Multiple Shell Sections in one Model not working?

Hello,

At the moment I am testing PrePoMax 2.1.0 for the buckling analysis of a wind turbine tower, the tower is a shell with multiple different sections (different wall thicknesses


).

I start with a “Buckle” Analysis and it seems to me that PrePoMax can only handle 2 different sections, If I use only 2 Sections I get about the expected result (buckling factor = 3.4), If I try more than 2 different sections I get (buckling factor = 1).

“Update: During writing of the post I tried the same analysis with quadelement and second order and it works ! in the first try I used only linear tri elements. Still strange error though”

I would avoid them in CalculiX - one such example: Calculix vs Nastran big difference in results for shells - #22 by synt