# Problem with the 2D rotating blade-CFX-12.1

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 September 3, 2011, 05:54 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 2D simulations can be either tranlational or rotational. In your case it sounds like a rotational one might be more suitable. Have you done the axial rotor/stator example which comes with CFX? That will show you the basics of how to set this up. And read the best practises guide while you are at it. If you want more specific help please post an image of your geometry.

September 3, 2011, 06:10
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Araz
Join Date: Feb 2011
Posts: 32
Rep Power: 7
Dear Glenn,

Thanks for your reply, I have done that tutorial before and gone through the best practices guide. After doing all these I posted my question.

Here is my blade from a front view.

Thanks again
Attached Images
 rotortranslated.jpg (56.6 KB, 53 views)

 September 3, 2011, 06:23 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 Have a look at the geometry modelled in the tutorial again. Hopefully you can see the difference between it and what you have modelled. You have modelled a very strange rotating machine. I think you will find you cannot model this 2D, but need to model a single blade passage in 3D.

 September 3, 2011, 06:50 #5 Member   Araz Join Date: Feb 2011 Location: Canada Posts: 32 Rep Power: 7 Thanks a lot Glenn, As I said, it is a thin slice of the blade in the mid-span. It is working properly in Fluent, So I hope I can find a way to do so in CFX. what I don't understand is that, using the velocity triangles, I calculated all the relative flow variables, so by using them as the boundary conditions, we can set the blade and the domain as Stationary and the setup would be exactly like a Stator. I have no problem with stator but I don't know why this is not working properly. Anyway, Thanks a lot for your time and help

 September 3, 2011, 07:54 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,832 Rep Power: 100 I see, OK then the 2D approach makes sense, providing rotation effects (coriolis, centripetal) are not significant. Then there should be no need for rotating frames of reference at all. Just get the AOA right and it should all work from there. Do not use turbo mode to set this up as it is a simple stationary model.

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