# Difficulty in calculating angular velocity of Savonius turbine simulation

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 May 17, 2012, 06:10 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,803 Rep Power: 85 It is likely the device is accelerating and will take a while to reach equilibrium. Rather than using the rigid body solver I recommend you do a series of steady state (well, frozen rotor actually) simulations at different rotation speeds. A series of frozen rotor simulations are far easier to do than a single rigid body model. This gives you a map of torque produced against rotational speed. At the point the torque equals the load (ie zero net torque) that is the steady state operating point of the device.

 May 17, 2012, 21:48 #3 New Member   Abdullah Al Faruk Join Date: Apr 2012 Posts: 5 Rep Power: 5 Thank you very much Glenn.

 May 2, 2013, 17:39 #4 New Member   asmita Join Date: Apr 2013 Posts: 12 Rep Power: 4 Hello I want to find out the angular velocity and torque of a turbine in Fluent-Ansys. Is it possible to find out ? My turbine rotates in one direction and its enclosed in a rectangle . THe geometry in drawn using Gambit software

 May 2, 2013, 18:40 #5 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,803 Rep Power: 85 Try the fluent forum. khaled ali likes this.

May 28, 2013, 08:01
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 Originally Posted by ghorrocks It is likely the device is accelerating and will take a while to reach equilibrium. Rather than using the rigid body solver I recommend you do a series of steady state (well, frozen rotor actually) simulations at different rotation speeds. A series of frozen rotor simulations are far easier to do than a single rigid body model. This gives you a map of torque produced against rotational speed. At the point the torque equals the load (ie zero net torque) that is the steady state operating point of the device.
hi ghorrock
i had simulated a wind turbine using fluent and now i want to calculate the output power using torque.(report-moment)
but all the amounts which i had calculated using this method is 10 times bigger than real amounts
i don't now what to do.
would you plz help me???

 May 28, 2013, 21:36 #7 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,803 Rep Power: 85 FAQ: http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F And you will get more specific help on Fluent on the Fluent forum.

 December 3, 2013, 17:31 help me #8 New Member   khaled Join Date: Sep 2013 Posts: 5 Rep Power: 3 I want how to make to simulate Savonius wind turbine using the rigid body solver of ANSYS CFD v12.1 with sliding mesh of subdomain. How can I calculate angular velocity of rotor and torque on rotor in CFD or CFX-post? and how to calcute drag coefficient and lift coefficient

 December 3, 2013, 17:51 #9 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,803 Rep Power: 85 Using the rigid body solver for this is not recommended. I explain why in post #2. Use a series of frozen rotor simulations at various speeds instead.

 Tags cfx 13, wind turbines

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