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Old   March 26, 2013, 20:36
Default Meshing 3d Blade
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So I'm trying to create a mesh around a 3d Blade (NACA 0012) that has the top part covered. Although I've managed to get the mesh on the surface on which the blade lies with rather good quality, I do have big problems getting a good quality mesh on the aforementioned cover.

You can see the whole geometry in Fig 1 and the cover in Fig 2.
In Fig 3 and 4 you can see the blocking and finally in Fig 5 and 6 you can see the mesh quality results in Determinant2x2x2 and Min Angle (on the one side of the top of the trailing edge) respectively. I've also attached the project if anyone wants to look around.

Any tips? I primarily want to find a way so that I avoid those low quality elements on the top of the blade.
Attached Images
File Type: jpg fig1.jpg (20.4 KB, 31 views)
File Type: jpg fig2.jpg (10.4 KB, 33 views)
File Type: jpg fig3.jpg (18.7 KB, 24 views)
File Type: jpg fig4.jpg (19.4 KB, 24 views)
File Type: jpg fig5.jpg (45.8 KB, 25 views)
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Old   March 26, 2013, 20:37
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Here's Fig 6 and the project files.
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File Type: jpg fig6.jpg (46.1 KB, 14 views)
Attached Files
File Type: zip blade3d.zip (41.7 KB, 6 views)
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Old   March 26, 2013, 20:50
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This thread may be helpful to you:

Structured Hexa Mesh on Wing
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Old   March 27, 2013, 09:06
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Thanks for the fast reply Far. Just one question: Considering the tip on my wing is not flat, how much should I expect things to change? Or do I just follow the same procedure and I'm set?

And if I may ask, what's the command to make an edge round like you have done in some of your methods?

Last edited by Adramelch; March 27, 2013 at 09:29.
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Old   March 27, 2013, 11:59
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If tip is not round then you may you need to put o-grid around tip instead of extending o-grid into farfield.

To make edge round, go to edit edge and use either spline, automatic linear etc . There is another option which will make the edge to follow the shape of another edge. .
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Old   March 28, 2013, 18:21
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I have made this:





which is pretty much how I want the mesh to be, however the quality isn't all that good.

Anyone more experienced in this can take a look and tell me what I could do to improve the quality?
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File Type: zip naca0012.zip (32.9 KB, 9 views)
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Old   March 29, 2013, 11:29
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I know it's mostly solver related but do you think with a minimum quality of 0.22 for Determinant2x2x2 and 10.2 for minimum angle I'll be fine?
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Old   March 29, 2013, 11:33
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Start reading from post # 51 Blade tip blocking

The quality is good enough. But you may improve it by employing appropriate topology.

Last edited by Far; March 29, 2013 at 11:53.
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Old   April 1, 2013, 09:16
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I got the quality up to a minimum angle of 12.8 and a minimum Determinant2x2x2 of 0.316 having converted the o-grid to a c-type (as it's generally more appropriate for sharp trailing edges), but I'm not entirely sure what else I could improve. Not exactly sure what changes I could do to topology that would help me.

Last edited by Adramelch; April 1, 2013 at 11:56.
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Old   April 1, 2013, 12:00
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Did you change the topology?

Try your mesh in solver and see what happens. Solvers are more tolerant to mesh than described in help manuals.
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Old   April 1, 2013, 12:19
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Ah, just looked at project and found that topology is not correct. You need special attention at round tip.
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