# Creation of cylindrical thin shell structure

Hello,

I am new to CUBIT and would like to create a thin shell structure. I wrote a python script for the same and it is as follows,

#!python
cubit.cmd(‘reset’)

cubit.cmd(‘create vertex -3.20 0 0’)
cubit.cmd(‘create vertex 0 0 0’)
cubit.cmd(‘create vertex 3.20 0 0’)

cubit.cmd(‘create vertex -2.93 0 0’)
cubit.cmd(‘create vertex 2.93 0 0’)

cubit.cmd(‘create curve arc center vertex 2 4 5 radius 2.93 normal y’)
cubit.cmd(‘create curve arc center vertex 2 1 3 radius 3.20 normal y’)

cubit.cmd(‘create curve 4 1’)
cubit.cmd(‘create curve 3 5’)

cubit.cmd(‘create surface 1 2 3 4’)
cubit.cmd(‘curve 4,3 interval 1’)
cubit.cmd(‘surface 1 scheme map’)
cubit.cmd(‘mesh surface 1’)

cubit.cmd('sweep surface 1 perpendicular distance 40 ')

cubit.cmd(‘curve 8,12 interval 1’)
cubit.cmd(‘surface 6 scheme map’)
cubit.cmd(‘mesh surface 6’)

cubit.cmd(‘curve all with length 40 interval 20’)
cubit.cmd(‘block 1 volume 1’)
cubit.cmd(‘block 1 element type HEX27’)
cubit.cmd(‘mesh volume 1’)

However CUBIT 13.2 is not accepting floating point numbers as vertices (i.e. in lines 4,6,8 and 9, the vertices -3.20, 3.20, 2.93 and -2.93 are converted to -3,3,2 and -2). Hence my shell thickness becomes 1 unit which is wrong. I would like to know if my method is the right way to create a thin shell structure or if there is another way?

Thank you!

I don’t see the same problem in Trelis or Cubit 15.3 (thickness is .27). We don’t support Cubit 13.2 anymore (released 2012). You might contact Sales to update your license (sales@csimsoft.com).

Thank you for your reply! I guess its a problem with my version of CUBIT.