CFD Online Discussion Forums - [Other] Moving a flap inside a mesh

Dear Foamers,
Currently I am stuck with dynamic mesh. I need to do a simulation, which involves a metal solid flap in a water tank, rotating a certain angle to generate a vortex pair on the bottom wall.
Firstly I think of solidBodyMotion with tabulated6DoFMotion to prescribe the motion of the flap. However, after the first simulation I found out that the neighbouring mesh points stand still at their position, resulting in a poor mesh quality. I know that dynamicMotionSolverFvMesh enables mesh morphing but it does not have a parameter or a BC for inputting motion profile.
So far I am able to “move the flap” by defining the motion in 0/pointDisplacement file, using angularOscillatingDisplacement BC. However I want the flap to move accordingly to my prescribed, tabulated motion profile. Is there a way to achieve this?

Code 1. The dynamicMeshDict

Code:

FoamFile

{

    version     2.0;

    format      ascii;

    class       dictionary;

    location    "system";

    object      dynamicMeshDict;

}

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



dynamicFvMesh dynamicMotionSolverFvMesh;



motionSolverLibs ("libfvMotionSolvers.so");



solver displacementLaplacian;



displacementLaplacianCoeffs

{

    diffusivity  inverseDistance 5.0 (flapPatch);



    report            on;

    reportToFile      on;

}

Code 2. 0/pointDisplacement

Code:

FoamFile

{

    version     2.0;

    format      ascii;

    class       pointVectorField;

    location    "0";

    object      pointMotionU;

}

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



dimensions      [0 1 0 0 0 0 0];



internalField   uniform (0 0 0);



boundaryField

{

    front

    {

        type            empty;

    }



    back

    {

        type            empty;

    }



    top

    {

        type            uniformFixedValue;

        uniformValue    (0 0 0);

    }



    zeroGrad

    {

        type            uniformFixedValue;

        uniformValue    (0 0 0);

    }



    ground

    {

        type            uniformFixedValue;

        uniformValue    (0 0 0);

    }



    flapPatch

    {

        type            angularOscillatingDisplacement;

        axis            (1 0 0);

        angle0          0.0;

        amplitude       0.11407;

        omega           0.18021;

        origin          (0.0 19.4 22.3);



        value           uniform (0 0 0);

    }



    symmetry_Y

    {

        type            uniformFixedValue;

        uniformValue    (0 0 0);

    }



    defaultFaces

    {

        type            uniformFixedValue;

        uniformValue    (0 0 0);

    }

}

Fig. 1 The overall mesh
Attachment 59043

Fig. 2 The flap that I wish to move
Attachment 59044

Fig.3 The required motion profile. The flap is initially tilted to certain angle from the vertical plane.
Attachment 59045