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Rectangular face with 5 curves after breaking by curve

Rectangular face with 5 curves after breaking by curve

Rectangular face with 5 curves after breaking by curve

(OP)
Hey guys!

I'm facing quite strange problem with my model. I'm in the middle of stress analysis of the aeroplane wing. Actually, I'm stuck on the model before meshing and computing... First something about my model. It is a surface model extracted from solid model drawn in NX (using parasolid export/import option). There is a flap planned in my project, so trailing edge is not straight, so I had to divide the upper and lower surface into 4 separate pieces (2 for each surface) using one rib's curve and here comes the problem. One surface divides perfectly without a problem, while the second gives mess... I got a rectangular surface with 5 curves, there is no way to delete one of them, composite them (well, there is, but the result is a little bit different than expected). I've been trying to solve it for quite a while and still can't figure it out... I hope screens added will be helpful. Any ideas how to bite it?

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