[thegauravonline]

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

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

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]

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]

using single mesh.

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

How to use mergeMesh?