I cannot thank you enough for providing such a wonderful software, netgen, which I use most of my meshing work.
I have a technical question of netgen meshing using an STL file of a plate heat exchanger.
The length and width are 1 m and the thickness is 7 mm. The top and bottom surfaces are curvy and four sides are perpendicular. So, it literally looks like a book or magazine dried after someone spilled water on it.
I was able to make a mesh directly from the STL file, using a command line with -batchmode option to netgen mesh (.vol) and neutral format. Since I have many pieces, I would like to do this without using GUI too much. As I have technically six surfaces, i.e., top, bottom, left, right, front and back. I would like to have distinct six boundary numbers. In some cases, netgen did what I expected, and I guessed that netgen understands an angle between two surfaces and assign a single boundary number per distinct surface. Unfortunately, it was not general for all the cases.
So, I would like to know if there is any method that I can assign specific boundary numbers to surfaces of unique conditions. For example, the left and right surfaces have points that have the minimum and maximum in x-axis, and similar to the front and back surfaces in y-axis.
Could you please let me know or suggest any methods?
Thank you so much.