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Old   October 31, 2008, 06:30
Default torque coefficient
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mokemex
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Dear all,

Does any body know What the relation that fluent uses to compute the (torque)moment coefficient? I couldn't find something about it in the fluent documentation.

thank you in advance for any help

mokemex
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Old   October 31, 2008, 07:49
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mAx
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Coef = Torque / (0.5*A*rho*U^2)
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Old   October 31, 2008, 10:53
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Dear Max, the coefficient provided is not dimensionless but it does have a unit of m (meter). Any explanation?
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Old   November 3, 2008, 01:42
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mAx
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Coefficients are dimensionless. I forgot the length...

Coeff= Torque/(0.5*rho*A*L*U^2)

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Old   November 3, 2008, 01:51
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mAx
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Sorry (Thanks Friend for your units-check)

Coef = Torque / (0.5*A*rho*L*U^2)

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Old   November 3, 2008, 15:41
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Happy to see your reply, hand shake
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Old   March 10, 2010, 10:53
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Dennis Chen
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Guys, I'm trying to calculate Cm but having difficult on finding moment. I use SC/Tetra and set 0.25c is the point I want to get moment value from. Shouldn't torque on a airfoil be the moment on z-axis? The values of Cm in experiment are all negative. I've tried different ways to calculate but only positive value I could get.
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