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How to split air blade in CFX Post without loosing accuracy

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Old   December 8, 2020, 05:32
Default How to split air blade in CFX Post without loosing accuracy
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Ivan Shvolko
Join Date: Dec 2020
Location: Minsk
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Hello everyone!
I'm working on vertical axis wind turbine modeling (VAWT) in Ansys CFX.
On my model turbine consists from 3 blades, everyone of them assigned as separate surface.
I need to get power/force/etc., both on the entire blade and on its sections.

For this I used the Iso Clip tool. Please see power by sections. (turbine located at 45 degree angle to the air flow)
Left and right blade sides divided to 8 sections, as a result, we have 16 sections on entire blade. Power data for each section is located above corresponding section on attached screenshot.
Total power from the left blade side: 111.0 [W]
Total power from the right blade side: -16.9 [W]
Total power: 94.1 [W]

Let's check calculations:
Iso clip entire blade (Blade length along Z axis from -2.37m to 2.37m)
So we get power on entire blade, calculated from Iso clip: ~94.1 [W]
If we use the same blade from mesh region.
We get power on entire blade, calculated from mesh region: ~-50.6 [W]

And what we have? If I use in my calculations geometry from Iso Clip tool, I have one result, if I use directly geometry from mesh region I have different result.

Please advice me.
Splitting blade by Iso Clip tool leads to loose accuracy?
What else (instead Iso Clip) I should use to get data from different blade sections? (without reconfiguring, splitting each blade to separate surfaces and then resolving model)

Thanks in advance.
Attached Images
File Type: jpg From mesh region_006.jpg (74.4 KB, 6 views)
File Type: jpg Iso clip power_002.jpg (86.8 KB, 16 views)
File Type: jpg iso clip_003.jpg (86.8 KB, 13 views)
File Type: jpg From Iso Clip_004.jpg (80.3 KB, 11 views)
File Type: jpg mesh regions_005.jpg (96.3 KB, 8 views)
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Tags
blade sections, iso-clip


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