OrcaFlex Manual - Orcina

System Modelling: Data and Results, Lines
Total wet weight (including contents)
Equals Total weight in air (including contents) - Total line displacement.
Full Statics force accuracy, Full Statics moment accuracy
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Full Statics force accuracy is only reported if the line uses the Full Statics method. Full Statics moment accuracy is
only reported if the line uses the Full Statics method and torsion is included.
The Full Statics method finds an equilibrium configuration – that is a set of node positions for which the resultant
force and moment on each node is zero. We refer to the resultant force and moment as the out of balance load.
Because computers have limited numerical precision the static analysis cannot always find a configuration where
the out of balance load is exactly zero. OrcaFlex accepts a position as a static equilibrium position if the largest out of
balance load component is less than the statics accuracy.
The Full Statics force accuracy equals Tolerance * [line typical force] and the Full Statics moment accuracy equals
Tolerance * [line typical moment]. The line typical force is defined to be the total weight in air. The line typical
moment is defined to be [total weight in air] * [total length].
Reducing the Tolerance value will give a more accurate static equilibrium position, but will take more iterations.
OrcaFlex may not be able to achieve the Tolerance specified if it is too small, since the computer has limited
numerical precision.
Details page
This contains a spreadsheet with the following information:
� The values reported on the Summary page, as described above.
� Properties for each line type used by the line: weight in air, weight in water, displacement etc.
� Properties for each section of the line. This table includes details of segmentation, structure, hydrodynamics,
contact and friction. When the section's line type uses a profiled diameter the properties are reported for each
segment in that section.
If the line uses a P-y model then a page of detailed output is included which describes how the P-y model data has
been interpreted.
6.8.2 Line Types
Data
The Line Types form defines the properties of a number of named line types, which can then be used to specify the
structure of the Lines used in the model.
The line types form must include all the line types referred to on all of the Lines forms, but it can also include other
line types that are not currently in use in the model. This allows you to build up a library of standard line types
which can then be easily used when building Lines.
There is not enough room on the screen to show all the properties of all the line types, so OrcaFlex offers different
view modes:
� Individual mode shows one line type at a time, but shows you all its properties.
� All mode shows all the line types, but different types of properties are shown in different tables.
� Code Checks mode shows data used for post-processing code checks.
� External Function Parameters mode shows the data used by any external functions referenced by the Line
Type.
The Line Type Wizard is available to help set up line type data to represent commonly used structures such as
chains, ropes etc.
Line Type Name
Used to refer to the Line Type.
Category
Can be one of the following options.