Search found 11 matches

by Kisorthman.Vimalakanthan
Wed May 04, 2016 6:34 am
Forum: Computer-Aided Engineering Software Tools
Topic: WT_Perf being removed from distribution
Replies: 3
Views: 11287

Re: WT_Perf being removed from distribution

I'm truly saddened to hear about WT_Perf, It was also my favourite BEM code :cry: Despite the bugs, It was an essential tool for my research and it helped me to learn everything I now know about fundamental aerodynamics of HAWT. It will be truly missed.
by Kisorthman.Vimalakanthan
Mon Apr 01, 2013 3:59 pm
Forum: Rotor Aerodynamics
Topic: Constant wind profile for WT_Perf
Replies: 2
Views: 6857

Re: Constant wind profile for WT_Perf

Dear Marshal, Once again, I'm glad to say that you have successfully fixed my problem :) I wanted the turbines with different hub heights to be sampling their own part of the same wind profile such that a smaller one will have a lower hub-height wind speed than a taller one will see, and your method...
by Kisorthman.Vimalakanthan
Fri Mar 22, 2013 1:24 pm
Forum: Rotor Aerodynamics
Topic: Constant wind profile for WT_Perf
Replies: 2
Views: 6857

Constant wind profile for WT_Perf

Dear all, I'm currently evaluating the performance of different sized rotors under one sheared wind. The hub height of these rotors vary a lot, and wanted to asses them under one wind profile. I suspect when I set the wind shear exponent in the WT_Perf input file, the hub height is used as the refer...
by Kisorthman.Vimalakanthan
Tue Jan 17, 2012 12:46 pm
Forum: Rotor Aerodynamics
Topic: Induced velocities due to blade deflection
Replies: 5
Views: 7871

Re: Induced velocities due to blade deflection

Dear Marshal, Thank you very much for your resent response, it was very helpful. After some WT_Perf runs, I think I have found the cause of the problem. I have been using the WT Perf version 3.04.00c-mlb, where I think the reported Airflow angles are for zero tangential induction factor because the ...
by Kisorthman.Vimalakanthan
Wed Jan 11, 2012 3:17 pm
Forum: Rotor Aerodynamics
Topic: Induced velocities due to blade deflection
Replies: 5
Views: 7871

Re: Induced velocities due to blade deflection

Many thanks for your response Marshall. This did occur to be as I have not input any structural properties of the turbine, and from my understanding WT_Perf is a pure BEM method that does not account for the aeroelastic behaviour of the turbine. Hence could you please suggest a reason why there is a...
by Kisorthman.Vimalakanthan
Tue Jan 10, 2012 3:19 pm
Forum: Rotor Aerodynamics
Topic: Induced velocities due to blade deflection
Replies: 5
Views: 7871

Induced velocities due to blade deflection

Dear all, From comparing my hand calculations using the inductions factors computed by WT_Perf, I was not able to get a consistent Airflow angles reported by the WT_Perf. My calculation as follows: a =0 a' = 0.209 r = 2.8667 m U = 9m/s, Omega = 10.296 rpm Precone and shaft tilt: 0deg I'm currently u...
by Kisorthman.Vimalakanthan
Mon May 16, 2011 1:43 pm
Forum: Airfoils
Topic: Airfoilprep Lift Spikes
Replies: 6
Views: 11326

Re: Airfoilprep Lift Spikes

Dear Jason, This is exactly what I was looking for, thank you very much. From what I can gather is that for a best suited data, it is only necessary to apply 3D stall and drag (Viterna) correction within the positive 0-90 deg alpha(angle of incidence) range. This also suggests that stall or drag cor...
by Kisorthman.Vimalakanthan
Sat May 14, 2011 10:39 am
Forum: Airfoils
Topic: Airfoilprep Lift Spikes
Replies: 6
Views: 11326

Airfoilprep Lift Spikes

Hi guys, I'm having some issue generating smooth lift curves that you guys have managed for the Delft airfoil (DU40_17) profile used in the NREL 5MW analysis. I have tried to replicate the process but failing to obtain such smooth variation of lift for high angle of attack. I have managed to get the...
by Kisorthman.Vimalakanthan
Mon Jan 31, 2011 2:42 pm
Forum: Rotor Aerodynamics
Topic: NREL 5MW Rotor Geometry
Replies: 15
Views: 38996

Re: NREL 5MW Rotor Geometry

Thanks Jason for your swift responce. The pitch axis information was the main priority, im really glad that you have solved that for me. I have tried contacting the guys at DOWEC but once agin no responce from them, maybe I will contact them again.

Kind Regards,
Kishore
by Kisorthman.Vimalakanthan
Sun Jan 30, 2011 11:35 am
Forum: Rotor Aerodynamics
Topic: NREL 5MW Rotor Geometry
Replies: 15
Views: 38996

Re: NREL 5MW Rotor Geometry

Thanks a lot for these information guys. Jason I am aware of the analysis on NREL 5MW rotor by the combined effort of the University of California and the University of rise*. I have tried to contact them regarding the stacking and airfoil information, unfortunately no response from them. But I was ...
by Kisorthman.Vimalakanthan
Fri Jan 28, 2011 12:28 pm
Forum: Rotor Aerodynamics
Topic: NREL 5MW Rotor Geometry
Replies: 15
Views: 38996

NREL 5MW Rotor Geometry

Hi Guys, Firstly I would like to say I'm privileged to have access to the forum. I'm a PhD student. My research is focused on aerodynamics of wind turbine, At the moment I'm trying to build CAD model of the NREL 5MW baseline rotor so I can make a GRID and undertake a CFD analysis, but having some di...

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