Vessel data: Properties report

The vessel properties report is available from the popup menu on the data form. It reports the following:

Length

The length of the vessel.

Wave direction relative to vessel

The relative wave direction. If there is more than one wave train then the direction of the first wave train is used.

Statics force accuracy, statics moment accuracy

These are only reported if the vessel is included in statics.

The static analysis searches for an equilibrium position for the vessel – that is, a position for which the resultant force and moment on the vessel 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 statics force accuracy is $\textit{tol} \times |\vec{f}_\textrm{char}|$ and the statics moment accuracy $\textit{tol} \times |\vec{m}_\textrm{char}|$, where $\textit{tol}$ is the whole system statics tolerance and the characteristic force, $\vec{f}_\textrm{char}$, and characteristic moment, $\vec{m}_\textrm{char}$, are calculated internally based on the forces and moments applied by coupled objects.

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 finite numerical precision.