CFD Online Discussion Forums - [Commercial meshers] createBaffles for fluent3DMeshToFoam

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- - [Commercial meshers] createBaffles for fluent3DMeshToFoam (https://www.cfd-online.com/Forums/openfoam-meshing/124466-createbaffles-fluent3dmeshtofoam.html)

createBaffles for fluent3DMeshToFoam

Dear Foamers

I want to define an interior plane inside my domain for my inlet boundary condition (for using mappedVelocityFlux B.C. we need an interior patch). I searched the whole forums and found that there is no such a concept in OpenFOAM. one way is to create a cyclic baffle (createBaffles).
I've also studied all the posts regarding createBaffles and also all the tutorials in openFoam:

Code:

find $FOAM_TUTORIALS -name Allrun | xargs grep -sl createBaffles

which are:

Code:

/opt/openfoam211/tutorials/heatTransfer/buoyantSimpleFoam/circuitBoardCooling/Allrun

/opt/openfoam211/tutorials/incompressible/pimpleFoam/TJunctionFan/Allrun

/opt/openfoam211/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/filter/Allrun

/opt/openfoam211/tutorials/multiphase/interFoam/ras/damBreakPorousBaffle/Allrun

in order to use the createBaffles utility we need to define 2 cyclic patches and a faceZone to use the following command:

Code:

createBaffles [OPTIONS] <faceZone> <(masterPatch slavePatch)>

All the tutorials use blockMeshDict and topoSetDict for this purpose.
But I generated my mesh in Gambit so I can not define the required boxes that are needed by topoSetDict.
I defined an interior plane in Gambit. then export it to OpenFOAM using fluent3DMeshToFoam. the interior plane converted to faceZone automatically. so I have a faceZone that is needed for createBaffles. I also need 2 cyclic patches too. I added them manually into my boundary

Code:

type cyclic;

nFaces 0;

startFace ???;

I don't know how to set startFace?
is there any simpler method for creating a cyclic baffle using Gambit?
can this cyclic baffle be created in Gambit and then be exported to OpenFOAM?

Any help will be appreciated.

I've found that if we manually add two cyclic patches with nFaces=0 into the boundary of polyMesh just like in TJunctionFan:(a cyclic baffle for fan b.c.)

Code:

    fan_half0

    {

        type            cyclic;

        nFaces          0;

        startFace       10125;

        matchTolerance  0.0001;

        neighbourPatch  fan_half1;

    }

    fan_half1

    {

        type            cyclic;

        nFaces          0;

        startFace       10125;

        matchTolerance  0.0001;

        neighbourPatch  fan_half0;

    }

It will also require blockMesh so that these two new patches can be recognoized by OpenFOAM.
I meshed my Geometry in Gambit so I don't have a blockMeshDict.

If I only add the above lines into my boundary without blockMesh , The CheckMesh Gives Error:confused::confused:
What can I do??

Hey,

i am faceing a similar problem at the moment! Did u find a solution to this?

Or to other users, can u give a hint. I imported an external mesh and want to create baffles from faces. How can one do that? thx!!