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[GAMBIT] 3D Airfoil (wing) meshing

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Old   September 15, 2015, 04:28
Exclamation 3D Airfoil (wing) meshing
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Hi,
I'm trying to mesh a 3d airfoil (it's not exactly a wing) but it doesn't end well. after creating the model in 2d, I swept it and a 3d model was created. the 2d meshing is done well. I did it as told in the link below.
https://confluence.cornell.edu/displ...irfoil-+Step+2
the volume mesh of the 2 cubes in the left was done without any problems but the area around the airfoil itself can not be done. if I choose no scheme and spacing it shows the error in the image below.


it says I have to check the skewness which I did and there was no problem when meshing the faces. about the sizes, I did it with smaller and larger size too, but didn't worh either way.
I also triedmeshing with various schemes which gave different errors.
Help plese!!!
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Old   September 15, 2015, 05:26
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can you zoom on your airfoil
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Old   September 15, 2015, 06:53
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yes, ofcourse. here are 2 pictures that I had already. if you need a picture with more zooming in or from a different view, tell me.
and thank you.


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Old   September 15, 2015, 07:18
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can you provide the dbs file on a share server
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Old   September 15, 2015, 07:42
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here's the link for the uploaded file.
https://mega.nz/#!M45kjSBQ!ThFgUHWCj...qZUpzxS3Ww4m_o
it's a .RAR file with all the gambit files included. and the airfoil is a NACA0021 in case you need to know.
thanks.
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Old   September 30, 2015, 07:42
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found the problem. have to do the meshing with cooper but it doesn't work with 2 faces connecting to each other with one edge. so the trailing edge should have a small gap and the two half circles of boundary must be connected with two edges that have formed the trailing edge.
now another problem has risen. no matter how I change the interval size for volume mesh, nothing changes. I want to make smaller mesh elements. can anyone help please?!!!
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Old   October 5, 2015, 00:56
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If you are working with cooper, and all your edges are already meshed, then the element size of your volume won't affect the real size element.
Other possibility: you have set a size function
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Old   October 5, 2015, 07:47
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I haven't meshed all the edges. the edges between the main faces and the ones that were sweeped are not meshed. also even if I don't aply the scheme, no matter how much I change the spacing, the element size and amount does not change.
I actually don't know what the size function is.
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Old   October 5, 2015, 08:04
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upload your file on a share server (zip format please)
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Old   October 6, 2015, 10:46
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here's the link of the uploaded file.
https://mega.nz/#!w9RQyTSJ!pykMwoZvm...kJcZEwxHGKd2Sc
thanks.
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Old   October 7, 2015, 04:15
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Look at your faces 11 15 16 18 & 19
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Old   October 9, 2015, 06:11
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Sorry but what do you mean by looking at those faces? what do I do with them?
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Old   October 9, 2015, 06:24
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If you check those faces, you will see that they are still meshed.
Then the mesh size in x-direction is fixed (because of those faces)
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Old   October 9, 2015, 13:47
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Oh, I know that. I can already change mesh in x and y directions. I want to change the mesh in the z direction. but it doesn't allow me to do it.
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Old   October 12, 2015, 01:25
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then you need to delete the mesh of your source faces (13;20;Rect1, Circ and so on..)
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Old   October 13, 2015, 07:25
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But I want to keep those face meshes as they are. if I delete them, the program will mesh them with a default mesh, won't it?
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Old   October 13, 2015, 07:44
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wait I mixed x and z direction.
3D Airfoil (wing) meshing post #13
I was talking about z-direction
So if you delete mesh on faces 11 15 16 18 & 19 , then you will be able to refine your volume mesh in z-direction
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Old   October 13, 2015, 08:26
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Thanks, I'll try and let you know the results.

LATER:
Thanks a lot. you've really saved me!

Last edited by Athos1387; October 14, 2015 at 09:18.
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