[saeed jamshidi]

Hello,

I have simulated turbulent flow around a cylinder, and I have come across strange figure of nut!!

here is the nut BC:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2112                                |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0";
    object      nut;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 2 -1 0 0 0 0];

internalField   uniform 0; 

boundaryField
{

    inlet
    {
        type            calculated;
        value           uniform 0;
    }

    outlet
    {
        type            calculated;
        value           uniform 0;
    }

    Bottom
    {
        type            calculated;
        value           uniform 0;
    }

    top
    {
        type            calculated;
        value           uniform 0;
    }

	cylinder
    {
        type fixedValue;
		value uniform 0;
    }
	
    front
    {   
        type            calculated;
        value           uniform 0;
    }
	
	Back
    {   
        type            calculated;
        value           uniform 0;
    }
    
}

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

would you tell me why nut has undergone these steep changes? at the inlet and locations with mesh refinement.

Besides, z component of the velocity does not make sence!!
By the way, I am using k omega SST.

thank you in advance.