[DesignModeler] Adding a hub fillet in Design Modeler/Turbogrid

rafr894 · April 17, 2023, 06:46

Hi, I was wondering if there is a simple way to add a fillet at the impeller hub in Design modeler and/or Turbogrid. The standalone impeller blade and the flow path is generated in Design Modeler (the blade profile is imported as points, and connected using the 3D curve option), and imported into Turbogrid for meshing.

Thanks.

zacko · April 18, 2023, 23:41

As far as I know you can only use the fillet tool in Spaceclaim, for example (called Pull). It would be new to me if TG supports any fillet function. Therefore, you would need to use Ansys Meshing for your blade.

As an idea, idk if this would work. If you extract multiple curves of the impeller at the fillet as well and then import the blade data into TG, it maybe will build the blade with a fillet.
If you have any progress, please, share it here

rafr894 · April 19, 2023, 02:48

Thanks for your reply. Unfortunately, trying to round the hub edges using Pull (in SpaceClaim) or Blend in Design modeler does not help since there is no hub surface that the blade rests on. The flowpath is created in BladeEditor with the blade hub as the hub reference directly. Therefore, the above commands "eat into" the edge, so as to speak, i.e., the fillet is inverted, which is not what I wanted.

I suppose extracting multiple surves is an option. I was looking for an easier workaround, I guess!

zacko · April 19, 2023, 03:35

Oh yes, that makes sense. Without a hub surface the fillet won't work.

zacko · April 19, 2023, 03:49

Another idea:
Is it possible to create a new hub surface which meets the hub curve?
Maybe, then the fillet feature will work and you can start generating the point curves at the fillet and extract them for TG. Maybe thats a possible workaround.

rafr894 · April 19, 2023, 08:39

Yes, more or less what I did. I went ahead with extruding a platform, and then making a fillet, and then adding multiple layers to extract points off of, as shown. The problem I have now is with the meshing, namely, the periodic surface from the extracted flow path is now ballooning out as shown in the mesh surface in yellow. This leads to an error in the mesh, which I can't quite seem to solve with my limited knowhow of this tool.

zacko · April 19, 2023, 09:52

It is possible to create additional mesh layers, maybe you can add a few more to stabilise this issue (I assume, that TG has already created more than usually due to the layers at the hub, to accurately represent the fillet) . Another option would be to check which connection between these layers is used: BSpline or linear. I imagine it won't help, but it is worth a shot

April 17, 2023, 06:46	Adding a hub fillet in Design Modeler/Turbogrid	#1
rafr894 New Member KristianRanta Join Date: Oct 2016 Location: Sundsvall Posts: 25 Rep Power: 9	Hi, I was wondering if there is a simple way to add a fillet at the impeller hub in Design modeler and/or Turbogrid. The standalone impeller blade and the flow path is generated in Design Modeler (the blade profile is imported as points, and connected using the 3D curve option), and imported into Turbogrid for meshing. Thanks. zacko likes this.

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April 18, 2023, 23:41		#2
zacko Senior Member Daniel Join Date: Feb 2017 Location: Germany Posts: 147 Rep Power: 9	As far as I know you can only use the fillet tool in Spaceclaim, for example (called Pull). It would be new to me if TG supports any fillet function. Therefore, you would need to use Ansys Meshing for your blade. As an idea, idk if this would work. If you extract multiple curves of the impeller at the fillet as well and then import the blade data into TG, it maybe will build the blade with a fillet. If you have any progress, please, share it here

April 19, 2023, 03:35		#4
zacko Senior Member Daniel Join Date: Feb 2017 Location: Germany Posts: 147 Rep Power: 9	Oh yes, that makes sense. Without a hub surface the fillet won't work.

April 19, 2023, 03:49		#5
zacko Senior Member Daniel Join Date: Feb 2017 Location: Germany Posts: 147 Rep Power: 9	Another idea: Is it possible to create a new hub surface which meets the hub curve? Maybe, then the fillet feature will work and you can start generating the point curves at the fillet and extract them for TG. Maybe thats a possible workaround.

April 19, 2023, 09:52		#7
zacko Senior Member Daniel Join Date: Feb 2017 Location: Germany Posts: 147 Rep Power: 9	It is possible to create additional mesh layers, maybe you can add a few more to stabilise this issue (I assume, that TG has already created more than usually due to the layers at the hub, to accurately represent the fillet) . Another option would be to check which connection between these layers is used: BSpline or linear. I imagine it won't help, but it is worth a shot