[lukasf]

Hi Foamers,

How can I assign neighboring patches in the meshDict when I want to use cyclic boundary conditions?


If I have to apply cyclicAMI I would also like to know how to set the transform and separation vector in the meshDict.


Here are my steps:


I created the geometry (.stl) file with ICEM.
The renameBoundary dictionary in the meshDict looks like this:

renameBoundary
{
    newPatchNames
    {     
        "OUTLET"
        {
                newName OUTLET;
                type    cyclic;
                neighbourPatch INLET;
        }            
        "INLET"
        {
                newName INLET;
                type    cyclic;
                neighbourPatch OUTLET;                                
        }            
            
        "WALL"
        {
                newName WALL;
                type    wall;
        }            
    }
}

or it looks like this if cyclicAMI boundary is desired:

renameBoundary
{
    newPatchNames
    {
            
        "OUTLET"
        {
                newName OUTLET;
                type cyclicAMI;
                neighbourPatch INLET;
                transform       translational;
                separationVector (0 0 -0.032);
        }            
        "INLET"
        {
                newName INLET;
                type cyclicAMI;
                neighbourPatch OUTLET;
                transform       translational;
                separationVector (0 0 0.032);                                
        }            
            
        "WALL"
        {
                newName WALL;
                type    wall;
        }            
    }
}

Afterwards I apply the cartesianMesh command.

I am noticing that cfMesh ignores the neighbourPatches and the other parameters if cyclicAMI is used. The boundary file in constant/polyMesh/boundary does not contain the other parameters of the dictionary. Hence, it would have to be manually added.

    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

3
(
OUTLET
{
    type cyclicAMI;
    nFaces 2502;
    startFace 1567898;
}

INLET
{
    type cyclicAMI;
    nFaces 2502;
    startFace 1570400;
}

WALL
{
    type wall;
    nFaces 47088;
    startFace 1572902;
}
)

Any help is very much appreciated,

Lukas

[Krao]

Hi Lukas,

Old thread, I hope you have found a way. The best way is to leave these cyclic as patch and later you can use createPatchDict to define them. This would be more elegant than manually editing.

Krao