# Wind turbine simulation help

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April 15, 2009, 15:44
Wind turbine simulation help
#1
New Member

kirit
Join Date: Apr 2009
Posts: 4
Rep Power: 8
Hi,
I am trying to simulate 2D savonius rotor wind turbine. but i have done every thing good so far expect the post processing one.

I am trying to calculate the Drag coefficient and Lift coefficient of my work. The way which i am using right now. Report > Forces> then i am going to x and y direction forces. Then converting the the forces in to tangential force and normal force using those two Equation :

Fn= Fx*SinA+Fy*CosA
Ft=-(Fx*CosA-Fy*SinA)

Here is A is 0 for balde1, 120 for blade2, 240 for blade 3 .

After that i am using the formula
Cd=Fd/(1/2*p*U*U*A)
Cl=Fl/(1/2*p*U*U*A)
to calculate drag and lift.

But i am not getting the value which i am suppose to get for this work. Am i going to the right way ??

I have attached jou file i am not sure you will be able to see that please let me know. i cant upload the cas file as the size is more than 97 kB.

Kirit
Attached Files
 0Axis.zip (1.2 KB, 41 views)

 April 16, 2009, 10:53 #2 New Member   kirit Join Date: Apr 2009 Posts: 4 Rep Power: 8 please see the cas file at http://rcpt.yousendit.com/676477626/...9dd604c4aeb713 with thanks.

 May 18, 2009, 11:10 #3 New Member   Thanh Nha Nguyen Join Date: May 2009 Posts: 3 Rep Power: 8 Hi kirit! I doing the same problem to u. But i don't know how to Apply the inlet and outlet. How can we apply the angular velocity of rotor what the unknown of turbine problem?

 June 23, 2009, 06:49 wind turbine rotor #4 Member   sivaramakrishnaiah Join Date: Mar 2009 Location: india,pondicherry Posts: 75 Rep Power: 8 hi all, i am also doing same problam please send me your case file and gambit file,i will check it, __________________ sivaramakrihnaiah

 June 23, 2009, 10:09 #5 New Member   kirit Join Date: Apr 2009 Posts: 4 Rep Power: 8 I cant upload file coz its big than they permit. if you give me your mail address i can send it to you thanks Kirit

 June 24, 2009, 06:47 windturbine simulation help #6 Member   sivaramakrishnaiah Join Date: Mar 2009 Location: india,pondicherry Posts: 75 Rep Power: 8 Hi,how are you, Thankyou very much, My mail ID:siva@green-line.com,malayathisiva@gmail.com, sivaramakrishnaiah@live.com __________________ sivaramakrihnaiah

April 22, 2010, 22:45
wind turbine
#7
New Member

yashwant
Join Date: Apr 2010
Posts: 20
Rep Power: 7
Quote:
 Originally Posted by sivarama1 hi all, i am also doing same problam please send me your case file and gambit file,i will check it,
sir i am student of M.tech at NIT surat. i am doing numerical simulation of wind turbine by fluent. so i am facing some problems with defining the boundary conditions. so wl u please help me regarding boundary conditions.sir i have modeled wind turbine in gambit and meshed it with two domain interior domain with .5d same as wind radius. and another one is off bigger domain of 4d in diameter. and 3d in front and 5d in back. i have defined the interface in between the surfaces of interior and outer domain. by giving the condition of rotor stationary and the near by domain air is rotating i am getting the axial velocity at the rotor plane more than inlet velocity. is this correct or not. and please help me out how to calculate the power output and coefficient of power.
thanks
--

April 22, 2010, 22:48
#8
New Member

yashwant
Join Date: Apr 2010
Posts: 20
Rep Power: 7
Quote:
 Originally Posted by sivarama1 Hi,how are you, Thankyou very much, My mail ID:siva@green-line.com,malayathisiva@gmail.com, sivaramakrishnaiah@live.com
sir i am student of M.tech at NIT surat. i am doing numerical simulation of wind turbine by fluent. so i am facing some problems with defining the boundary conditions. so wl u please help me regarding boundary conditions.sir i have modeled wind turbine in gambit and meshed it with two domain interior domain with .5d same as wind radius. and another one is off bigger domain of 4d in diameter. and 3d in front and 5d in back. i have defined the interface in between the surfaces of interior and outer domain. by giving the condition of rotor stationary and the near by domain air is rotating i am getting the axial velocity at the rotor plane more than inlet velocity. is this correct or not. and please help me out how to calculate the power output and coefficient of power.
thanks
--

 April 23, 2010, 00:15 wind turbine design #9 Member   sivaramakrishnaiah Join Date: Mar 2009 Location: india,pondicherry Posts: 75 Rep Power: 8 Hi This is my DESIGN Calculations,but i was done in CFX,i know in little bit in fluent and gambit http://www.4shared.com/document/Vnjp...dturbine3.html http://www.4shared.com/document/KaBz..._TURBINE1.html __________________ sivaramakrihnaiah

 April 23, 2010, 00:25 #10 New Member   yashwant Join Date: Apr 2010 Posts: 20 Rep Power: 7 sir i hav calculated all this by developing the code for BEMT meathod. but i require the guidence regarding CFD analysis either in fluent or cfx. how to calculate all thins with these softwares

 April 23, 2010, 04:24 wind turbine #11 Member   sivaramakrishnaiah Join Date: Mar 2009 Location: india,pondicherry Posts: 75 Rep Power: 8 Hi ok, very long back i was done simulation in CFX-11 Boundary conditions: Inlet:Stagination Temperature and Velocity(sunsonic) Outlet: static pressure(subsonic) K&e model,boundary layer 2mm __________________ sivaramakrihnaiah

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