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BC in cylindrical coordinates
- Thread starter elkhorn
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If you have a quarter solid or shell model of a cylinder and are applying symmetry boundary conditions then you can just apply the boundary conditions in the global XY co-ordinates, presuming the sides of the model are on the global planes.
ex-corus (semi-detached)
ex-corus (semi-detached)
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Thanks to both of you (Corus and PamCrash) for your respondings.
I wanted to give some additional detail. Responding to Corus: my 1/4 model is such that the right section is 45deg in positive-x and the left section is 45deg in negative-x.
Therefore, the sides of the model are not paralel to the global X-Y coordinates.
Again thank you for your insight.
I wanted to give some additional detail. Responding to Corus: my 1/4 model is such that the right section is 45deg in positive-x and the left section is 45deg in negative-x.
Therefore, the sides of the model are not paralel to the global X-Y coordinates.
Again thank you for your insight.
You could rotate the model by 45 degrees to get the faces to line up with global axis planes.
If you don't mind me bringing this issue up again and hijacking your thread....
I am doing a very similar analysis. I have a quarter symmetry model of a washer. I am putting a cylindrical displacement BC to the ID in the first displacement step. However, I cannot use the X- and Y-symmetry BC's because the displacement and symmetry planes are in different coordinate systems. How can I either 1) apply a cylindrical displacement in x,y,z CS, or 2) get a radial symmetry BC for the quarter-symmetry model? I'm a GUI guy and don't know how to write script into the input file (infact an input file can't be generated because of this problem).
Thanks!
I am doing a very similar analysis. I have a quarter symmetry model of a washer. I am putting a cylindrical displacement BC to the ID in the first displacement step. However, I cannot use the X- and Y-symmetry BC's because the displacement and symmetry planes are in different coordinate systems. How can I either 1) apply a cylindrical displacement in x,y,z CS, or 2) get a radial symmetry BC for the quarter-symmetry model? I'm a GUI guy and don't know how to write script into the input file (infact an input file can't be generated because of this problem).
Thanks!
@bues0022
Have a look at using an MPC Slider constraint. It constrains nodes between to given reference nodes to remain in a straight line, allowing symmetry constraints to be placed independently of co-ordinate system or part deformation.
Its not supported by CAE but c'mon...its one line one code in the INP file!
Have a look at using an MPC Slider constraint. It constrains nodes between to given reference nodes to remain in a straight line, allowing symmetry constraints to be placed independently of co-ordinate system or part deformation.
Its not supported by CAE but c'mon...its one line one code in the INP file!
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