CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   forces using OpenFOAM-1.6-ext (http://www.cfd-online.com/Forums/openfoam-solving/103219-forces-using-openfoam-1-6-ext.html)

ebah6 June 13, 2012 21:16

forces using OpenFOAM-1.6-ext
 
Dear all,

I wonder whether there is adjustments in using forces type in the controlDict file from OpenFOAM-2.1x to OpenFOAM-1.6-ext.

The controlDict file looks like this:

functions
(
forces
{
type forces;
functionObjectLibs ("libforces.so");
outputControl timeStep;
outputInterval 1;
patches (innerBlades);
rhoName rhoInf;
log true;
rhoInf 1.225;
CofR (0 0 0.05);
}
);

the viscous forces and moments looks fine but the pressure ones not so.
For example, if I set the initial internal pressure field in 0/p at 0, the pressure forces come out zero:
forces output:
forces(pressure, viscous)((0 0 0) (0.00361717 0.00349609 -2.61363e-05))
moment(pressure, viscous)((0 0 0) (1.73933e-06 -4.97862e-06 -0.00040247))
and if I set this internal pressure field at atmospheric value 1.01325e+5, the results come out non zero but nearly zero:
forces(pressure, viscous)((-7.61613e-15 -1.22402e-14 3.08017e-18) (0.00341451 0.00334337 -1.47808e-05))
moment(pressure, viscous)((-8.05998e-17 -4.94104e-16 -4.76008e-16) (4.06332e-08 -2.98494e-06 -0.00063185))

Can anyone help with this issue.

Note: I was using as until pimpleDyMFaom from OF-2.1.x but because of repeated crashes, I am trying out icoDyMFoam from OF-1.6-ext.

Thank you for your help.


All times are GMT -4. The time now is 03:22.