Axial friction resists sliding motion along a support cylinder axis, while normal friction resists sliding motion that would drag a line over or around a support.įor the most part it should be clear how the data are interpreted. The axial and normal directions for friction between lines and supports are defined by the support cylinders. Note:įriction between lines and elastic solids or between lines and the seabed defines axial and normal directions using the line nodes. If the axial coefficient is set to '~' then the normal friction coefficient is used for all directions of motion. In much the same way as the line types table above, you can give friction coefficients for '(all support types)' and/or '(all lines)'. Note that lines are listed in this table, whereas line types are used in the specification of friction with elastic solids. The given friction coefficients will be used for contact between the specified line and any support which uses the specified support type.

This table contains a user-defined number of rows, each containing the following data: Support type, line Instead of line types, you specify 3D buoys or 6D buoys, and there is only a single friction coefficient, because buoy friction in OrcaFlex is isotropic.

These tables are entirely analogous to the line types table. Similarly, and independently of the line type setting, the shape can be '(all shapes)'. In this case, any node in the model, irrespective of the line type it is based on, will use the given friction coefficients when in contact with the specified shape. The line type name can also be '(all line types)'. The given friction coefficients will be used for contact between the specified shape and any node which uses the specified line type. The table contains a user-defined number of rows, each containing the following data: Line type, shape support types for contact between supports and supported lines.3D buoys for contact between 3D buoys and elastic solids.6D buoys for contact between 6D buoys and elastic solids.line types for contact between lines and elastic solids.The data comprise friction coefficients defined in the following tables: Note:įriction for contact with elastic solids or with supports is only included during the dynamic simulation, and not in statics. As a result, the specification of these data is more complex than that for seabed friction coefficients. The situation with supports is similar, supports can have multiple supported lines, and a line can be supported by many supports. Contact interactions are many-to-many each elastic solid can come into contact with any number of lines and buoys, and vice versa. These data are the friction coefficients for contact with either elastic solids or supports.

Orcaflex seabed friction coefficients