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deforming mesh with AMI

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Old   February 27, 2024, 09:51
Default deforming mesh with AMI
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Rithwik Kandukuri
Join Date: Mar 2023
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Hi. im using OFv2306. trying to simulate a VAWT with a heaving motion superimposed. Due to problem geometry constraints, my airfoil wall is extremely close to my AMI interface. Due to this constraint, I think the cells near the AMI interface get heavily skewed a few time steps in. I'm working on refining the mesh right now. Other pointers to fix this issue, or alternative methods to acheive this would be great ( tried overset meshes, not been very succesful with it, case is very transient and pressure oscillations are too uncontrollable ) . I'm attaching my pointDisp and dynamicMeshDictFiles

dynamicMeshDict
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dynamicFvMesh dynamicMultiMotionSolverFvMesh;   //dynamicMotionSolverFvMesh;

// Specification of rotation around centre

dynamicMultiMotionSolverFvMeshCoeffs
{    
    dualWing1
    {
        cellZone innerVar-cells;

        
        solver solidBodyDisplacementLaplacian;


        solidBodyDisplacementLaplacianCoeffs
        {
            solidBodyMotionFunction  multiMotion;
            multiMotionCoeffs
            {
                
                rotation_2
                {
                    // Apply counter rotation to keep dualWing aligned
                    solidBodyMotionFunction rotatingMotion;
                   rotatingMotionCoeffs
                   {
                       origin      (0 2.527 0);;
                       axis            ( 0 0 1);
                       omega            1.7453;    //5.52 rad/s
                   }
                                                            
                }
            }
            diffusivity quadratic inverseDistance ("var_foil1");
        }
    }
}
pointDispacement
Code:
```
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 0 0 0 0 0];

internalField   uniform (0 0 0);
boundaryField
{
    back
    {
        type empty;
    }
    bottom
    {
     type symmetryPlane; 
    }
    front
    {
        type   empty;
    }
    inlet
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    outerSliderBase
    {
        type            cyclicAMI;
    type            fixedValue;
        value           $internalField;
    }
    outerSliderVar
    {
         patchType       cyclicAMI;
        type            fixedValue;
        value           $internalField;
    }
    outlet
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    top
    {
         type           symmetryPlane;
    }
    innerSliderVar
    {
         patchType       cyclicAMI;
        type            fixedValue;
        value           $internalField;
    }
    base_foil1
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    var_foil2
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    var_foil1
    {
        type            solidBodyMotionDisplacement;
        solidBodyMotionFunction oscillatingRotatingMotion;
        oscillatingRotatingMotionCoeffs
        {
            origin          ( 0 2.527 0 );
            axis            ( 0 0 1 );
            omega           3;
            amplitude       ( 0 0 5 );
        }
    }
    base_foil2
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    innerSliderBase
    {
        type            cyclicAMI;
    type            fixedValue;
        value           $internalField;
    }
}


// ************************************************************************* //
```
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ami, mesh deformation, openfoam, skewed cells, v2306

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