[RAJU REDDY]

Hello guys,
I am running the 2D simulation for VAWT with 3 blades using fluent.
moment center is at (0 0 0) and moment axis is (0 0 1)
Inputs given as :
Turbine RPM:572.9
Time step size :1.052*10^-4
number of time steps for one complete revolution:995
When i report the moments it gives me the moments at at each step.Please let me know how to calculate Cp from those results?

[fluid23]

your in-plane moment is your torque. torque x angular velocity is power (extracted). cp is the ratio of power extracted to power available. you will have to average the results for at least one full revolution, preferably a few, to get the cp value you are after.

[swordofangel]

HEY I sm pursuing the same thing! can you tell how you created mesh for the moving mesh interface ! ?

[RAJU REDDY]

Originally Posted by MBdonCFD

your in-plane moment is your torque. torque x angular velocity is power (extracted). cp is the ratio of power extracted to power available. you will have to average the results for at least one full revolution, preferably a few, to get the cp value you are after.

Thank you for your response,
I did same thing. I just averaged the coefficient of moments which i got from the simulation and claculated torque by using the formula given below
T=1/2*Cmaverage*rho*A*V^2*L
And Cp= T*Angular velocity/(1/2*rho*A*V^3).
But the value is found to be very high and it is not even close to the limit.Please help me.Thank you