Welcome to the working repo for a dynamic parametric wake toolbox that combines and connects OnWaRDS, FLORIDyn, and FLORIS (OFF).
The OFF toolbox is meant to provide one interface to dynamic parametric wake modeling. The goal is to enable testing of different approaches, comparisons using the same interface, and an environment to develop new approaches.
So what can you expect today? The toolbox allows you to run dynamic wind farm simulations using a prescribed (uniform) flow field. The code uses an implementation of the FLORIDyn-framework [1], which then interfaces to the FLORISv4 model [2].
Current degrees of design-freedom include:
- The flow field can change uniformly in direction and speed,
- within FLORISv4 different wake models can be selected,
- the number and location of turbines can be altered,
- Wake steering control is available
Current limitations include:
- Heterogeneous flow field behavior is not included,
- The dynamic solver is a preliminary implementation, and cannot be changed
- OnWaRDS [3] approach not yet implemented
- Particle model and behavior not yet changeable
Features include:
- Logging
- There is an auto-documentation framework
- UML diagram of the code
- Measurements are stored in run-folders
- Preliminary effective wind speed flow field plots are possible
- Features
- Implement a low-level controller for induction control
- Reference cases
- Floating wind turbines
- Reference optimization workflow
- Connect to other steady-state wake solvers (e.g., PyWake)
- Implement OnWaRDS approach
- Computational performance
- Input flow field data (heterogeneous flow)
- User-friendliness
- Code refactoring for a better overview
- Improved flow field plotting
- Complete the "Interactive Simulation Assembly"
- Communicate back what model has been used and under which conditions (Report)
FLORIDyn and OnWaRDS are hopefully only the start of creating a transparent toolbox to explore dynamic parametric wake modeling choices. We therefore plan to implement more model-design decisions and allow a simple, automatable change of them.
Fork branch commit push pull! We do explicitly encourage the interested developers to engage and also to add their ideas and code to the toolbox. The Git is also meant as a place to discuss and propose new changes.
Run the main.py in the 03_Code folder.
To change the simulation, you have to change the .yaml file OFF calls. This is defined by one of the first limes of code in the main function. The .yaml structure is showed in 02_Examples_and_Cases/02_Example_Cases/run_example.yaml . This is where you can change the wind farm layout, the flow conditions, the wake model etc.
A thorough description of the code is available here. The documentation is handled automatically using Sphinx.
If OFF has played a role in your work, please cite the following publication:
@Article{wes-10-1055-2025,
AUTHOR = {Becker, M. and Lejeune, M. and Chatelain, P. and Allaerts, D. and Mudafort, R. and van Wingerden, J.-W.},
TITLE = {A dynamic open-source model to investigate wake dynamics in response to wind farm flow control strategies},
JOURNAL = {Wind Energy Science},
VOLUME = {10},
YEAR = {2025},
NUMBER = {6},
PAGES = {1055--1075},
URL = {https://wes.copernicus.org/articles/10/1055/2025/},
DOI = {10.5194/wes-10-1055-2025}
}
Marcus Becker (TU Delft) and Maxime Lejeune (UCLouvain/VKI) are the core developers of the OFF toolbox. Leendert Starink (TU Delft) is working on a floating turbine implementation.
[1] FLORIDyn - A dynamic and flexible framework for real-time wind farm control, M. Becker, D. Allaerts, J.W. van Wingerden, 2022 J. Phys.: Conf. Ser. 2265(2022) 032103
[2] FLORIS Wake Modeling and Wind Farm Controls Software, National Renewable Energy Laboratory, 2024, GitHub
[3] A Meandering-Capturing Wake Model Coupled to Rotor-Based Flow-Sensing for Operational Wind Farm Flow Prediction, M. Lejeune, M. Moens, P. Chatelain, 2022 Front. Energy Res., Sec. Wind Energy