[Owais Shabbir]

Dear Community,



I am very basic user of snappyHexMesh, I am curious if in SnappyHexMesh (SHM) symmetry is possible. I am trying to generate a mesh for two identical batteries placed in a domain. A schematic picture is attached (sorry due to confidentiality I can't post the real picture).

My job is to mesh the whole domain but due to the complex geometries of the batteries I just want to mesh half of the domain and by using some tools (mergeMesh stitchMesh) or by just using some symmetric boundary conditions I could simulate the flow for the whole domain.



Thanks
Owais

[dasith0001]

Hi,

Probably too late now, but if anybody else is looking, you can add the symmetry boundary condition under 'refinementSurfaces' at the required boundary as,

patchInfo
{
type symmetry;
}

Dasith

[otaolafr]

Originally Posted by dasith0001

Hi,

Probably too late now, but if anybody else is looking, you can add the symmetry boundary condition under 'refinementSurfaces' at the required boundary as,

patchInfo
{
type symmetry;
}

Dasith

hello Dasith,
I might be incorrect but if i remember correctly you can not use symmetry in the refimenetSurfaces in snappy as any other constraint type boundary (i.e. symmetry, symmetryPlane, cyclic, clyclicAMI).
what I do myself is create a dummy patch e.g. symm_1 with a patch type and then with createPatchDict transform it into sym_1 with a symmetry type.
like this example of createPatchDict:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2012                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      createPatchDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

pointSync false;

patches
(

		{
        name            sym_1;
        patchInfo
        {
            type            symmetry;
        }
        constructFrom patches;
        patches (symm_1);
    }
);

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

then I run

createPatch	-overwrite

best regards,
F.