[Athos1387]

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!!!

[-mAx-]

can you zoom on your airfoil

[Athos1387]

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.

[-mAx-]

can you provide the dbs file on a share server

[Athos1387]

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.

[Athos1387]

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?!!!

[-mAx-]

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

[Athos1387]

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.

[-mAx-]

upload your file on a share server (zip format please)

[Athos1387]

here's the link of the uploaded file.
https://mega.nz/#!w9RQyTSJ!pykMwoZvm...kJcZEwxHGKd2Sc
thanks.

[-mAx-]

Look at your faces 11 15 16 18 & 19

[Athos1387]

Sorry but what do you mean by looking at those faces? what do I do with them?

[-mAx-]

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)

[Athos1387]

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.

[-mAx-]

then you need to delete the mesh of your source faces (13;20;Rect1, Circ and so on..)

[Athos1387]

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?

[-mAx-]

wait I mixed x and z direction.
http://www.cfd-online.com/Forums/ans...tml#post567293 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

[Athos1387]

Thanks, I'll try and let you know the results.

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