[ErenC]

Hello!

I have a case where I have to oscillate a wall in an enclosure(square cavity). Without oscillating wall everything is fine! When I use "reaaaally" low amplitude, it also works. But I also need relatively large amplitudes. Whatever I try (I tried multiple dynamicMesh options, displacementLaplacian for example) I can't get physical results. I get really low and high temperatures near oscillating wall that are lower and higher than boundary conditions, which is impossible!

Here are my files, and help would be great!

Thank you in advance,
Eren.


p boundary conditions are all zeroGradients.



U

boundaryField
{
    BAWall
    {
        type            noSlip;
    }
    BHWall
    {
        type            noSlip;
    }
    LWall
    {
        type            movingWallVelocity;
        value           uniform (0 0 0);
    }
    RWall
    {
        type            noSlip;
    }
    TWall
    {
        type            noSlip;
    }
    frontAndBack
    {
        type            empty;
    }
}

pointMotionUx

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  5                                     |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       pointScalarField;
    object      pointMotionU;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    TWall
    {
        type            uniformFixedValue;
        uniformValue    constant 0;
    }
    LWall
    {
       type            uniformFixedValue;
       uniformValue    sine;
       frequency 10;
       amplitude 0.0001;
       scale     1;
       level     0;
    }
    BHWall
    {
        type            uniformFixedValue;
        uniformValue    constant 0;
    }
    BAWall
    {
        type            uniformFixedValue;
        uniformValue    constant 0;
    }
    RWall
    {
        type            uniformFixedValue;
        uniformValue    constant 0;
    }
    cylinder
    {
        type            uniformFixedValue;
        uniformValue    constant 0;
    }
    backandBack
    {
        type            empty;
    }
    
}

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

dynamicMeshDict

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  5                                     |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dynamicFvMesh   dynamicMotionSolverFvMesh;

motionSolverLibs ("libfvMotionSolvers.so");

motionSolver    velocityComponentLaplacian;

component       x;

diffusivity     directional (0 0 0);


// I ALSO TRIED DIFFERENT DIFFUSIVITIES BUT DIDNT WORK!

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