IceDyn
The IceDyn panel configures ice loading on offshore structures in arctic and sub-arctic environments. Click IceDyn under OFFSHORE in the sidebar to open it. IceDyn is only active when CompIce = 2 in the primary .fst file.
What this panel controls
Section titled “What this panel controls”IceDyn computes deterministic or stochastic ice loading on a vertical cylindrical structure (monopile). The panel is organised into three tabs: Overview, Ice Properties, and Output.
Ice loading model
Section titled “Ice loading model”IceModel | Description |
|---|---|
1 | Crushable ice — intermittent crushing loads against a vertical pile. Most common for Baltic monopiles |
2 | Brittle spalling — fatigue loading from repeated crack formation |
3 | Buckling — relevant for colder, thicker first-year ice |
4 | Narrow wedge — loading from a moving wedge-shaped ice floe |
Key ice properties
Section titled “Key ice properties”| Setting | Description |
|---|---|
IceDens | Ice density (kg/m³). Typical value: 900 kg/m³ for fresh ice |
IceThickM | Mean ice thickness (m) |
IceVelM | Mean ice drift velocity (m/s) |
Pf | Ice failure pressure (Pa). Highly site-specific — values from 0.5–5 MPa are used in practice |
General
Section titled “General”| Setting | Description |
|---|---|
| Echo | Write a copy of the input file to the console log for verification |
IceSumFile | Output summary file name (icedyn.sum) |
Loading an IceDyn file
Section titled “Loading an IceDyn file”IceDyn requires a separate .dat input file. Click Open .dat in the panel header to browse to the file. Since IceDyn is rarely used, no bundled template is provided — configure the parameters in the panel and save to a new file location.
Official documentation
Section titled “Official documentation”For a full description of all IceDyn parameters, see the OpenFAST IceDyn User’s Guide.