I want to draw a shape of piston (that is attached) in Auto CAD and save it in dxf format and then import it in AVL Fire in ESE Diesle part.

after draw it in CAD when i import it in ESE occur an error

''contour in piston file is not closed''

I don't know how exactly draw it in CAD?

with pline, spline or ....?

how to close the shape of the attached file in CAD?

as you know i draw it in 2D.

Many thanks,

Masoud

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