CFD Online Discussion Forums - Forces on two body-wing in compressible flow.

Hello!

i'm having some problems with my forces function in controlDict.
I need to calculate forces on two different patches, for a 2D compressible flow over an airfoil
is correct my add in controlDict?

Code:

functions

{

    forces

    {

        type                forces;

        functionObjectLibs  ( "libforces.so" );

        outputControl       timeStep;

        outputInterval      10;

        patches             (airfoil, spoiler);

        pName               p;

        UName               U;

        rhoName             rhoInf;

        log                 true;

        rhoInf              1;

        CofR                (0.4974612746 -0.01671895744 0.125);

    }

}

i'm worried for rhoName rhoInf. is it correct for compressible flow?
i'm using rhocentralfoam as solver.

my output is something like this:

Code:

1.000000e+00    ((5.429676e-03 -6.062612e-02 -1.929098e-21) (0.000000e+00 0.000000e+00 0.000000e+00) (0.000000e+00 0.000000e+00 0.000000e+00)) ((2.273480e-02 2.036128e-03 -2.466588e-02) (0.000000e+00 0.000000e+00 0.000000e+00) (0.000000e+00 0.000000e+00 0.000000e+00))

with two bodies, i was expecting 8 sets. (for each body: 1 set of pressure forces, 1 set of viscous forces,1 set of pressure moment, 1 set of viscous moment)
there are just 6 sets...why?