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Converting a 2Dmesh to axisymmetric

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Old   December 25, 2012, 17:14
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  #141
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Quote:
Originally Posted by rajeshkunwar View Post
What is the difference between new mode and old mode...Pls somebody explain it.
old mode is if you specify axis and wege from the command line and therefor the dictionary is not used. This mode does not allow the axis to have an offset
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Old   December 26, 2012, 01:34
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Hi, Dear rajeshkunwar.
Your question not Clear for me!!!plz Explain more about your question?
maybe i can help you!!!
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Old   December 26, 2012, 01:35
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Hi, Dear rajeshkunwar.
Your question not Clear for me!!!plz Explain more about your question?
maybe i can help you!!!
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Old   December 27, 2012, 04:34
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The axis patch type becomes symmetryPlane after using makeAxialMesh in boundary file of polyMesh directory . What boundary type I have to specify in P and U files for symmetryPlane.
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Old   December 28, 2012, 17:02
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if you done true all steps,you should have Something similar the following lines in your boundary:
frontAndBackPlanes
{
type empty;
}
frontAndBackPlanes_pos
{
type wedge;
}
frontAndBackPlanes_neg
{
type wedge;
}

are you make this lines(wedge) in your boundary in polymesh file?if you see this,so you should add the above lines in P and U files.
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Old   December 29, 2012, 11:26
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Hi Vahid. Thank you for replying. my boundary file is below. The axis patch name is Axis.

FoamFile
{
version 2.0;
format ascii;
class polyBoundaryMesh;
location "constant/polyMesh";
object boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

8
(
Axis
{
type symmetryPlane;
nFaces 0;
startFace 19800;
}
Upper_Boundary
{
type patch;
nFaces 100;
startFace 19800;
}
Side_Boundary
{
type patch;
nFaces 100;
startFace 19900;
}
Bottom_Wall
{
type wall;
nFaces 90;
startFace 20000;
}
Source
{
type patch;
nFaces 10;
startFace 20090;
}
frontAndBackPlanes
{
type empty;
nFaces 0;
startFace 20100;
}
frontAndBackPlanes_pos
{
type wedge;
nFaces 10000;
startFace 20100;
}
frontAndBackPlanes_neg
{
type wedge;
nFaces 10000;
startFace 30100;
}


U file in zero folder is below.
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0.0 0 0);

boundaryField
{
Axis
{
type symmetryPlane;

}
Upper_Boundary
{

type inletOutlet;
inletValue uniform (0 0 0);
value uniform (0 0 0);

}
....


I just wanted to confirm whether it is correct or not.
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Old   December 30, 2012, 02:16
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Hi dear rajeshkunwar .
I havent time to see your boundary,but I know that you have to run this line:

makeAxialMesh -axis axis -wedge frontAndBackPlane

I think, its better for you to learn it, do this Commands for a simple geometry like Rectangular shape!!!
if your problem don't solve,Ask the problem again,to explain it!!!
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Old   January 3, 2013, 03:47
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I have done the same thing what you have suggested. My confusion is regarding the boundary condition of Axis patch.
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Old   January 5, 2013, 19:05
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Quote:
Originally Posted by rajeshkunwar View Post
I have done the same thing what you have suggested. My confusion is regarding the boundary condition of Axis patch.
The type of the axis patch has been rewritten as this usually causes the least problems. If the axis patch was also the rotation axis then collapseEdges should remove all faces there anyway and the type of it is irrelevant. Otherwise if you don't like symmetryPlane go to constant/polymesh/boundary and change it there
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Old   January 11, 2013, 10:25
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Hi all,

where can i download makeAxialMesh for openFoam 2.1.0? svn doesn't work.

thanks

andrea
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Old   January 11, 2013, 10:52
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Quote:
Originally Posted by Andrea_85 View Post
Hi all,

where can i download makeAxialMesh for openFoam 2.1.0? svn doesn't work.
The SVN has been temporarily disabled by Sourceforge because ANSYS claims that 6 files (out of thousands) there violate their copyright.

I will look into how to make stuff that is undisputed available in the meantime, but probably can't do so before monday

If somebody who recently downloaded it (makeAxialMesh) could make a tarball of the source and make it available to the public (for instance on the Wiki) that would be great
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Old   January 14, 2013, 07:41
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HI Bernhard,

if you can just copy here makeAxialMesh.C that compiles on OF 2.1.0 i can easily do the rest. I cannot find the source code.

Thanks
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Old   January 14, 2013, 08:59
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Quote:
Originally Posted by Andrea_85 View Post
HI Bernhard,

if you can just copy here makeAxialMesh.C that compiles on OF 2.1.0 i can easily do the rest. I cannot find the source code.

Thanks
Just added a tar to the MAM-page on the Wiki
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Old   January 14, 2013, 10:07
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thank you very much!

best
andrea
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Old   June 7, 2013, 07:07
Question problem with makeAxialMesh
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hi bernhard,

I am new to openfoam and i am facing few problems with using makeAxialMesh for a simple case of laminar flow thru a 2D axisymmetric pipe, can you please point out the probleam in my case setup since i am getting boundary layer even at the axis(as in the attached fig.).
Attached Images
File Type: jpg velocity-mag.jpg (18.5 KB, 15 views)
Attached Files
File Type: zip laminar.zip (7.0 KB, 3 views)
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Old   June 7, 2013, 11:22
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Quote:
Originally Posted by shash View Post
hi bernhard,

I am new to openfoam and i am facing few problems with using makeAxialMesh for a simple case of laminar flow thru a 2D axisymmetric pipe, can you please point out the probleam in my case setup since i am getting boundary layer even at the axis(as in the attached fig.).
Did you remove the patch with collapseEdges? And even if it is there: what are the boundary conditions on it?
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Old   June 7, 2013, 13:49
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Quote:
Originally Posted by gschaider View Post
Did you remove the patch with collapseEdges? And even if it is there: what are the boundary conditions on it?
these are Cyclic . why collapseEdge ? can you explain , please
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Old   June 7, 2013, 15:17
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hi bernhard,

no i have not used collapseEdges, i simply gave these terminal commands
blockMesh
makeAxialMesh -axis center -wedge frontAndBack
icoFoam >& log

after running makeAxialMesh , a folder was formed from which i copied the polymesh dir. and replaced with the original.

my original blockMeshDict

convertToMeters 0.01;

vertices
(
(0 -1 0)
(5 -1 0)
(5 1 0)
(0 1 0)
(0 -1 2)
(5 -1 2)
(5 1 2)
(0 1 2)
);

blocks
(
hex (0 1 2 3 4 5 6 7) (100 40 1) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
inlet
{
type patch;
faces
(
(0 4 7 3)
);
}

outlet
{
type patch;
faces
(
(2 6 5 1)
);
}

fixedWalls
{
type wall;
faces
(
(3 7 6 2)
);
}

center
{
type empty;
faces
(
(1 5 4 0)
);
}

frontAndBack
{
type empty;
faces
(
(0 3 2 1)
(4 5 6 7)
);
}
);

mergePatchPairs
(
);

and 0/u :

internalField uniform (0 0 0);

boundaryField
{
outlet
{
type zeroGradient;
}

inlet
{
type fixedValue;
value uniform (0.05 0 0);
}


fixedWalls
{
type fixedValue;
value uniform (0 0 0);
}

center
{
type symmetryPlane;
}

frontAndBack
{
type empty;
}
frontAndBack_pos
{
type wedge;
}
frontAndBack_neg
{
type wedge;
}


I am also not very sure about the parameters in rotationDict (attached).

Will be grateful for ur help.
Attached Files
File Type: zip rotationDict.zip (686 Bytes, 1 views)
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Old   June 8, 2013, 11:52
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Quote:
Originally Posted by shash View Post
no i have not used collapseEdges,
You should have. That's why it is the last thing makeAxialMesh talks about it before it ends
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Old   June 17, 2013, 06:35
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hi bernhard,

I am sorry , i didn't go thru prevoius threads. Thanks a lot for ur answer now its up and running, I also wanted to confirm something, thou collapseEdges 1e-06 175 command after makeaxialmesh worked for me on OF ver 2.1 but a friend of mine is getting troubles running the same command collapseEdges 1e-06 175 for same case on OF ver 2.2, whats the reason for that, its showing required 0 argument, 2 given
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