[ANSYS Meshing] Sweep Method and Inflation

AS_Aero · July 25, 2018, 10:31

Hi
I am trying to generate a mesh for a Rotor Turbine with 20 blades and i am using Sweep method (Hexa mesh)

And I am encountering few problems

1. I am trying to generate some inflation layers and sweep method is not allowing me to generate inflation layer around the Blade walls. I used by named selection.

2. I am using now the Curvature option in advanced size function, and it atleast generates some mesh. But when I use proximity or curvature and proximity, its not working, its taking too much time and crashing due to insufficient memory.
3. When I use simply use the sweep mesh, my blade tip has only one cell, (which is 2mm) and I use edge sizing for the blade tips and divide the edge into 4 divisions and then I get 4 cells along the blade tip. But the mesh around it is crappy by doing so, Is there any way to get rid of this or is it ok to keep it like that ?

Can someone tell me what could be the reason for all these ?

RedoFromStart · July 25, 2018, 20:51

As far as I know, sweep mesh method is for geometries like pipes, with fairly constant cross section, and turbine is not such case.

You could try MultiZone or cutting the geometry and applying sweep method to duct and different method to the rotor.

AS_Aero · July 26, 2018, 04:59

As per Ansys Support Multizone and Sweep is almost similar and they suggested me to try with Sweep

RedoFromStart · July 26, 2018, 07:34

If you have support available then go with their advices.
From your description and my experience, I still think that sweep is not a way to go.

Christophe · July 26, 2018, 13:35

You generally need a meshing program specific to turbomachinery to make a hex mesh on turbomachinery geometry. TurboGrid from ANSYS is one. or Numeca has some really good tools too.

Just go tet mesh and the inflation should be much easier to achieve if you are just using ANSYS meshing.

satyamshk2 · June 30, 2022, 13:23

The Sweep method is perfect for Rotor as far as you apply inflation on the faces not the body. You can apply inflation around blades on the source face and select edges of the blade as the boundaries. This way you can get inflation around the blades.

July 25, 2018, 10:31	Sweep Method and Inflation	#1
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	Hi I am trying to generate a mesh for a Rotor Turbine with 20 blades and i am using Sweep method (Hexa mesh) And I am encountering few problems 1. I am trying to generate some inflation layers and sweep method is not allowing me to generate inflation layer around the Blade walls. I used by named selection. 2. I am using now the Curvature option in advanced size function, and it atleast generates some mesh. But when I use proximity or curvature and proximity, its not working, its taking too much time and crashing due to insufficient memory. 3. When I use simply use the sweep mesh, my blade tip has only one cell, (which is 2mm) and I use edge sizing for the blade tips and divide the edge into 4 divisions and then I get 4 cells along the blade tip. But the mesh around it is crappy by doing so, Is there any way to get rid of this or is it ok to keep it like that ? Can someone tell me what could be the reason for all these ?

July 26, 2018, 13:35		#5
Christophe Member Join Date: Jan 2015 Posts: 62 Rep Power: 11	You generally need a meshing program specific to turbomachinery to make a hex mesh on turbomachinery geometry. TurboGrid from ANSYS is one. or Numeca has some really good tools too. Just go tet mesh and the inflation should be much easier to achieve if you are just using ANSYS meshing. RedoFromStart likes this.

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July 25, 2018, 20:51		#2
RedoFromStart New Member Join Date: Dec 2017 Posts: 10 Rep Power: 8	As far as I know, sweep mesh method is for geometries like pipes, with fairly constant cross section, and turbine is not such case. You could try MultiZone or cutting the geometry and applying sweep method to duct and different method to the rotor.

July 26, 2018, 04:59		#3
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 14	As per Ansys Support Multizone and Sweep is almost similar and they suggested me to try with Sweep

July 26, 2018, 07:34		#4
RedoFromStart New Member Join Date: Dec 2017 Posts: 10 Rep Power: 8	If you have support available then go with their advices. From your description and my experience, I still think that sweep is not a way to go.

June 30, 2022, 13:23		#6
satyamshk2 New Member CFD Join Date: May 2022 Posts: 15 Rep Power: 4	The Sweep method is perfect for Rotor as far as you apply inflation on the faces not the body. You can apply inflation around blades on the source face and select edges of the blade as the boundaries. This way you can get inflation around the blades.