Cp is increasing with increase in TSR and never decrease in 2D Unsteady analysis
 

Dear friends,
I am trying to simulate 3 bladed H-Darrieus VAWT rotor considering 2D unsteady analysis using fluent. Rotor details are in below:
airfoil chord length=5 cm
rotor diameter=50cm
rotor height=50 cm
wind speed=6.0 m/s
when i was calculating Cp from Cm values for each angular velocity, i found that Cp was increasing with increase in TSR and never decrease after the pick value of Cp. which was not the actual trend of Cp vs TSR graph for VAWT rotor. Can anyone detect where i am doing wrong. Please give necessary information and help me to solve the issue.

Thanks.

Same Problem
 

Hi.... I am getting the same problem.. In my case i am using a 3D unsteady using CFX. My Cp value is increasing with respect to TSR but never gets down even till 4TSR.

Same question
 

Hello,
Did you solve the problem?

When I tried upto 5 TSR . The Cp started decreasing . But in my case it needs to get down before 3 TSR