Interaction between the Wakes of Large Offshore Wind Farms and Wind Farm Clusters with the Marine Atmospheric Boundary Layer
Offshore wind energy has a central role to play in terms of the energy supply with renewable energies. Given the limited amount of usable space, offshore wind farms are set up in so-called clusters. As a result, wind farms and the individual turbines interact. Wakes with low wind speeds and considerable turbulence develop in the wind shadow downstream of the turbines. The aim of the X-Wakes project is to understand the current and future changes in wind conditions with the ongoing expansion of large scale offshore wind farm developments.
Dr. Martin Dörenkämper (Project Coordination), Dr. Astrid Lampert (Scientific Spokesperson)
Duration of the project:
01.11.2019 – 30.04.2023
Contract number of the project:
Problems/Questions/Key aspects/Aims of the project
- The aim of the X-Wakes project is to investigate changes in wind conditions for the operation of large offshore wind farm clusters.
- In the X-Wakes project data are collected using various measurement methods, including LiDAR, unmanned and manned aircraft and satellites.
- With the help of these data, the project aims to validate advanced tools for the accurate mapping of large wind farm areas in industry models and hi-fidelity wind farm flow and weather models.
- Besides the investigation of the interaction of the wake of several wind farms among each other, the interaction of large scale wakes with the marine atmospheric boundary layer and also coastal effects are studied.
The Federal Government’s plans for the energy revolution in Germany foresees a share of at least 80 percent of the gross electricity consumption being covered by renewable energies by 2050. Offshore wind energy is a fundamental pillar here. However, the space available for wind energy in the German Bight is limited, which is why wind farms are mostly built in clusters. Such clusters can comprise several hundred wind turbines. Wakes with low wind speeds and considerable turbulence develop in the wind shadow behind the turbines. Under certain atmospheric conditions, these wakes can extend for distances in excess of 50 kilometers.
In the framework of X-Wakes wakes and other accumulative effects such as the global blockage effect are investigated to understand how the wind farm clusters influence each other as well as what consequences a large-scale expansion of the offshore wind farm will have on wind conditions in the future. Computer models will be enhanced using the results from this project in order to be able to predict the yields of the wind farms for future expansion scenarios under realistic conditions.
The researchers are employing a combination of complimentary methods. Stationary LiDAR measurements at different locations in the German Bight deliver meteorological data continuously. The extent of the wakes is analyzed on a large scale with the aid of satellite-based remote sensing data. Measuring campaigns with a research aircraft at low altitude also deliver high-resolution meteorological data.
The associated partners of the project provide information for planning the further expansion of the German Bight as well as valuable wind farm production data to ensure that the project objectives are aligned with current and future wind farm operation.
Fraunhofer IWES, Dr. Martin Dörenkämper
TU Braunschweig, Dr. Astrid Lampert
Contacts and Partners
Dr. Martin Dörenkämper (Project Coordination)
+49 441 798 5014
Further Funded Partners:
Karlsruhe Institute for Technology
ForWind – Carl von Ossietzky University Oldenburg
Eberhard Karls University Tübingen
Helmholtz-Zentrum Geesthacht Center for Materials and Coastal Research
UL International GmbH
Federal Maritime and Hydrographic Agency, German Weather Service, EnBW, Merkur Offshore, Nordsee One, Ørsted, RWE Renewables, TenneT, Trianel, Vattenfall
Here you can find interesting presentations about this project in our RAVE International Workshops.
RAVE Workshop 2020: presentation 8
(Only available in German) "Interaktion der Nachläufe großer Offshore-Windparks und Windparkcluster mit der marinen atmosphärischen Grenzschicht" / Dr. Tom Neumann und Dr. Martin Dörenkämper
RAVE Workshop 2021: presentation 8
"Measuring large scale offshore wind farm effects with scanning lidar" / Jörge Schneemann
In addition, you will find further peer-reviewed publications originating from the X-Wakes project under the following links:
Cañadillas, B., Beckenbauer, M., Trujillo, J. J., Dörenkämper, M., Foreman, R., Neumann, T., and Lampert, A.: Offshore wind farm cluster wakes as observed by long-range-scanning wind lidar measurements and mesoscale modeling, Wind Energ. Sci., 7, 1241–1262, https://doi.org/10.5194/wes-7-1241-2022, 2022.
Kemme, L., Strnad, S., Vollmer, L., Schmidt, J., and Lukassen, L.J.: Sensitivity of Wake Modelling Setups, J. Phys.: Conf. Ser. 2265, 022007, https://doi.org/10.1088/1742-6596/2265/2/022007 , 2022.
von Brandis, A., Centurelli, G., Schmidt, J., Vollmer, L., Djath, B., and Dörenkämper, M.: An investigation of mesoscale wind direction changes and their consideration in engineering models, Wind Energ. Sci. Discuss. [preprint], https://doi.org/10.5194/wes-2022-21, accepted for publication, 2023.
Rausch, T., Cañadillas, B., Hampel, O., Simsek, T., Tayfun, Y.B., Neumann, T., Siedersleben, S., Lampert, A.: Wind Lidar and Radiosonde Measurements of Low-Level Jets in Coastal Areas of the German Bight, Atmosphere, 13, 839. https://doi.org/10.3390/atmos13050839, 2022.
Schulz-Stellenfleth, J., Emeis, S., Dörenkämper, M., Bange, J., Cañadillas, B., Neumann, T., Schneemann, J., Weber, I., zum Berge, K., Platis, A., Djath, B., Gottschall, J., Vollmer, L., Rausch, T., Barekzai, M., Hammel, J., Steinfeld, G., Lampert, A.: Coastal impacts on offshore wind farms – a review focussing on the German Bight area, Meteorol. Zeitschrift, 31 (4), 289-315,. https://doi.org/10.1127/metz/2022/1109, 2022.
Centurelli, G., Vollmer, L., Schmidt, J., Dörenkämper, M., Schröder, M., Lukassen, L., and Peinke, J.: Evaluating Global Blockage engineering parametrizations with LES, J. Phys.: Conf. Ser., 1934, 012 021, https://doi.org/10.1088/1742-6596/1934/1/012021 , 2021.
Schneemann, J., Theuer, F., Rott, A., Dörenkämper, M., and Kühn, M.: Offshore wind farm global blockage measured with scanning lidar, Wind Energ. Sci., 6, 521–538, https://doi.org/10.5194/wes-6-521-2021, 2021.