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

how to create cyclic from 2 boundaries in Openfoam 1.7.1

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 10, 2012, 07:19
Default how to create cyclic from 2 boundaries in Openfoam 1.7.1
  #1
New Member
 
Join Date: Jun 2011
Posts: 1
Rep Power: 0
vsflap is on a distinguished road
Hi everyone,

I wonder if you could help me please with the problem concerning cyclic boundary with OpenFOAM 1.7.1.

I have a quite simple geometry for an airfoil and would like to set up periodic boundary conditions on the 2 vertical boundaries. I'm trying to create the periodic boundary from 2 boundaries (''wall'') with createPatch but I've got errors:

Moving faces from patch new_wall0 to patch 7
Moving faces from patch new_wall1 to patch 7

Doing topology modification to order faces.

cyclicPolyPatch:rder : Writing half0 faces to OBJ file "new_wall_half0_faces.obj"
cyclicPolyPatch:rder : Writing half1 faces to OBJ file "new_wall_half1_faces.obj"
cyclicPolyPatch:rder : Dumping currently found cyclic match as lines between corresponding face centres to file "new_wall_faceCentres.obj"
--> FOAM Serious Error :
From function cyclicPolyPatch:rder(const primitivePatch&, labelList&, labelList&) const
in file meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C at line 1566
Patch:new_wall : Cannot match vectors to faces on both sides of patch
Perhaps your faces do not match? The obj files written contain the current match.
Continuing with incorrect face ordering from now on!


--> FOAM FATAL ERROR:
face 5240 area does not match neighbour 133908 by 0.00101172% -- possible face ordering problem.
patch:new_wall my area:0.000254184 neighbour area:0.000254182 matching tolerance:1e-05
Mesh face:264077 vertices:4((-0.0707825 -0.9 0.03) (-0.068948 -0.9 0.03) (-0.068948 -0.761442 0.03) (-0.0707825 -0.761442 0.03))
Neighbour face:392745 vertices:4((-0.0707827 -0.9 0) (-0.0707827 -0.761442 0) (-0.0689482 -0.761442 0) (-0.0689482 -0.9 0))
Rerun with cyclic debug flag set for more information.

From function cyclicPolyPatch::calcTransforms()
in file meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C at line 179.

FOAM exiting

thanks
vsflap is offline   Reply With Quote

Old   April 25, 2013, 05:58
Default
  #2
New Member
 
Join Date: Apr 2013
Posts: 6
Rep Power: 4
shadowfax is on a distinguished road
Quote:
Originally Posted by vsflap View Post
Hi everyone,

I wonder if you could help me please with the problem concerning cyclic boundary with OpenFOAM 1.7.1.

I have a quite simple geometry for an airfoil and would like to set up periodic boundary conditions on the 2 vertical boundaries. I'm trying to create the periodic boundary from 2 boundaries (''wall'') with createPatch but I've got errors:

Moving faces from patch new_wall0 to patch 7
Moving faces from patch new_wall1 to patch 7

Doing topology modification to order faces.

cyclicPolyPatch:rder : Writing half0 faces to OBJ file "new_wall_half0_faces.obj"
cyclicPolyPatch:rder : Writing half1 faces to OBJ file "new_wall_half1_faces.obj"
cyclicPolyPatch:rder : Dumping currently found cyclic match as lines between corresponding face centres to file "new_wall_faceCentres.obj"
--> FOAM Serious Error :
From function cyclicPolyPatch:rder(const primitivePatch&, labelList&, labelList&) const
in file meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C at line 1566
Patch:new_wall : Cannot match vectors to faces on both sides of patch
Perhaps your faces do not match? The obj files written contain the current match.
Continuing with incorrect face ordering from now on!


--> FOAM FATAL ERROR:
face 5240 area does not match neighbour 133908 by 0.00101172% -- possible face ordering problem.
patch:new_wall my area:0.000254184 neighbour area:0.000254182 matching tolerance:1e-05
Mesh face:264077 vertices:4((-0.0707825 -0.9 0.03) (-0.068948 -0.9 0.03) (-0.068948 -0.761442 0.03) (-0.0707825 -0.761442 0.03))
Neighbour face:392745 vertices:4((-0.0707827 -0.9 0) (-0.0707827 -0.761442 0) (-0.0689482 -0.761442 0) (-0.0689482 -0.9 0))
Rerun with cyclic debug flag set for more information.

From function cyclicPolyPatch::calcTransforms()
in file meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C at line 179.

FOAM exiting

thanks
Hi vsflap,

I am also having a similar problem. Were you able to figure out the solution ? It would be very helpful to me
shadowfax is offline   Reply With Quote

Old   April 25, 2013, 10:41
Default
  #3
Member
 
M Mallikarjuna Reddy
Join Date: Jul 2012
Posts: 91
Rep Power: 5
mmkr825 is on a distinguished road
Hi vsflap,
I think you made some mistake in defining cyclic BC. In my case i used it for straight channel where inlet and outlet are my periodic BCs. I defined as follows:

Quote:
leftWall
{
type cyclic;
neighbourPatch rightWall;
faces
(
(0 4 7 3)
);
}
rightWall
{
type cyclic;
neighbourPatch leftWall;
faces
(
(2 6 5 1)
);
}
Hope this will help

Regards
Reddy
mmkr825 is offline   Reply With Quote

Old   April 25, 2013, 10:47
Default
  #4
New Member
 
Join Date: Apr 2013
Posts: 6
Rep Power: 4
shadowfax is on a distinguished road
Hi Reddy,

I figured out the problem, it was in the grid definition in blockmeshdict. It works now
Also, can you tell me what boundary conditions did you use for p and U ?
I am trying to use the fan bc, but haven't figured it out yet. I have a laminar flow in a rectangular channel with a cylinder inside it.

Thanks!
shadowfax is offline   Reply With Quote

Old   April 26, 2013, 03:30
Default
  #5
Member
 
M Mallikarjuna Reddy
Join Date: Jul 2012
Posts: 91
Rep Power: 5
mmkr825 is on a distinguished road
Dear Shadowfax
I used cyclic type BC for p and U.
For p:
Code:
leftWall
    {
        type            cyclic;
        nFaces          40;
        startFace       157960;
        matchTolerance  0.0001;
        neighbourPatch  rightWall;
    }
    fixedWalls
    {
        type            zeroGradient;
    }
    rightWall
    {
        type            cyclic;
        nFaces          40;
        startFace       162000;
        matchTolerance  0.0001;
        neighbourPatch  leftWall;
    }
    frontAndBack
    {
        type            empty;
    }
For U:
Code:
leftWall
    {
        type            cyclic;
        nFaces          40;
        startFace       157960;
        matchTolerance  0.0001;
        neighbourPatch  rightWall;
    }
    fixedWalls
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    rightWall
    {
        type            cyclic;
        nFaces          40;
        startFace       162000;
        matchTolerance  0.0001;
        neighbourPatch  leftWall;
    }
    frontAndBack
    {
        type            empty;
    }
Regards
M Reddy
mmkr825 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
Wrong wall distance with cyclic boundaries sebastian OpenFOAM Bugs 4 October 31, 2012 11:24
Compatibility OpenFOAM 1.6 and 1.7.1 Ale_galleria OpenFOAM 2 September 20, 2010 09:14
Cross-compiling OpenFOAM 1.7.0 on Linux for Windows 32 and 64bits with Mingw-w64 wyldckat OpenFOAM Announcements from Other Sources 3 September 8, 2010 06:25
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
create a hardcopy of boundaries in batch mode Fab CD-adapco 4 January 8, 2007 05:21


All times are GMT -4. The time now is 21:01.