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Odd mesh in aerofoil

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Old   December 3, 2012, 17:54
Default Odd mesh in aerofoil
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Eleanor V
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Hi all,

I have attempted to mesh a box around a naca aerofoil to simulate the flow field. However, when I try to refine the mesh it creates odd parts inside the aerofoil. Im pretty sure it isnt the CAD as i have it working on another simulation.

The only problem that I thought it might be is because I said to use Prism layers but it hasnt put any on.

I have attached a picture with the weird mesh, and any thoughts as to why that is happening or why the prism layers arent showing up would be really helpful, thanks!
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File Type: png NACA0012rectangle_Copy_Copy_Mesh Scene 1.png (89.8 KB, 38 views)
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Old   December 4, 2012, 21:59
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Try to reduce the surface cell size maybe?
You can try to do the surface mesh first (no need to perform the volume mesh) and then see how does the mesh looks like. You can also post the picture here.
It might be that the surface mesh representation is not good so that it creates a bad volume mesh
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Old   December 8, 2012, 18:49
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Eleanor V
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Thank you for your reply, unfortunately changing the surface mesh first doesnt seem to help. The problem seems to happen as I refine the mesh. if i have a fairly coarse mesh, giving a crude outline of the aerofoil it is fine, and then as i refine it, it gives these weird shapes (shown in above picture). if I then make it coarse again, they go away-or at least get a lot better.

Any thoughts would be appreciated! Thank you
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Old   December 9, 2012, 07:24
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maybe try and add contact prevention?
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Old   December 9, 2012, 12:31
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Hi Shyam 88,

How would I do that please?

Thank you
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Old   December 9, 2012, 13:30
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regions > air > mesh values > contact prevention, right click new, one group contact prevention.

select boundaries, ie airfoil
search floor - make it really small in comparison to your mesh size.
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Old   December 13, 2012, 16:54
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Hi,

thanks thats great. Thanks for your help
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