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thegauravonline January 14, 2017 05:14

FSI motion error
 
1 Attachment(s)
Grids of my 3D geometry are leaving some gap at interface between solid and fluid.[see- attachment]
What could be the reasons for it?

solver- icoFSIElasticNonLinULSolidFoam

motion U
Code:

FoamFile
{
    version    2.0;
    format      ascii;
    class      tetPointVectorField;
    object      motionU;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField  uniform (0 0 0);

boundaryField
{

      plate
      {
                  type fixedValue;
                    value uniform (0 0 0);
      }

      topWall
      {
                  type slip;
                value          uniform (0 0 0);
        }

        bottomWall
        {
                  type fixedValue;
                    value uniform (0 0 0);
        }

        outlet
        {
                  type fixedValue;
                    value uniform (0 0 0);
        }

       
        frontAndBackPlanes
        {
                  type slip;
                value          uniform (0 0 0);
        }


        inlet
        {
                    type fixedValue;
                    value uniform (0 0 0);
        }
}


U
Code:

FoamFile
{
    version    2.0;
    format      ascii;
    class      volVectorField;
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField  uniform (0 0 0);

boundaryField
{
    plate
    {
        type            movingWallVelocity;
        value          uniform (0 0 0);
    }
    topWall
    {
        type            fixedValue;
        value          uniform (0 0 0);
    }
    bottomWall
    {
        type            fixedValue;
        value          uniform (0 0 0);
    }
    outlet
    {
        type            zeroGradient;
    }
    inlet
    {
        type            transitionalParabolicVelocity;
        maxValue        0.056;
        n              ( 1 0 0 );
        y              ( 0 1 0 );
        transitionPeriod 1.17;
        boundBoxMin    ( 0 0 -0.024 );
        boundBoxMax    ( 0 0.0275 0.024 );
        value          uniform (0 0 0);
    }
    frontAndBackPlanes
    {
        type            fixedValue;
        value          uniform (0 0 0);
    }
}

Please help
Thanks

khedar January 22, 2017 11:51

Is your mesh a single mesh or you are using mergeMesh to merge two meshes.

I have had similar problem in OF2.3.1 which i solved by shifting to OF4.x.

thegauravonline January 23, 2017 02:46

using single mesh.

I am running foam extend 3.2. Other versions dont have this solver

How to use mergeMesh?


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