HydroDyn

The HydroDyn panel configures hydrodynamic loads for offshore turbine simulations. Click HydroDyn under MODULES in the sidebar to open it. HydroDyn is only active when the project model includes an offshore substructure.

What this panel controls

HydroDyn computes wave and current loads on the substructure using Morison’s equation and/or a potential-flow diffraction model. The panel exposes the wave environment settings:

Setting	Description
Wave model	No waves (0), irregular JONSWAP (2), or user-defined spectrum (5)
Significant wave height (Hs)	Characteristic wave height in metres
Peak spectral period (Tp)	Wave peak period in seconds
Wave direction	Predominant wave propagation direction relative to turbine X axis (°)
Current model	No current (0), sub-surface (1), or near-surface (2) current profile
Water depth	Site water depth in metres

For land-based turbines, HydroDyn should be disabled in the .fst file (CompHydro = 0). FlowUrja Studio does this automatically when the active model is a land-based configuration.

Official documentation

For a full description of all HydroDyn parameters, see the OpenFAST HydroDyn User’s Guide.