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Environment: Results |
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Environment: Results |
For general information on selecting and producing results, see the producing results topic.
For environment results you must specify the global $X,Y,Z$ coordinates of the point for which you want results. A value of ~ for the $Z$-coordinate is interpreted as the instantaneous sea surface elevation at the $(X,Y)$ position (but see below regarding velocity and acceleration with a disturbance vessel).
Results are for the sea conditions that apply during the simulation and therefore include the build-up of wave motion during the build-up period.
The global $Z$-coordinate of the sea surface at the given global $(X,Y)$ position. You may also specify that the results should be subject to sea state disturbance due to the presence of a disturbance vessel. The option to select a disturbance vessel will only be visible if there is at least one vessel in the model that has sea state RAO data associated with it.
The magnitude and global $X, Y\text{ and }Z$ components of the water particle velocity (due to current and waves) and acceleration (due to waves) at the given $(X,Y,Z)$ position. If $Z$ is below the seabed then the result at the seabed is reported. A disturbance vessel may also be selected to have an influence on the reported results. If, however, the sea state RAO data associated with this disturbance vessel use the direction and period only sea state RAO interpolation option, then choosing a value of ~ for the $Z$-coordinate will compute the requested result at the instantaneous sea surface using the sea state RAO data corresponding to $Z$ being the mean sea surface elevation.
| Notes: | These results can be non-zero for points above the water surface. This is required in OrcaFlex to avoid discontinuous changes in fluid loading for objects close to the surface. The transition between fully submerged loading and fully emerged loading is handled by scaling the fully submerged load value by the proportion wet of the object. Since objects can be above the water surface and yet have non-zero proportion wet, it is essential that the fluid velocity and fluid acceleration are continuous functions through the water surface. For linear waves, the calculation of fluid velocity and fluid acceleration for points above the water surface is determined by the kinematic stretching method. For nonlinear waves, the values at points above the water surface are taken to be the values at the water surface. |
| All wave kinematics results are calculated using the instantaneous position (exact) wave calculation method. The choice of wave calculation method specified on the environment form does not alter this behaviour. |
The speed and direction of the current at $(X,Y,Z)$.
The wind speed and direction at $(X,Y,Z)$.
The global $X, Y\text{ and }Z$ components of the wind velocity at $(X,Y,Z)$.
The pressure due to the static head of water at $(X,Y,Z)$.
The density of the water at $(X,Y,Z)$.
The $Z$-coordinate of the seabed at $(X,Y)$.