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[ANSYS Meshing] Airfoil Meshing Pinch Control Tolerance

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Old   November 17, 2014, 08:00
Default Airfoil Meshing Pinch Control Tolerance
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Diego Garcia Pardo
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Hi all,

Anyone has had this problem before?

"At least one pinch control has tolerance below one or several scoped size control. Reduce tolerance or remove any pinch control in close proximity with of any of such scoped size controls"

I have tried to reduce pinch tolerance but it doesn't work.

I attach a screen capture. I would like to make the mesh more uniform over the upper side of the airfoil.

Thanks
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File Type: jpg Airfoil_Mesh.jpg (78.5 KB, 224 views)
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Old   January 19, 2015, 09:51
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Hi, I have the same problem, did you fix it?
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Old   February 24, 2015, 18:35
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I have had this same issue as well. When I import the mesh into Fluent it results in ridiculous numbers for the lift and drag coefficients on my airfoil. My y+ values are correct for my turbulence model. I'm assuming this pinch issue might be causing this.

Has anyone found a solution to this? I'm getting really annoyed using Ansys Meshing. I have found it easier to use then ICEM in many ways but I might just suck it up and figure out ICEM if it gives me a better mesh. If anybody has a solution to this or any input on the problem please let me know. I have attached some pictures of my mesh.
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File Type: png naca0009_mesh1.PNG (24.6 KB, 98 views)
File Type: jpg naca0009_mesh1_LE.jpg (63.8 KB, 88 views)
File Type: jpg naca0009_mesh1_TE.jpg (50.5 KB, 80 views)
File Type: jpg naca0009_mesh1_airfoil.jpg (68.9 KB, 85 views)
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Old   February 24, 2015, 18:45
Default Not solution, but WorkAround
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Diego Garcia Pardo
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Hi!

I manage to workaround the problem by creating surfaces splits. I made the original cad with solidworks, So I just splitted the surfaces in solidworks and then import them back into Ansys.

This however is a really tedious process.

Recently I've been able to see that unstructured grids give less trouble when meshing, even though as it is well known, the loss of control over the mesh usually means that the control volumes are not perpendicular to the flow field thus tending to increase numerical error.

Ansys mesh is simply not the best tool to mesh, but I haven't found any way better so far.

I can't help much more, I am quite a beginner in this world.
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Old   June 8, 2015, 13:36
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starker
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anyone know how to solve this problem?
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Old   April 30, 2016, 02:46
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Quote:
Originally Posted by starker View Post
anyone know how to solve this problem?
if you do right click on mesh and "Create Pinch Controls", the warning disappears.
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Old   January 16, 2019, 18:12
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Quote:
Originally Posted by diegojolin View Post
Hi!

I manage to workaround the problem by creating surfaces splits. I made the original cad with solidworks, So I just splitted the surfaces in solidworks and then import them back into Ansys.

This however is a really tedious process.

Recently I've been able to see that unstructured grids give less trouble when meshing, even though as it is well known, the loss of control over the mesh usually means that the control volumes are not perpendicular to the flow field thus tending to increase numerical error.

Ansys mesh is simply not the best tool to mesh, but I haven't found any way better so far.

I can't help much more, I am quite a beginner in this world.
can you help me and explain that by images.
thank you in advance.
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