Support structure
General
Vertical offset
The Vertical offset can position the support structure on a different vertical position (elevation) than the ground level (seabed level if offshore). The Vertical offset can be both positive and negative. A positive value means that the bottom (base) of the support section is above the ground/seabed, whereas a negative means that the base is in below (into) the ground/seabed.
This is relevant to use in e.g. the following four instances:
• Onshore: The support structure has a base that shall be modelled infinitely stiff (e.g. a concrete slab)
• Monopile, offshore: For a monopile, a negative value means the structure is embedded into the ground/seabed.
• Truss tower with piles, offshore: For a truss tower with piles, vertical offset must be used to get the piles into the seabed
• Offshore, bottom fixed: The waves shall be simulated with a different depth (i.e. the ground) than the foundation (base) of the support structure
Note:
- This parameter is not visible for floaters
- For bottom-fixed offshore wind turbines, this parameter cannot be greater than the still water depth (SWL). If a greater value is set, it will be auto-corrected to the still water depth. This implies that the bottom (base) of an offshore support section (e.g. monopile) cannot be above the SWL.
- Default value: 0
- Unit: $\text{m}$
- Range: -100 — 1000
Draft scheme
Choose how the draft of the floater is set.
Options:
Set fraction (default):
Set the draft as a fraction of the height of the floater.
Set explicitly:
Set the draft excplicitly.
Draft fraction
The draft of the floater set as a fraction (0% to 100%) of the height of the floater.
- Default value: 75
- Unit: —
- Range: 0.001 — 100
Draft
The draft of the floater (set explicitly as opposed to a fraction). If you set the draft larger than the depth of the seabed, the draft will be adjusted to the seabed.
The draft can have a negative value meaning that the floater is completely dry and will fall into the sea.
- Default value: 1000
- Unit: $\text{m}$
- Range: -1000 — 1000
Initial surge position
The initial platform position in the surge direction.
- Default value: 0
- Unit: —
- Range: -2.14748e+09 — 2.14748e+09
Initial sway position
The initial position of the platform in the sway direction. A positive sway means left when looking downwind.
- Default value: 0
- Unit: —
- Range: -2.14748e+09 — 2.14748e+09
Scaling factor
The geometry of the support structure sub parts defined by parameters and/or files will be scaled by this factor (unless overridden by a scale factor in the individual sub part). This parameter is only active (and visible) if Local scaling is chosen for Scaling scheme at the Wind turbine part.
- Default value: 1
- Unit: —
- Range: 1e-06 — 1e+06
2 Python script
- Automatically: you will then have to select the Python script that will be run, and once you start the simulation this script will be automatically called.
- Manually: you won't have to select the Python script in Ashes. Once you start the simulation, a window will appear with a countdown. You have until the end of the countdown to go to the Python script that you want to run and start it manually. This is useful for example when you want to debug your controller.