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[TGrid] Topology-error

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Old   November 25, 2015, 09:36
Default Topology-error
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Konstantin Zitrus
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Hello,

I am trying to mesh the fluid volume of a radial compressor with turbogrid. After preparing the hub, the shroud and the blade geometry of main-blade and splitt-blade with the Ansys Design Modeler, I wanted to mesh the volume in turbogrid. The geometry seems to be loaded correctly, but the topology fails with the following Error:


ERROR
An error was thrown while generating the span geometry for Topology.
This probably means the selected topology is not appropriate. Details are given below:
U value outside ot its bounds. Value =-0.243

How can I solve this problem?

Thank you for your answers.
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Old   November 27, 2015, 05:44
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Maxim
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I think I had a similar error before. In my case, part of my blade was cutting through in the inlet/outlet interface of the TurboGrid.
So I would suggest you double-check the geometry (location of inlet/outlet/hub/shroud) - maybe give the TG mesh some more space around the blade.

It would maybe also help to post a screenshot of your geometry in Ansys Design modeler
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Old   May 29, 2016, 18:26
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Hossein
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Hello,
I'm trying to mesh a radial turbine (with splitters) Using TurboGrid, I have exported the geometry of blades and splitters using Design Modeler via two separate ExportPoints features for blades and splitters.
Here is where I'm stuck:
1. When I try to mesh the turbine with both blades and splitters, I get the same topology error which is discussed in this topic.
2. I can mesh a turbine with just blades, or just splitters which seems to mean that the curves don't have any problems and topology constraints is the cause of error.
3. I changed the the place of leading edge and trailing edge and meshed the geometry as a centrifugal compressor, this resulted to a nice mesh without even a warning!

Is it possible that I use the compressor mesh and correct it by boundary conditions in the next step?
Would this effect the validity of results?
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Old   March 4, 2020, 09:59
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Brett
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Hey all,

Any resolution to this?

Im trying to add a second splitter to a compressor model and that seems to be triggering the error the first poster described/.
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Old   September 22, 2020, 00:51
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Andreas Sun
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try change the rotation direction, it works on my cases sometimes.
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Old   July 25, 2023, 16:51
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Weiqiang Zhao
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Quote:
Originally Posted by causuya View Post
try change the rotation direction, it works on my cases sometimes.
This is correct. It works for me!
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