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getting results in cfd post

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Old   July 8, 2022, 10:33
Default getting results in cfd post
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sasha
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Hi everybody!
I simulated an airborne wind turbine(consisting of rotor and stator) in Ansys and solved it by cfx, now I want to evaluate the result but don't know how to get a pressure coefficient plot like the paper's result(I attached the results of the paper). I tried writing this expression in cfd post according to the formula in the reference paper but it was not correct!(attached the formula)


(cp = (Pressure-Reference Pressure )/(0.5*areaAve(density)@(the plane that I want to see the contur on)*((Velocity-blade velocity)^2+ (Radius * abs(omega) / 1 [rad])^2)) )

also, I tried to change it but nothing worked and sometimes I got this error: there is no data in cp! also I don't know which function and location suite for my goal I read cfd post tutorial and found nothing!

this is my first project in Ansys! It would be great if you could help me or send me a relevant context to learn about the topic!
Attached Images
File Type: png (810).png (7.1 KB, 11 views)
File Type: png (814).png (42.1 KB, 12 views)
File Type: jpg (816).jpg (50.9 KB, 11 views)

Last edited by sasha-; July 9, 2022 at 06:01.
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Old   July 8, 2022, 19:20
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Glenn Horrocks
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The images are not attached. This FAQ might be helpful: https://www.cfd-online.com/Wiki/Ansy...n_the_forum.3F
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Old   July 9, 2022, 06:03
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thank you, I edited the post!
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Old   July 9, 2022, 07:56
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The CFX reference pressure is not (well, at least it should not be) p_inf. I presume p_inf in your equation is the far field pressure. Assuming you have the far field set to zero pressure then p_inf should be zero.

The second part of your question seems to say that you cannot generate this variable anyway. In CFD-Post you will need to define it as a new variable (I think that is the third tab), and when correctly defined it will become a variable available like velocity and pressure and all the others.
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Old   July 14, 2022, 14:29
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hi, thanks for your reply! do you know how can I generate the variable to get a plot like "fig 10" which I uploaded before? to be clear, I don't know how to write the proper expression! I searched and found out people use functions like "areaAve,..." it doesn't seems rational to me as I need to get the result along a line from inlet to outlet and areaAve seems to estimate parameters on a plane! I'm a little bit confused, can you help me?
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Old   July 17, 2022, 22:57
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I would not recommend using CFD-Post to draw graphs like that. I would export the data to python, matlab or whatever you like and do it there.
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