uiui2022 / raft

A frequency-domain dynamics model for floating wind turbines

RAFT - Response Amplitudes of Floating Turbines

RAFT is a Python code for frequency-domain analysis of floating wind turbines. It constitutes the "Level 1" of modeling fidelity in the WEIS toolset for floating wind turbine controls co-design. RAFT provides frequency-domain modeling of full floating wind turbine systems including turbine aerodynamics, controls, rigid-body platform hydrodynamics, and mooring response. The rotor aerodynamics are provided by CCBlade and the mooring system is represented by NREL's new quasi-static mooring system model, MoorPy. Potential-flow hydrodynamics can optionally be used via pyHAMS, a Python wrapper of the HAMS (Hydrodynamic Analysis of Marine Structures) tool for boundary-element-method solution of the potential flow problem developed by Yingyi Liu.

RAFT v1.0.0 includes the capabilities described above, and further development is planned to expand these capabilities. Documentation and verification efforts are ongoing. Please see RAFT's documentation for more information.

Getting Started

New users of RAFT as a standalone model are recommended to begin by looking at the input file and script provided in the examples folder, and seeking further information from the RAFT documentation. For use as part of the WEIS toolset, information will be provided once this capability is completed in the WEIS documentation.

Prerequisites

• Python 3
• NumPy
• Matplotlib
• SciPy
• YAML
• MoorPy (available at https://github.com/NREL/MoorPy)
• pyHams (available at https://github.com/WISDEM/pyHAMS)
• CCBlade and WISDEM* (available at https://github.com/WISDEM/WISDEM)

* RAFT uses CCBlade and currently requires additional related functions from the larger WISDEM code. We recommend installing WISDEM for the time being.

Installation

Download/clone and install this RAFT repository as well as that of MoorPy, pyHAMS, and WISDEM. To install RAFT in development mode, go to its directory and run python setup.py develop or pip install -e . from the command line.

Documentation and Issues

Please see https://weis.readthedocs.io/en/latest/ for documentation.

Questions and issues can be posted at https://github.com/WISDEM/RAFT/issues.

License

RAFT is licensed under the Apache License, Version 2.0