and please be accurate and comprehensible :-)


Question 1: I guess A and B has to be the same in InternalA and in InternalB, right?
Question 2: what should A be set to?
Question 3: what should B be set to?

I tried to set A to the first number which occurs in the sets/<gambit_bc_name> file. Makes no sense to me, as splitMesh should be able to read this number.

I tried to set B to the first number which occurs in the faces-file (just after the header). I believe this is the total face count. Makes no sense to me, why I should be using that number, as it should be available to splitMesh already from the faces-file.


Makes no sense, meaning that I do not understand at all what numbers should go in A and B.

Any help is greatly appreciated, thanks a bunch!

/Mads




I got a sets-directory in my polyMesh directory.
gabriel_stokes is offline   Reply With Quote

Old   December 5, 2007, 09:54
Default Hi Mads, Have you tried flu
  #8
caw
Member
 
Christian Winkler
Join Date: Mar 2009
Location: Mannheim, Germany
Posts: 63
Rep Power: 8
caw is on a distinguished road
Hi Mads,

Have you tried fluent3DMeshToFoam, this should do it.

Best regards
Christian
caw is offline   Reply With Quote

Old   December 6, 2007, 04:51
Default Hi Christian, fluent3dMeshT
  #9
New Member
 
Mads Reck
Join Date: Mar 2009
Posts: 17
Rep Power: 8
gabriel_stokes is on a distinguished road
Hi Christian,

fluent3dMeshToFoam never worked for me. But, slightly embarrassed I admit, that fluentMeshToFoam now works, it seems. Well, actually it still breaks, but now it ends on "new cannot satisfy memory request". The mesh is probably too big. I have plenty of RAM so I wonder if changing to the 64bit version will alleviate this...?

Just, to clarify, since I may have caused some confusion, entries in the boundary file should read something like this:

InternalA
{
type wall;
nFaces 0;
startFace <facecount>;
}

InternalB
{
type wall;
nFaces 0;
startFace <facecount>;
}

where <facecount> is the total number of faces, found in the file ./<case>/constant/polyMesh/faces as the first entry after the header.

I have two follow-up questions, then.

Q1: will 64-bit version alleviate the memory limit-issue?
Q2: is fluent3DMeshToFoam the preferred choice?

Thanks!

/Mads
gabriel_stokes is offline   Reply With Quote

Old   December 6, 2007, 10:35
Default I had the same problem - I sho
  #10
Member
 
Paul Mauk
Join Date: Mar 2009
Posts: 39
Rep Power: 8
plmauk is on a distinguished road
I had the same problem - I should import a fluent-mesh with an internal wall. This never worked with fluentMeshToFoam, but after reading these messages I've tried fluent3DMeshToFoam - and I have to confirm - it works perfectly!!
plmauk is offline   Reply With Quote

Old   December 10, 2007, 06:14
Default A quick hint on having multipl
  #11
New Member
 
Mads Reck
Join Date: Mar 2009
Posts: 17
Rep Power: 8
gabriel_stokes is on a distinguished road
A quick hint on having multiple internal walls (i.e. defined in each own BC set)?

Do I run splitMesh multiple times or do I have to include all internals in one BC set in Gambit?

/Mads
gabriel_stokes 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
Use wall function on some walls (not all walls) Mahdi10 FLUENT 1 February 16, 2009 12:52
HTC for low Y+ walls Tang FLUENT 0 March 15, 2007 16:55
how to cluster walls prc CD-adapco 2 December 26, 2006 04:56
too many walls?? matze CD-adapco 2 March 1, 2006 08:13
Thermal B.C at walls Riham FLUENT 3 January 27, 2004 14:57


All times are GMT -4. The time now is 00:13.