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how can caclulate forceCoeffs of force.dat file after finishing analysis

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Old   May 14, 2013, 05:49
Default how can caclulate forceCoeffs of force.dat file after finishing analysis
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s.m
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saeideh mohamadi
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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.
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Old   May 26, 2013, 03:08
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Tarak
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Check the forceCoeffs directory
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Old   May 26, 2013, 09:20
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s.m
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saeideh mohamadi
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Quote:
Originally Posted by Tarak View Post
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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