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-   -   how can caclulate forceCoeffs of force.dat file after finishing analysis (http://www.cfd-online.com/Forums/openfoam-post-processing/117719-how-can-caclulate-forcecoeffs-force-dat-file-after-finishing-analysis.html)

s.m May 14, 2013 05:49

how can caclulate forceCoeffs of force.dat file after finishing analysis
 
Hi dear Foamers,

i am analyzing the incompressible flow over a Naca 4412 airfoil, my analysis has been converged at 534th step.now i have a folder that the results for forces are in it,

the last line of "force.dat" file is :

"""# Time forces(pressure, viscous) moment(pressure, viscous)
534 (((1.49508 -6.67508e-18 101.445) (1.17413 2.86026e-21 -0.0507981)) ((-20.2891 1.94745 0.299016) (0.0101596 -0.0244948 0.234827)))"""

my Question is that how could i use the number of "forces(pressure, viscous)" to calculate the "cd and cl" or "moment(pressure, viscous)" to compute "cm" ??

please help me understand the issue, thank you very much:)
Regards.

Tarak May 26, 2013 03:08

Check the forceCoeffs directory

s.m May 26, 2013 09:20

Quote:

Originally Posted by Tarak (Post 430059)
Check the forceCoeffs directory

Hi Tarak;
i know that we have forceCoeffs function that also is written in controlDict, that give us, CD, and CL
but now i wana know with this forces how could we calculate "CD and CL and CM"
would you please give me more explenation,
thank you very much :)


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