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Stage interface doesn't work as intend?

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Old   July 4, 2018, 06:40
Default Stage interface doesn't work as intend?
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Dear CFX Users,
I'm using CFX 16 and I'm facing strange behavior of stage interface in CFX Turbomachinery simulation of Axial Turbine. I believe it could be cause by mesh or bad settings. Please, see the attachments.
velocity1.png and mesh1.png shows velocity and mesh on the stator side of interface.
velocity2.png and mesh2.png shows circumferential averaged velocity and mesh on the rotor side of interface.

I do not really understand why there is such a large region with close-to-zero velocity on the rotor side.


I will appreciate any suggestions,
Oskar
Attached Images
File Type: png velocity1.png (189.2 KB, 37 views)
File Type: png mesh1.png (82.4 KB, 35 views)
File Type: png velocity2.png (140.7 KB, 36 views)
File Type: png mesh2.png (99.3 KB, 25 views)
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Old   July 9, 2018, 05:25
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Increase number of circumferential bands.

EXPERT PARAMETERS:
force intersection = t
ggi stage groups max = 250
END
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Old   July 9, 2018, 11:59
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Dear Mister Ludvik.
I haven't tried it yet but I think You are right. I'm going to try it as fast as possible to ensure Your solution is right.
Thank Your very much.
Sheaker
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Old   December 17, 2018, 14:05
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Dear Ludvik,
after many attempts I still don't now where to set "ggi stage groups max = 250".


Could You possibly point me where to set it?


Best regards,
Oskar
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Old   December 17, 2018, 16:50
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It is an expert parameter. Not all expert parameters are on the CFX-Pre GUI, many are CCL only. If you use Ludvik's CCL in your CCL it should work.
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Old   December 17, 2018, 17:20
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Quote:
Originally Posted by ghorrocks View Post
It is an expert parameter. Not all expert parameters are on the CFX-Pre GUI, many are CCL only. If you use Ludvik's CCL in your CCL it should work.

Thank You for Your answer, horrocks. I'm going to set it in CCL. (I don't know how to do it yet but I think I can figure it out by myself.)


Regards,
Oskar


I think it does not resolve my problem. I have created CCL file:
Code:
FLOW: Flow Analysis 1
  EXPERT PARAMETERS:
    force intersection = t
    ggi stage groups max = 250
  END
END
COMMAND FILE:
  Version = 16.0
END
and load it to CFX but results are exactly the same.

Last edited by sheaker; December 18, 2018 at 01:33.
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