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iffy February 4, 2011 06:37

simulating 2D airfoil mesh in CFX
I need to calculate boundary layer characteristics for 2D airfoil. For this I made 2D mesh in ICEM CFD (exactly following Simon's tutorial). As CFX cannot handle 2D so I tried to convert it to 3D. I have read previous threads regarding how to do this. I have tried following 2 ways.
1) converting mesh file into Fluent output file. This way works to some extent but when I open this fluent mesh file into CFX, I cannot see some of the boundaries in CFX. I defined inlet, outlet, wall, top, bottom etc in ICEM CFD and when I open mesh file in CFX I can only see some of the boundaries there not all of them. Can anyone here has some idea about the reason for this and how to handle this?
2) I also tried extruding the 2D mesh by one cell to make it 3D. Although I define the curves in the parts which I want them as boundaries (the curves are associated to the edges) but still in CFX, I cannot see any boundaries where I can put the bocos. Can anyone knows something about this.
I will really any suggestion/advice regarding this.


saisanthoshm88 February 4, 2011 08:15

Well this question has been asked for a number of times on the forum before. you need to check the associations made once again because the line elements are generated only on those edges which are associated to the geometry you might have made the associations correctly in the begining but there can be some disassociations occuring when you do operations like split edges etc.., so to be sure of the associations have a look at the line elements before exporting the mesh just turn on the line elements but turn off the shell elements in the model tree to do that.

vmlxb6 March 3, 2011 04:59

Are you following the tutorial on you tube ???? Then you must be making a silly mistake here or there ??????? I have tried it and it works well.

lenovosk March 8, 2011 12:35

I agree with saisanthoshm88.

iffy March 9, 2011 03:53

Hi Santhosh, vmlxb6 & Lenovosk:

Thank you for your replies and useful suggestions. I managed to solve this problem. There was some problem with the geometry association as Santhosh pointed out.
But now I come across another problem: I want to determine laminar to turbulent transition for an airfoil for which I need the mesh to be orthogonal. Somehow I could not make the mesh perfectly orthogonal. I have tried smoothing option but it always distorts the mesh.
I will appreciate if anyone here can provide some suggestion to resolve this.



vmlxb6 March 9, 2011 04:10

@ iffy
One way I know is to specify the first layer distance from the boundary wall. It also makes sure that the first set of elements or BL is orthogonal. In the tutorial provided by Simon on you tube, When he does smoothing, he specifies the orthogonal distance first.

Am I on the right track ??? Is this what you wanted ???

iffy March 9, 2011 04:53

Actually I have tried this option, it works to some extent. It makes first layer in the boundary layer region orthogonal but it distorts the mesh everywhere around. I am looking for some other option/function in ICEM.

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