DeRisk – De-risking of ULS wave loads
The foundation for wind turbines at sea needs to withstand occational extreme waves. Extreme waves are a well known phenomenon, however the exact stress they put on under water foundations are not well understood. DeRisk seeks to change this.
Project description
DeRisk - de-risking of ULS wave loads leads to a lowered cost of energy for offshore wind energy through an improved design procedure for extreme wave loads. The wind turbine foundations typically make out 20% of the Cost of Energy and the extreme ULS waves (ULS, Ultimate Limit State) are often dimensioning. The existing design procedure is based on models developed for deep-water oil and gas applications. For the shallower depths of offshore wind farms, the extreme waves are strongly nonlinear and the simple engineering models are associated with uncertainties that impose large safety margins and increased risk. For this reason there is a huge cost reduction potential associated with the development and application of methods with improved accuracy. DeRisk unlocks this potential through an integrated evaluation of the design chain from measured met-ocean data, over the critical combination of wind-, wave and current parameters to the detailed structural load calculation. A series of numerical models for wave transformation and load calculation are developed and applied to quantification of advanced load effects such as 3D directional spreading, sea bed slope and wave-current interaction. The results are validated against new laboratory measurements for steep and breaking waves on currents and are condensed into a new de-risked design method. The Danish research is supplemented by research at University of Oxford and Stavanger University, who both holds leading expertise in offshore design. Application of the results are secured through participation of DONG, Statkraft and DHI; network activities with the industry and an Advisory Board with participation of DNV, DONG, Statkraft, Vestas and Rambøll.
Key figures
Period:
2015 - 2019
Funding year:
2014
Own financial contribution:
4.23 mio. DKK
Grant:
20.17 mio. DKK
Funding rate:
81 %
Project budget:
24.87 mio. DKK
Participants
Danmarks Tekniske Universitet (DTU) (Main Responsible)
Partners and economy
| Partner | Subsidy | Auto financing |
|---|---|---|
| Danmarks Tekniske Universitet (DTU) | 15,01 mio. DKK | 3,09 mio. DKK |
| DHI | 3,55 mio. DKK | 0,11 mio. DKK |
| Ørsted A/S | 0,30 mio. DKK | 0,30 mio. DKK |
| University of Oxford | 651,38 mio. DKK | 0,21 mio. DKK |
| Universitetet i Stavanger | 0,52 mio. DKK | 0,40 mio. DKK |
| Statkraft | 0,13 mio. DKK | 0,13 mio. DKK |
Contact
Kontakperson
Henrik Bredmose
Comtact information
Danmarks Tekniske Universitet
Nils Koppels Alle
Bygning 403, rum 214
2800 Kgs. Lyngby
Contact email
hbre@dtu.dk
