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Old   October 19, 2018, 09:23
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Christophk
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Hello,

I just started using OpenFoam. I tried to use an old simulation, which runs into an error, using cyclic for boundary conditions:


--> FOAM FATAL IO ERROR:
Old-style cyclic definition. Splitting patch fan into two halves fan_half0 and fan_half1
Alternatively use new 'boundary' dictionary syntax.

file: /opt/openfoam6/src/OpenFOAM/root-6/run/fan/constant/polyMesh/blockMeshDict.patches at line 90.

From function void Foam::blockMesh::readPatches(const Foam::dictionary&, Foam::faceListList&, Foam::wordList&, Foam::wordList&, Foam::wordList&)
in file blockMesh/blockMeshTopology.C at line 206.

Does anyone have any idea, what I should do?

Thanks for help.
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Old   October 21, 2018, 10:53
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Does really noone have any idea?
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Old   October 22, 2018, 11:52
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Lee Strobel
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I don't have a lot of experience with OpenFOAM, but will try to help if I can.


Firstly, what operation are you trying to perform, when you get that message?


Form the error message, it looks like it something to do with the boundary conditions and/or the mesh. Have you tried re-meshing? If so, perhaps see if it will work with some alternative boundary conditions.
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Old   October 23, 2018, 00:42
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Peter Baskovich
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Hi Cristoph,
Could you provide the blockMeshDict you are trying to run? It seems that the way to define cyclic patches has changed between the old case you are trying to run and the new OF environment.
It is always helpful around here to mention which version exactly you are running as there can be differences in implementations and available functionality.
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Old   October 24, 2018, 09:16
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Christophk
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blockmeshdict:

/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.2 |
| \\ / A nd | Web: http://www.openfoam.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/

FoamFile
{
version 2.0;
format ascii;

root "";
case "";
instance "";
local "";

class dictionary;
object blockMeshDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

x0 0.0;
x1 4.0;
x2 4.0;
x3 8.0;

y0 0.0;
y1 1.0;

z0 0.0;
z1 0.5;

vertices
(
( $x0 $y0 $z0 )
( $x1 $y0 $z0 )
( $x1 $y1 $z0 )
( $x0 $y1 $z0 )
( $x0 $y0 $z1 )
( $x1 $y0 $z1 )
( $x1 $y1 $z1 )
( $x0 $y1 $z1 )
( $x2 $y0 $z0 )
( $x3 $y0 $z0 )
( $x3 $y1 $z0 )
( $x2 $y1 $z0 )
( $x2 $y0 $z1 )
( $x3 $y0 $z1 )
( $x3 $y1 $z1 )
( $x2 $y1 $z1 )
);

blocks
(
hex ( 0 1 2 3 4 5 6 7 ) upstream ( 40 10 5 ) simpleGrading ( 1 1 1 )
hex ( 8 9 10 11 12 13 14 15 ) upstream ( 40 10 5 ) simpleGrading ( 1 1 1 )
);

boundary
(
inlet
{
type patch;
faces
(
( 0 4 7 3 )
);
}
outlet
{
type patch;
faces
(
( 9 10 14 13 )
);
}
walls
{
type wall;
faces
(
( 0 1 2 3 )
( 8 9 10 11 )
( 0 1 5 4 )
( 8 9 13 12 )
( 4 5 6 7 )
( 12 13 14 15 )
( 3 7 6 2 )
( 11 15 14 10 )
);
}

fan_half0
{
type cyclic;
neighbourPatch fan_half1;
faces
(
( 1 2 6 5 )
);
}
fan_half1
{
type cyclic;
neighbourPatch fan_half0;
faces
(
( 8 12 15 11 )
);
}

);

mergePatchPairs
(
);

I changed the file, so the meshing works now. The solver requests a turbulenceproperties file now, and I tried to run with kOmegaSST, but then I need a nut-File.
If I tried to copy that as well from tutorials/lagrangian/reactingParcelFoam/verticalChannelLTS/0 it searches for a patchType inlet, which doesn't exists here. I'm not really sure how to change the nut-file.
The working U-file looks like this :


FoamFile
{
version 2.0;
format ascii;
class volVectorField;
location "0";
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform ( 1 0 0 );

boundaryField
{
inlet
{
type pressureInletVelocity;
phi phi;
value uniform ( 0 0 0 );
}
outlet
{
type inletOutlet;
inletValue uniform ( 0 0 0 );
value uniform ( 0 0 0 );
}
walls
{
type fixedValue;
value uniform ( 0 0 0 );
}
fan_half0
{
type cyclic;
}
fan_half1
{
type cyclic;
}
}

The nut-File loks like this now:

FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object nut;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -1 0 0 0 0];

internalField uniform 0;

boundaryField
{
back
{
type symmetryPlane;
}
front
{
type symmetryPlane;
}
inletCentral
{
type calculated;
value uniform 0;
}
inletSides
{
type calculated;
value uniform 0;
}
outlet
{
type calculated;
value uniform 0;
}
walls
{
type nutkWallFunction;
Cmu 0.09;
kappa 0.41;
E 9.8;
value uniform 0;
}
fan_half0
{
type cyclic;
}
fan_half1
{
type cyclic;
}
}

I'm sorry if I did some obvious mistakes and can't see them, since I am new to this stuff.
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Old   February 19, 2020, 08:15
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Gerhard
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Hi Christoph,


You just need to use the same boundary names in the nut-file, i.e. inlet, outlet, walls, fan_half0, fan_half1.
Then assign the correct types etc., which you can get an idea of in the tutorial files etc.


Get rid of the front, back, and those things that do not correspond to the boundaries in the U-file.


Regards.
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