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wallShearStress not calculated

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Old   November 20, 2013, 13:59
Default wallShearStress not calculated
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ArathoN
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I'm studying the Backward facing step with inclined step, and i decided to mesh the geometry in Gambit. Now i'm having a problem in using the utility wallShearStress, it gives only null values of the shear in the x,y,z directions? Why? what can i do? I specified correctly the boundaries from gambit and also from the bondaries file too.
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Old   November 20, 2013, 14:08
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ArathoN
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I must specify that the sampling of the wallshearstress can't be done, otherwise the variable is calculated.

Here my sample file:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.2                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      sampleDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


setFormat gnuplot;

surfaceFormat raw;

interpolationScheme cellPoint;
fields
(
    "wallShearStress"
);

sets
(
    
lineX1
    {
        type        face;
        axis        x;

        start       (0 -0.1 0);
        end         (2.5 -0.1 0);
        nPoints     400;
    }

);

surfaces
(
    
 walls_interpolated
    {
        type            patch;
        patches         ( "lowerWall" );
        interpolate     true;
    }

);
it gives me this error:
Code:
surfaces surfaces: Reading surface description:
    walls_interpolated

Time = 0


--> FOAM FATAL IO ERROR: 
size 30 is not equal to the given value of 40

file: /home/arathon/Tesi/Cases/K-E/BackwardFacingStep-15/0/wallShearStress.boundaryField.inlet from line 26 to line 27.

    From function Field<Type>::Field(const word& keyword, const dictionary&, const label)
    in file /home/opencfd/OpenFOAM/OpenFOAM-2.2.2/src/OpenFOAM/lnInclude/Field.C at line 236.

FOAM exiting
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