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How to calculate lift and drag coefficient in OpenFOAM

To be able to output lift and  drag coefficients on a patches or boundaries , once much have  to modify controlDict file within system directory

functions

{    forces

    {

        type        forceCoeffs;

        functionObjectLibs ( "libforces.so" );

        outputControl timeStep;

        outputInterval 1;

        patches

        (

            WALL10

        );

        pName       p;

        UName       U;

        log         true;

        rhoInf      1;

        CofR        ( 0 0 0 );

        liftDir     ( -0. 0.9 0 );

        dragDir     ( 0.9 0. 0 );

        pitchAxis   ( 0 0 1 );

        magUInf     61.0;

         lRef        1;

         Aref        1;

    }

}

Boundaries where you would like to monitor the forces, drag or lift are written within the patches.

Some additional parameters  which are important for cd and cl calculation should also be specified  

·         OutputInterval : internal at which output will be reported

·         rhoInf :  is the free stream density.

·         MagUinf :   is the magnitude of the free stream velocity.

·         Aref  : referece area

·         liftDSir and dragDir : Lift and Drag direction vectors are specified

·         The forceCoeffs functionObject prints out the lift and drag coefficients.

·         See the sonicFoam/ras tutorial: system/controlDict