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Resistant torque (friction) which depends on the rotational speed

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QuentinMercier
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Resistant torque (friction) which depends on the rotational speed

Hello everyone,

 

I'm Quentin Mercier, a mechanical engeneering student in France.

I work on a savonius type wind turbine. My first simulations go well but now I have to include a friction phenomenum which depends on the rotational speed. But the only option I have on the software in the motion menu are constant, table which depends on time (could have been the right choice) and torsion spring.

Here is the law I should include:

Capture d’écran 2013-05-27 à 14.28.17.png

 

Does anyone have an idea to include that type of friction in the CFD program?

 

 

 

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Quentin,

  For something like this we would typically use a Rotating Region versus Solid body motion.

 

You could try setting up the curve under Known Driving Torque (for a rotating region) and assign it as a negative value such that it would be acting opposite the rotational speed, assuming the air speed is high enough to overcome this it should get added in

 

Similar to my previous reply on the other post, you may want to try some of this in 2D if you can to get a feel for it and then step up to 3D once you have some of the specifics ironed out for your model.

 

Apolo

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