Ducted wind turbine (BC for the shroud)

Pepita · March 8, 2011, 23:37

Dear all,

I'm working on modelling wind turbines with CFX. I've already got satisfactory results on a bare wind turbine (validated with experimental data). However, I can not get good results for the ducted wind turbine. I used MFR for the unducted turbine, so I did for the ducted wind turbine. But I'm not sure if this will be the right settings for the shrouded WT)...I used exactly the same BC exept for the duct (before it was not there) so I gave couter wall velocity to the duct (the blade sees it rotating to the opposite direction of omega.) It's a steady state simulation, the residuals are set to 10^-5 and #iteration to 1000, the convergence is obtained in some of the TSR (i run different simulations with different omega) but not in all. But the results for ducted wind turbine are terrible!!!

Any help is much appreciated and many thanks for taking the time to read the post.

Cheers,

pepi

ghorrocks · March 9, 2011, 19:47

Have you done all the normal checks - sensitivity analysis of mesh size, convergence, timestep size (if transient), bonudary proximity and any other physical models?

Pepita · March 14, 2011, 22:20

Thanks a lot ghorrocks!I've tried your suggestions and it turns out I didn't realize my mesh was not as good as I expected.....Sorry and thanks for taking the time to reply!

cheers

syedrizvi · June 29, 2013, 08:05

Is any body know the physics drying for wind shear for installation 200w Shroud wind turbine on roof top.

ghorrocks · June 29, 2013, 08:09

Please start a new thread rather than hijacking an old thread. And when you do this please make your question clearer so I do not understand what you said.

March 8, 2011, 23:37	Ducted wind turbine (BC for the shroud)	#1
Pepita New Member Join Date: Mar 2011 Posts: 2 Rep Power: 0	Dear all, I'm working on modelling wind turbines with CFX. I've already got satisfactory results on a bare wind turbine (validated with experimental data). However, I can not get good results for the ducted wind turbine. I used MFR for the unducted turbine, so I did for the ducted wind turbine. But I'm not sure if this will be the right settings for the shrouded WT)...I used exactly the same BC exept for the duct (before it was not there) so I gave couter wall velocity to the duct (the blade sees it rotating to the opposite direction of omega.) It's a steady state simulation, the residuals are set to 10^-5 and #iteration to 1000, the convergence is obtained in some of the TSR (i run different simulations with different omega) but not in all. But the results for ducted wind turbine are terrible!!! Any help is much appreciated and many thanks for taking the time to read the post. Cheers, pepi

March 14, 2011, 22:20	thank u	#3
Pepita New Member Join Date: Mar 2011 Posts: 2 Rep Power: 0	Thanks a lot ghorrocks!I've tried your suggestions and it turns out I didn't realize my mesh was not as good as I expected.....Sorry and thanks for taking the time to reply! cheers

June 29, 2013, 08:05	Shroud Wind Power	#4
syedrizvi New Member Syed Mumtaz Hasan Rizvi Join Date: Jun 2013 Posts: 2 Rep Power: 0	Is any body know the physics drying for wind shear for installation 200w Shroud wind turbine on roof top. Aye Mya Moh likes this.

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March 9, 2011, 19:47		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Have you done all the normal checks - sensitivity analysis of mesh size, convergence, timestep size (if transient), bonudary proximity and any other physical models?

June 29, 2013, 08:09		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Please start a new thread rather than hijacking an old thread. And when you do this please make your question clearer so I do not understand what you said.