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-   -   FORCES don't run! (http://www.cfd-online.com/Forums/openfoam/92328-forces-dont-run.html)

C12Carbon September 10, 2011 07:34

FORCES don't run!
 
Hi CFD online people! I have some problems with lib "forces" that it doesn't want start! Well, I'm using OpenFoam 1.73 and the last version 2.01 and I have to simulate a boat keel with simpleFoam solutor, using for both version motorbike's setup. I want to calculate forces on the keel patches, particolary viscous forces in the boundary layer; I DON'T WANT FORCECOEFFS!
OPENFOAM 1.73
Well, In the controlDict, at the page bottom, I add the following script:
" forces
{
type forces;
functionObjectLibs ("libforces.so"); //Lib to load
outputControl timeStep;
outputInterval 1;
patches ("keel.*"); // change to your patch name
rhoInf 1000; //Reference density for fluid
nuInf 1e-6; //Reference kinetic viscosity for fluid
CofR (0.191822 0 -0.418322); //Origin for moment calculations
}
forceCoeffs
{
type forceCoeffs;
functionObjectLibs ("libforces.so");
outputControl timeStep;
outputInterval 1;
patches ("keel.*"); //change to your patch name
rhoInf 1000;
nuInf 1e-6;
CofR (0.191822 0 -0.418322); //
liftDir (0 0 1);
dragDir (-1 0 0);
pitchAxis (0 1 0);
magUInf 2.37; //Edo:v_boat
lRef 0.43;
Aref 0.73;
}
"
I have just tried this method in other working simulation, however this time, when I start simulation, It says:
"--> FOAM Warning :
From function void forces::read(const dictionary& dict)
in file forces/forces.C at line 277
Could not find U, p or rho in database.
De-activating forces.
--> FOAM Warning :
From function void forces::read(const dictionary& dict)
in file forces/forces.C at line 277
Could not find U, p or rho in database.
De-activating forces
."
Why? What are the problems?

OPENFOAM 2.01
In this version I have created a file forces (containing the same script that I post at the top) in the system folder in place of forceCoeffs file (already existing in motorbike's tutorial) and I add at the bottom of contrlDict: "
#include "readFields"
#include "streamLines"

#include "forces""
When the simulation starts in the terminal apper same errors with the OpenFoam 1.73's simulation!
Anyone could help me please?
Thank you for answer and attention
Best regards



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