[gmpatzer]

Hi, I converted a STL sphere into the Openfoam format using this guide (http://sourceflux.de/blog/preparing-geometry/).

I am using the simpleFoam solver and I'm trying to print out the coefficients of drag and lift. However, they are all returning 0. Here is my controlDict file:

functions
{
  #includeFunc streamlines
  forcesCoeffs
  {
    type forceCoeffs;
    functionObjectLibs ( "libforces.so" ); // lib to load
    writeControl timeStep;
    writeInterval 50;
    rho rhoInf;
    patches
    (
    body // change to your patch name
    );
    rhoInf 1000;
    log true; // dump to file
    CofR ( 0 0 0 );
    liftDir ( 0 1 0 );
    dragDir ( 1 0 0 );
    pitchAxis ( 0 0 0 );
    magUInf 9;
    lRef 1;
    Aref 0.1;
  }
}

(I got the code from this forum post: lift and drag coefficient) I modified that forum post a couple of times (e.g by removing pName and UName) to no avail.

This is the code in my fvSolution

solvers
{
    p
    {
        solver          GAMG;
        tolerance       1e-06;
        relTol          0.1;
        smoother        GaussSeidel;
    }

    "(U|k|epsilon|omega|f|v2)"
    {
        solver          smoothSolver;
        smoother        symGaussSeidel;
        tolerance       1e-05;
        relTol          0.1;
    }
}

SIMPLE
{
    nNonOrthogonalCorrectors 0;
    consistent      yes;
    pRefCell  0;
    pRefPoint 0;
    pRefValue 0;

    residualControl
    {
        p               1e-2;
        U               1e-3;
        "(k|epsilon|omega|f|v2)" 1e-3;
    }
}

relaxationFactors
{
    equations
    {
        U               0.9; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.9; // 0.9 is more stable but 0.95 more convergent
    }
}

I am fairly new to this software. Does anyone have any recommendations for what I can do? Thanks!

[mzzmrt]

as you see in controlDict;


"patches (body); ..."


you have to use the defined wall(s) name(s) here instead of "body"