Drag coefficient on a 2-D cylinder
 

Hi guys

I'm using OpenFoam 2.2.0 to visualize vortex shedding around a 2-D cylinder. I want to calculate the drag coefficient as well, to find the frequency of vortexes. I've added the following commands to controlDict:

functions
{
forces
{
type forceCoeffs;
functionObjectLibs ( "libforces.so" );
outputControl timeStep;
outputInterval 1;

patches
(
cylinder
);

pName p;
UName U;
log true;
rhoInf 1;
CofR ( 0 0 0 );
liftDir ( 0 1 0 );
dragDir ( 1 0 0 );
pitchAxis ( 0 0 1 );
magUInf 1;
lRef 1;
Aref 1;

binData
{
nBin 20; // output data into 20 bins
direction (1 0 0); // bin direction
format gnuplot;
cumulative yes;
}
}
}
}

but, there is no output of the drag coefficient or, if there is, I am not able to see such an output file.

could somebody please help me to be able to take the Drag Coefficient?