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-   -   [ANSYS Meshing] How to mesh an airfoil? (http://www.cfd-online.com/Forums/ansys-meshing/105705-how-mesh-airfoil.html)

Julian121 August 7, 2012 05:30

How to mesh an airfoil?
 
4 Attachment(s)
I am trying to mesh a 3D airfoil using edge sizing and inflation functions in ANSYS.

I have used quad mesh instead of triangular to mesh the airfoil.

I am not sure if the mesh is 100% correct.

Could you please tell me if there is any problem?

Please look at the screenshots.

Thank you in advance!

flotus1 August 7, 2012 06:15

the volume jump between the last cell of the prism layers and the first cell of the regular mesh is far too high.

Why wouldn't you use a block-strucutred hexahedral mesh for this purpose?

Julian121 August 7, 2012 07:40

1 Attachment(s)
Quote:

Originally Posted by flotus1 (Post 375759)
the volume jump between the last cell of the prism layers and the first cell of the regular mesh is far too high.

Why wouldn't you use a block-strucutred hexahedral mesh for this purpose?

I have never used hexahedral mesh before. I don't know how to do it.

I have changed the mesh and used triangular mesh. How is that now? Is it acceptable?

flotus1 August 7, 2012 08:00

Looks better, but still the transition between the cell volumes looks too fast.
Don't forget to include the prism layers.
I don't think that you need such a high mesh density at the leading and trailing edge of the airfoil.
Personally, I would avoid tet meshes and use hexahedrons whenever possible.
I think there are some tutorials in this forum about this topic, some of them especially dealing with airfoils

Touré August 7, 2012 08:59

It' better to have prism on the boundary layer (airfoil). You can keep the triangles at the same time.
Check at http://www.cfd-online.com/Forums/ans...nt-places.html

Julian121 August 7, 2012 09:15

Quote:

Originally Posted by Touré (Post 375823)
It' better to have prism on the boundary layer (airfoil). You can keep the triangles at the same time.
Check at http://www.cfd-online.com/Forums/ans...nt-places.html

Do you mean inflation? As I am using sweep method, ANSYS does not allow to create inflation for 3D Airfoil on the boundaries.

cfd seeker August 7, 2012 09:45

Quote:

Originally Posted by Julian121 (Post 375789)
I have never used hexahedral mesh before. I don't know how to do it.

I have changed the mesh and used triangular mesh. How is that now? Is it acceptable?

http://www.youtube.com/watch?v=tYrbScUH9RE
http://www.youtube.com/watch?v=EknKVAJGEJ8
http://www.youtube.com/watch?v=6wQPeBpvwCk

here are the video tutorials for strctured hexa meshing on aerofoil...hope it helps have fun

flotus1 August 7, 2012 10:12

Quote:

Originally Posted by Julian121 (Post 375825)
Do you mean inflation? As I am using sweep method, ANSYS does not allow to create inflation for 3D Airfoil on the boundaries.

I see no point in sweeping a tet mesh.
The tutorials brought up by cfd seeker should render this discussion pointless. Use ICEM if you want to create reliable results on a high quality mesh.

Julian121 August 8, 2012 13:53

Quote:

Originally Posted by flotus1 (Post 375841)
I see no point in sweeping a tet mesh.
The tutorials brought up by cfd seeker should render this discussion pointless. Use ICEM if you want to create reliable results on a high quality mesh.

Could you tell me how I can reduce the transition speed between cells in ANSYS meshing? I am not familiar with ICEM.

flotus1 August 8, 2012 16:47

I think there is an option called "transition" or "growth factor" in hidden in the settings. I really don't know exactly.

But I can tell you: The time spent learning ICEM is well-wasted.
It is even the faster way to achieve a reasonable mesh quality in this case.
With the tutorials posted here, you will be done in only a few hours.

Julian121 August 8, 2012 19:17

1 Attachment(s)
Quote:

Originally Posted by flotus1 (Post 376089)
I think there is an option called "transition" or "growth factor" in hidden in the settings. I really don't know exactly.

But I can tell you: The time spent learning ICEM is well-wasted.
It is even the faster way to achieve a reasonable mesh quality in this case.
With the tutorials posted here, you will be done in only a few hours.

Thank you Alex. I found that option. How is the mesh now?

flotus1 August 9, 2012 02:49

It still hurts my eyes ;)
But I guess if you are committed to the Ansys Mesher, this is the best you will get.

Quote:

the volume jump between the last cell of the prism layers and the first cell of the regular mesh is far too high.
This still holds true.

gus.gkikas March 28, 2013 09:05

Hello!

I have a few question on this subject!

I am working on a project,pretty much the same as Julian121,and i have a problem with meshing on airfoil too.

I want to ask,if I can mesh a boundary geometry (including the airfoil shape) with ICEM,and if the export file of the ICEM can import in Ansys mesher,in order to continue the project on the workbench.

Thanks!

I am waiting for your responses! :)


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