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-   -   Problem in forceCoeffs file (http://www.cfd-online.com/Forums/openfoam/108315-problem-forcecoeffs-file.html)

srini_esi October 19, 2012 06:34

Problem in forceCoeffs file
 
Dear All,

This is Srini.

I have setup an external_aero case for simpleFoam solver by refering motorbike tutorial.

While solution progresses, Cd, Cl must be written to forceCoeffs file in \forces\0\forceCoeffs.dat file.

I feel there is problem in entering patches in forceCoeffs file in system folder.

I have entered like this :-

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

patches ( car_TOP );
pName p;
UName U;
rhoName rhoInf; // Indicates incompressible
log true;
rhoInf 1; // Redundant for incompressible
liftDir (0 0 1);
dragDir (1 0 0);
CofR (0.72 0 0); // Axle midpoint on ground
pitchAxis (0 1 0);
magUInf 20;
lRef 1.44; // Wheelbase length
Aref 0.9; // Estimated
}
Error message is displayed like this

Calculating potential flow
--> FOAM Warning :
From function polyBoundaryMesh::patchSet(const wordReList&, const bool) cons
t
in file meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C at line 573
Cannot find any patch names matching car_TOP

output in console is like this:-

forceCoeffs output:
Cd = 0
Cl = 0
Cm = 0
Cl(f) = 0
Cl(r) = 0

I have defined boundary layers for some patches in stl file like this:-
layers
{
minZ
{
nSurfaceLayers 1;
}
car_TOP
{
nSurfaceLayers 5;
}
car_TRUNK
{
nSurfaceLayers 5;
}
car_HOOD
{
nSurfaceLayers 5;
}
car_CABIN_2
{
nSurfaceLayers 5;
}
car_SIDE_GLASS
{
nSurfaceLayers 5;
}
car_CABIN_1
{
nSurfaceLayers 5;
}

Kindly help me in resolving this problem.

Best Regards,
Srini


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