Forces calculation
 

Hello OpenFOAM users&fans,

I am new to OpenFOAM and I am simulating a 2D flow over a cylinder with pisoFoam.

When I am trying to find the forces, the forces.dat file only shows brackets full of zeros. The forces code seen below creates a forces/0 folder where forces.dat is located. I am referring to the right patch in the code. Do you have some suggestions or ideas of what could be wrong?

This is my forces code in my controlDict.h

functions
(
forces
{
type forces;
functionObjectLibs ( "libforces.so" ); outputControl timeStep;
outputInterval 1;
patches (wall);
pName p;
UName U;
log true;
rhoName rhoInf;
rhoInf 1025;
CofR ( 0 0 0 );
}
);

Hi

Is your cylinder named wall? If not change the

patches (wall);

line in forces{... } to

patches (whatever you've called it);

Hope that helps

Nick

If the patch name is correct, try also to remove the lines beginning with pName and Uname: judging by other treads in the forum, these lines can give some troubles in the 1.7.x versions of OpenFOAM.

Regards

V.

Any one knows if there are problems with force function in 3D multifaces patch?

Thankyou.

It was just a stupid mistake, for some reason I had changed my patch name to something else than "wall". It is fixed now, thank you.