[saeed jamshidi]

Hello,

I have seen frequently toposetDict in the tutorials,but I don't know exactly what is the application of it?!
So, I have attached a sample here:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2112                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      topoSetDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

actions
(
    
    {
        name    inner;
        type    cellZoneSet;
        action  new;
        source  boxToCell;
        min     (-1 -0.5 0);
        max     ( 6  0.5 2);
    }
);


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

I would appreciate it if you assist me with providing some information.\
Thanks.

[NotOverUnderated]

topoSet utility is used to create cellSets, cellZones, faceSets, etc.

Check this answer for details about these sets: cellZone-cellSet

I hope this helps

[saeed jamshidi]

NotOverUnderated, thanks for the reply.

I couldn't understand the application of that, could you provide more details?😅

[Yann]

Hello Saeed,

There is not a single answer to your question.
Sometimes you need a way to get data or to apply a specific treatment to a selection of cells, faces, points... This is what cellZone, cellSet, faceZone etc... are meant for.

For instance, in function objects, faceZone can be used to compute surface field values: https://doc.openfoam.com/2306/tools/...aceFieldValue/.
Same thing with cellZone for volume field values (https://doc.openfoam.com/2306/tools/...volFieldValue/)

fvOptions feature allows to add source terms which are often applied on cellZones: https://doc.openfoam.com/2306/tools/...ions/sources/#

Dynamic mesh also often use cellZones in order to define which part of the mesh is supposed to move. For instance on the propeller tutorial: https://develop.openfoam.com/Develop...ref_type=heads

Those are only random examples, there might be a lot of other features using these entities. When you bump into topoSetDict in a tutorial, have a look at what entities it creates and search where these entities are used in the case setup.
Also please note these entities are not always created with the topoSet utility. For instance you can define cellZone/faceZone in snappyHexMeshDict.

Yann

[saeed jamshidi]

I got it. Thank you for your help.