[vbesteban]

Hi.

I'm working in a propeller simulation. But I have several problems to create my cellZones dict to generate the rotation in my case.

I'm working with simpleFoam, and generate the rotation with MRFZones in my fvOptions dict in System folder, but I don't really know how to create my cellZones.

I've already generated my mesh in salome, and then exported into OF, but this export doesn't generate any cellZone. In salome I just generate a mesh waiting for create my cellzones in OF. I'm looking for rotate the propeller.

I attach the file of my case.

https://www.dropbox.com/s/nu6d9v4fsm...er.tar.gz?dl=0

[vbesteban]

An additional comment, I'm using OF 2.3

[spikespigel]

Originally Posted by vbesteban

Hi.

I'm working in a propeller simulation. But I have several problems to create my cellZones dict to generate the rotation in my case.

I'm working with simpleFoam, and generate the rotation with MRFZones in my fvOptions dict in System folder, but I don't really know how to create my cellZones.

I've already generated my mesh in salome, and then exported into OF, but this export doesn't generate any cellZone. In salome I just generate a mesh waiting for create my cellzones in OF. I'm looking for rotate the propeller.

I attach the file of my case.

https://www.dropbox.com/s/nu6d9v4fsm...er.tar.gz?dl=0

good afternoon

I have the same problem, could you solve it?

I really appreciate your help

[yewi]

i usually use MRFproperties inside the constant folder instead

it looks something like this

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.x                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      MRFProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

rotor
{
    cellZone    rotor;
    active      yes;

    // Fixed patches (by default they 'move' with the MRF zone)
    nonRotatingPatches ();

    origin    (0 0 0);
    axis      (0 0 1); //axis of rotation
    omega     constant 1047.2; //rotation in rad/s
}


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

also in your snappyHexMeshDict, you can specify this rotating zone as follow

geometry
{
rotor
    {
        type            searchableCylinder;
        point1          (0 0 0); //start of zone center
        point2          (0 0 1); //height of zone 
        radius          3.00; //radius of zone
    }
}

//modify this to setup your zone 
castellatedMeshControls
{
    refinementSurfaces
    {
        rotor
        {
            level           (7 8);
            faceType        internal;
            cellZone        rotor;
            faceZone        rotor;
            cellZoneInside  inside;
        }
   }
}

cheers,
yewi

[aeronerd]

Doesn't the use of snappyHexMeshDict imply that this cellzone will only be created if the geometry is meshed with snappy hex mesh? I too would like to import a mesh from Salome and define the MRF cellzone for purposes of spinning a propeller.

Or does this leave the mesh untouched, but use snappyHexMesh somehow to only define a cellzone?

[linnemann]

If you want to use Salome for multizone meshing you can follow this tutorial.


https://www.youtube.com/watch?v=NYEU6ALOtJk


Key is to have a compound of solids that create "Groups of Volumes".
ideasUnvToFoam will use those groups to create cellZones.