[sjsivabharathy]

Hello everyone. I am trying to oscillate airfoil using mesh morphing scheme in openFOAM. The problem is that the airfoil undergoes continuous pitching motion about a fixed point (leading edge) and not exhibit angular oscillation.


My pointDisplacement file


/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 6
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
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
{
outlet
{
type fixedValue;
value uniform (0 0 0);
}
inlet
{
type fixedValue;
value uniform (0 0 0);
}
top
{
type fixedValue;
value uniform (0 0 0);
}
bottom
{
type fixedValue;
value uniform (0 0 0);
}
left
{
type empty;
}
right
{
type empty;
}
airfoil
{
type angularOscillatingDisplacement;
origin (0 0 0);
amplitude 1;
omega 0.0349042; //units of rad/s
axis (0 0 1);
angle0 0;
value uniform (0 0 0);
}
}
// ************************************************** *********************** //


My dynamicMeshDict file



/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 6
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object dynamicMeshDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
dynamicFvMesh dynamicMotionSolverFvMesh;
motionSolverLibs ("libfvMotionSolvers.so");
motionSolver displacementLaplacian;
displacementLaplacianCoeffs
{
diffusivity inverseDistance 1(airfoil);
}
************************************************** *********************** //


I also tried a case for oscillation displacement along y-direction. Again, the airfoil continuously traverse down and not up-down-up motion.