Now I change absolute accuracy and shell elements can be made as long profile as I want. So, the length of the profile or shell elements is not the problem. Still I am not sure what is the best constraint method. I tried edge constraint and the result is better.
Some says that I should use hard curve, but I did not notice any differencies. I am not sure what is the meaning of the hard curve, -point or -surface.
And should I fix all translations and rotations or use different coordinate system (cylindrical)?
There are two different type of supports, 2-support and 3- support (in the middle) when the length is over 6000mm.
