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June 10, 2012, 14:46
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Join Date: Oct 2011
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Hello CFD community,
i am a bit clueless with my wind turbine simulation which i have to do for a universityproject... After reading a lot in the Ansys documentation and on the internet (and this forum in particularly) i created a simlation as follows (see also first picture):
- 2 domains, one stationary and one rotational
- the blade is cut out of the inner domain and the generated faces are defined as wall
- inner domain is rotating to get a realistic airvelocity at the rotating blade (increasing to the tip)
- domains are connected with a frozen rotor interface
- the rotational periodicity is generated as a rotational periodicity interface

The results i get are a bit confusing and i guess that i made a general designmistake. If you look at the results (picture 2 and 3) you can notice a very abrupt change of the velocity between the two domains. I would have expected a steady distribution in the whole designspace.
Can you give me an advice how i have to change the flow analysis to get a realistic solution?

My first guess is that i made a mistake in geometry. My blade is also rotating, because it is a part of the inner domain. Actually i wanted to create a stationary blade and a rotating domain round this airfoil to get the velocitydistribution. Should i use 2 domains and a rigid body (blade) which overlaps the inner domain??! I tried this approach, but i couldn't create a mesh with a prism layer because of the overlap of the domain and blade...

Your help is apprecited a lot!
Attached Images
 Bild 002.jpg (49.9 KB, 45 views) Bild 004.jpg (41.1 KB, 37 views) Bild 005.jpg (48.3 KB, 31 views)

 June 10, 2012, 18:53 #2 New Member   Kyriakos Vafiadis Join Date: Feb 2011 Location: Kozani, Greece Posts: 29 Rep Power: 7 Try to plot the velocity in stn frame. This variable (velocity) is the relative velocity caused by the rotation of the rotating domain relative to a stationary observer. __________________ -- Kyriakos Vafiadis Mechanical Engineer, PhD candidate

 June 11, 2012, 04:31 #3 New Member   Join Date: Oct 2011 Posts: 7 Rep Power: 7 Ahh! Thanks, that explains a lot!

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