CFX - Yawed Turbine - Wake Deflection

mspranavmn · May 28, 2019, 16:17

Hello Everyone,

I simulated a turbine with a yawed flow to understand the wake deflection and propagation. The wake generated is deflecting in the direction opposite to what everyone else is reporting. I am not able to figure out what the problem might be. Did anyone face a similar issue anytime? Can someone help me with it.

I checked for blade rotation, mesh quality (y+<5), boundary condition (inlet is uniform velocity and outlet is 0Pa static pressure).

Thank you.

ghorrocks · May 28, 2019, 22:04

Please post an image of what you are getting and what you expect. Also your output file.

By the way - y+ is not a measure of mesh quality. That is a measure of near wall mesh resolution. Quality is things like aspect ratio, orthogonality, expansion ratio and factors like that.

mspranavmn · May 30, 2019, 11:35

Quote:

Originally Posted by ghorrocks

Please post an image of what you are getting and what you expect. Also your output file.

By the way - y+ is not a measure of mesh quality. That is a measure of near wall mesh resolution. Quality is things like aspect ratio, orthogonality, expansion ratio and factors like that.

I have attached the image of the expected and the image of what I am getting. I have changed the extension of the output file to .txt as it was not allowing me to upload the .out file. Thank you.

ghorrocks · May 30, 2019, 19:56

Please have a think about what you are posting. Your image is a mystery. I have no idea what that shows, how you set it up and what it means. You are going to have to explain what is happening.

Gert-Jan · May 31, 2019, 05:09

The pictures look like the upper part of a thigh bone . So, for me it could be a stress calculation as well.

May 28, 2019, 16:17	CFX - Yawed Turbine - Wake Deflection	#1
mspranavmn New Member Join Date: Jun 2015 Posts: 8 Rep Power: 11	Hello Everyone, I simulated a turbine with a yawed flow to understand the wake deflection and propagation. The wake generated is deflecting in the direction opposite to what everyone else is reporting. I am not able to figure out what the problem might be. Did anyone face a similar issue anytime? Can someone help me with it. I checked for blade rotation, mesh quality (y+<5), boundary condition (inlet is uniform velocity and outlet is 0Pa static pressure). Thank you.

May 28, 2019, 22:04		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Please post an image of what you are getting and what you expect. Also your output file. By the way - y+ is not a measure of mesh quality. That is a measure of near wall mesh resolution. Quality is things like aspect ratio, orthogonality, expansion ratio and factors like that. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

May 30, 2019, 19:56		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Please have a think about what you are posting. Your image is a mystery. I have no idea what that shows, how you set it up and what it means. You are going to have to explain what is happening. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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May 31, 2019, 05:09		#5
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	The pictures look like the upper part of a thigh bone . So, for me it could be a stress calculation as well.