CFD Online Discussion Forums - how to set functions about Cd and Cl

Hello everyone
I am simulating flow past a square cylinder problem.I have attached the model here.The flow is along z axis.The square cylinder axis is parallel to the y-axis.The width and the height of the square cylinder is 0.1 and 0.3.
I have tried to set the file accorrding http://openfoamwiki.net/index.php/Be...coftac_ufr2-02but the result looks not good.

Code:

functions

{

    



    forces

    {

        type        forceCoeffs;

        functionObjectLibs ( "libforces.so" );

        outputControl timeStep;

        outputInterval 1;

        patches

        (

            INWALL

        );

                directForceDensity no;



        pName       p;

        UName       U;

        rhoName     rhoInf;

        //log         true;

        rhoInf      1;

        CofR        ( 0 0 0 );

        liftDir     ( 1 0 0 );    //x direction

        dragDir     ( 0 0 1 );    //z direction

        pitchAxis   ( 0 0 0 );

        magUInf     2;         //z direction

        lRef        0.1;

        Aref        0.03;    //

        Aref1        0.01;   //?

        rhoRef      1;

    }



   

}

I am not sure about the red lines.

Thank you very much!

regards

JM