# Calculating Performance Coefficient (Cp) in Fluent

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 July 29, 2015, 16:02 Calculating Power Coefficient (Cp) in Fluent #1 New Member   Aidan Join Date: Jun 2015 Posts: 16 Rep Power: 2 Hi everyone, I just want to verify if I am doing something correctly here and I'm not way off in my understanding..... To work out the Power Coefficient (Cp) of a VAWT in Fluent: I have worked out the time taken for each degree of rotation, so I will set my time step equal to the time taken for 1 revolution, and 360 iterations per time step. I then use the Monitors section of Fluent to show the Moment for each degree. After obtaining 360 values, I copy and paste the data into excel and to calculate the performance coefficient, I use the formula Cp=lambda * C_T where lambda is the tip-speed ratio. (I got this formula from this paper: http://www.technicaljournalsonline.c...ticle%2022.pdf) And then I work out the Cp value for each of the 360 value and then get the overall average to get my final Cp figure. Am I correct in my understanding that "Moment" in Fluent is actually C_T in the above formula? And am I correct in my understanding of how to calculate Cp. Thanks for your assistance. djawad likes this. Last edited by aptahaney; August 1, 2015 at 09:00. Reason: typo.

 September 5, 2015, 19:22 #2 New Member   abuabdellah Join Date: Jan 2012 Posts: 21 Rep Power: 5 are you there buddy?

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