[SUBHANKAR]

Hi everyone,
I have started using openFoam since last two months.
I am studying flow past a cylinder kept between two infinitely large plates. Reynolds no. is 500 and strouhal no. is 0.18.I want to get the co-efficient of drag and lift. How can i get the values?Also can you suggest appropriate boundary conditions.

Thanks in advance.

regards
Subhankar

[T.D.]

Hi,

You can get them by forces functions to place inside system/controDict.
For example, if you look to /tutorials/compressible/sonicFoam/ras/nacaAirfoil/system/controlDict
you will fine the following:

functions
{
    forces
    {
        type            forceCoeffs;
        libs ( "libforces.so" );
        writeControl   timeStep;
        writeInterval  1;

        patches
        (
            WALL10
        );

        log         true;
        rhoInf      1;
        CofR        (0 0 0);
        liftDir     (-0.239733 0.970839 0);
        dragDir     (0.970839 0.239733 0);
        pitchAxis   (0 0 1);
        magUInf     618.022;
        lRef        1;
        Aref        1;
    }
}

Good Luck !

Regards,
T.D.