Force on a patch
I need to calculate the force caused by the flow on a patch.
In the first picture you can see the result of the simpleFoam solver. In the second there's the patch I want to calculate Fx on.
I tried in Parafoam to integrate pressure on the surface but maybe I miss something (BTW, is there a tutorial regarding this managements ?)
Another simple question: p for incompressible solver is actually divided by density.
That means that the real pressure at the end has to be multiplied by density, right ?
Probably I should have posted this under the parafoam forum. Is there any way to move it by me ?
Anyway, I tried the following in Parafoam:
1. Select the above patch.
2. Generate surface normals.
3. Use calculator to define a new var called Px defined as
p*N_x*1000. (where 1000 is density of water).
4. Integrate Px on the surface.
Is it correct ? The obtained value is in Newton, right ?
Another way, more flexible is to use the libforces library as follow:
Just a confirmation: is it right ?
Yes it is. Just modify the CoR (center of reference) if you want the values of Mx My and Mz.
There is also a "forceCoeffs" function for Cx Cy and Cz calculations.
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