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Let's take a look at the naca4412.dat file:Image Removed

256    2   
0    0    0
-0.00019628    0.001241474    0
-0.000247836    0.001759397    0
-0.000275577    0.002158277    0
-0.000290986    0.002495536    0
-0.000298515    0.002793415    0
-0.000300443    0.00306332    0

The first line of the file represents the number of points on each edge (61256) and the number of edges (2). The first 61 256 set of vertices are connected to form the edge corresponding to the upper surface; the next 61 256 are connected to form the edge for the lower surface.

The chord length, c for the geometry in naca4412.dat file is 1, so x varies between 0 and 1. If you are using a different airfoil geometry specification file, note the range of x values in the file and determine the chord length c. You will need this later on.Note: NACA series geometry can be found in many online website. One such website is:
http://www.pagendarm.de/trapp/programming/java/profiles/NACA4.html

Main Menu > File > Import > ICEM Input ...
For File Name, browse and select the naca4412.dat file. Select both Vertices and Edges under Geometry to Create: since these are the geometric entities we need to create. Deselect Face. Click Accept.

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