[wanxlxg]

Hallo,
i am woking on the simulation of flow around a 3D cylinder. I have set cyclic BC at the x,y,z,directions.But i get always the "FOAM FATAL ERROR" It says

"in file lnInclude/AMIInterpolation.C at line 146
    Source and target patch bounding boxes are not similar
source box span     : (0.01 0 0.01)
    target box span     : (0.01 0 0.01)
    source box          : (0 0.01 0) (0.01 0.01 0.01)
    target box          : (0 -0.01 0) (0.01 -0.01 0.01)
    inflated target box : (-0.000707107 -0.0107071 -0.000707107) (0.0107071 -0.00929289 0.0107071)
"

could someone please help me?

my casefile is too large to upload, if someone need it ,i will send per Email

thanks.

[wyldckat]

Greetings wanxlxg and welcome to the forum!

It should be enough if you share the file "constant/polyMesh/boundary".
In the mean time, I wrote something about cyclic how to define patches here: http://www.cfd-online.com/Forums/ope...tml#post398703 post #12

Best regards,
Bruno

[wanxlxg]

Originally Posted by wyldckat

Greetings wanxlxg and welcome to the forum!

It should be enough if you share the file "constant/polyMesh/boundary".
In the mean time, I wrote something about cyclic how to define patches here: http://www.cfd-online.com/Forums/ope...tml#post398703 post #12

Best regards,
Bruno

I share the boundary file here.

7
(
    INLET
    {
        type            cyclicAMI;
        nFaces          326;
        startFace       305782;
        matchTolerance  0.0001;
        neighbourPatch  OUTLET;
        transform       translational;
        separationVector (0.01 0 0);
    }
    OUTLET
    {
        type            cyclicAMI;
        nFaces          326;
        startFace       306108;
        matchTolerance  0.0001;
        neighbourPatch  INLET;
        transform       translational;
        separationVector (-0.01 0 0);
    
    }
    TOP
    {
        type            cyclicAMI;
        nFaces          326;
        startFace       306434;    
       matchTolerance  0.0001;
       neighbourPatch  DOWN;
       transform       translational;
        separationVector (0 0.01 0);
    }
    DOWN
    {
        type            cyclicAMI;
        nFaces          323;
        startFace       306760;
        matchTolerance  0.0001;
        neighbourPatch  TOP;
        transform       translational;
        separationVector (0 -0.01 0);
    }
    FRONT
    {
        type            cyclicAMI;
        nFaces          323;
        startFace       307083;
        matchTolerance  0.0001;
        neighbourPatch  BACK;
        transform       translational;
        separationVector (0 0 0.01);
    }
    BACK
    {
        type            cyclicAMI;
        nFaces          324;
        startFace       307406;
        matchTolerance  0.0001;
        neighbourPatch  FRONT;
        transform       translational;
        separationVector (0 0 -0.01);
    }
    KUGEL
    {
        type            wall;
        nFaces          16144;
        startFace       307730;
    }
)

thanks for your help

[wyldckat]

Hi wanxlxg,

Remember the message you shared in the first post? It had this message:

Source and target patch bounding boxes are not similar

On your "boundary" file, it indicates that the number of faces on the patches is not the same on both sides. That is why your getting that error message.
You can try the example from the tutorial "incompressible/pimpleDyMFoam/propeller", which has this:

    AMI1
    {
        type            cyclicAMI;
        nFaces          22416;
        startFace       1733766;
        matchTolerance  0.0001;
        neighbourPatch  AMI2;
        transform       noOrdering;
    }
    AMI2
    {
        type            cyclicAMI;
        nFaces          22416;
        startFace       1756182;
        matchTolerance  0.0001;
        neighbourPatch  AMI1;
        transform       noOrdering;
    }

Notice the:

transform       noOrdering;

Best regards,
Bruno

[wanxlxg]

Hallo,

i tried your suggestions,but the Error is still there.
i post here my model
so you can see what i am simulating
i think the tansfom typ--translation is better for my model
please check the separationVector for me,did i set it right?
x 0 to 0.01
y 0 to 0.01
z 0 to 0.01

transform       translational;
separationVector (0 0.01 0);

[wyldckat]

Hi wanxlxg,

There is a tutorial in OpenFOAM that shows that same cube-shaped geometry with cyclics all over the place.... it's "DNS/dnsFoam/boxTurb16": https://github.com/OpenFOAM/OpenFOAM...Foam/boxTurb16

Best regards,
Bruno

[wanxlxg]

Originally Posted by wyldckat

Hi wanxlxg,

There is a tutorial in OpenFOAM that shows that same cube-shaped geometry with cyclics all over the place.... it's "DNS/dnsFoam/boxTurb16": https://github.com/OpenFOAM/OpenFOAM...Foam/boxTurb16

Best regards,
Bruno

P { margin-bottom: 0.21cm; } Hallo Bruno,
have seen your post and also checked the example you said.And i have a new question about that old problem.

For patch TOP there are 326 face centres, for the neighbour patch DOWN there are 323

In my case i must use the unstructured grid, therefor i have different nFace number in the TOP and DOWN Face. Is there a solution, i keep my grid and able to use the cyclic boundary?

thanks for your help.

wan

[wyldckat]

Hi Wan,

Have you tried what I said in post #4?

Best regards,
Bruno