# torque coefficient

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 October 31, 2008, 06:30 torque coefficient #1 mokemex Guest   Posts: n/a 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

 October 31, 2008, 07:49 Re: torque coefficient #2 mAx Guest   Posts: n/a Coef = Torque / (0.5*A*rho*U^2)

 October 31, 2008, 10:53 Re: torque coefficient #3 Friend Guest   Posts: n/a Dear Max, the coefficient provided is not dimensionless but it does have a unit of m (meter). Any explanation?

 November 3, 2008, 01:42 Re: torque coefficient #4 mAx Guest   Posts: n/a Coefficients are dimensionless. I forgot the length... Coeff= Torque/(0.5*rho*A*L*U^2)

 November 3, 2008, 01:51 Re: torque coefficient #5 mAx Guest   Posts: n/a Sorry (Thanks Friend for your units-check) Coef = Torque / (0.5*A*rho*L*U^2)

 November 3, 2008, 15:41 Re: torque coefficient #6 Friend Guest   Posts: n/a Happy to see your reply, hand shake

 March 10, 2010, 10:53 #7 New Member   Dennis Chen Join Date: Mar 2010 Posts: 6 Rep Power: 7 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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