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How to use sixDoFRigidBodyMotion to provide mesh rotation withouth deforming the mesh

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Old   February 6, 2023, 12:10
Question How to use sixDoFRigidBodyMotion to provide mesh rotation withouth deforming the mesh
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Eduardo Firvida
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Hi, I'm using sixDoFRigidBodyMotion to compute the rotation of NREL Phase IV wind generator rotor (~5m diameter). After waiting for some time the simulation started to explode. And I found that the mesh start to be deformed, (see the pictures). My case is basically the propeller example with the rotor geometry and changing the dynamicMeshDict to:

Code:
 
/*--------------------------------*- 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      dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
report          yes;
reportToFile    yes;
dynamicFvMesh   dynamicMotionSolverFvMesh;

motionSolverLibs (libMySixDoFRigidBodyMotion);

motionSolver    sixDoFRigidBodyMotion;

patches         (rotor);
innerDistance   0;
outerDistance   6;

orientation
(
    1 0 0
    0 1 0
    0 0 1
);

mass            577.3;
centreOfMass    (-1.850E-07 -0.009 2.911E-08);
momentOfInertia (3416.204 3420.038 13.145);
angularMomentum (0 0 0);
g               (-9.81 0 0);

rho             rhoInf;
rhoInf          1;
report          on;

solver
{
    type symplectic;
}

constraints
{
    oCenter
    {
      sixDoFRigidBodyMotionConstraint   point;
      centreOfRotation                  $centreOfMass;
    }

    yAxis
    {
        sixDoFRigidBodyMotionConstraint axis;
        axis                           (0 1 0);
    }
}

restraints
{
   
}

// ************************************************************************* //
But what I spect as in the propeller tutorial is that the mesh region rotates, and not the rotor inside its mesh regions and deforming it.
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File Type: jpg Screenshot from 2023-02-06 13-56-51.jpg (200.8 KB, 22 views)
File Type: jpg Screenshot from 2023-02-06 13-56-21.jpg (197.3 KB, 18 views)
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Old   November 14, 2023, 05:36
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  #2
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Manuel Fermin Fonseca
Join Date: Nov 2014
Location: Valencia, Venezuela
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Hello, could you solve, it has happened like me, change your inner diameter to a rotor the AMI diameter.
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ami, motion dynamicmesh, sixdofmotionsolver

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