OrcaFlex Manual - Orcina

System Modelling: Data and Results, Shapes
6.13.3 Cylinders
r = Inner Radius
R = Outer Radius
R
r
End 1 Position
A cylinder shape is a thick walled hollow pipe defined by giving:
� Inner and Outer Diameter.
� Length.
� Azimuth and Declination of the axis.
426
End 2 Position
w
The azimuth and declination define the direction of the axis relative to the local axes of the object to which the end is
connected. For objects that rotate, such as vessels and 6D buoys, the axis direction therefore rotates with the object.
For Fixed or Anchored ends it is defined relative to global axes.
Cylinders are drawn using circles to represent the end faces and a number of rectangular facets to represent around
the curved surfaces. The number of facets used is the Number of Lines specified. Two gives a very simple wire frame
profile of the cylinder, whilst a very large number gives a pseudo-opaque cylinder at the expense of drawing speed.
If the Inner Diameter is zero then a solid disc is formed.
If the cylinder is an elastic solid then reaction forces are applied:
� Radially inwards if an object comes into contact with the inner curved surface.
� Radially outwards if an object comes into contact with the outer curved surface.
� Normally outwards if an object comes into contact with one of the end faces.
6.13.4 Curved Plates
Figure: Some example curved plate shapes