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How to model a VAWT Wind Turbine?

Question asked by 1-S6KAZM on Jul 7, 2010

I am trying to modelate a Savonius VAWT with Flowsimulation. I am looking for the idle speed of the rotor so I am calculating the Torque given by different rotational speeds and with this I calculate the Power (P=angularvelocity x Torque) The problem is that I get unexpected oscilations in the results that it makes it totally unlogical. If somebody has an idea I would be really greatful.

 


The initial conditions are the following:

 


Inlet velocity in the wind channel : 7,5 m/s

 

Outlet of the wind channel: environmental pressure

 

Rotational speed: 0 - 100-200-300......1000 rpm

 

Local mesh: Level 8 near the turbine

 

Initial mesh: Level 4

 

Convergence criterion: Torque 5e-3

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