Ph.d. forsvar Shaofeng Wang

Supervisorer: Lead Load Specialist Torben Juul Larsen, Vestas Wind Systems - Associate Professor Taeseong Kim, DTU Vindenergi - Professor Henrik Bredmose, DTU Vindenergi

Eksaminator: Professor Mathias Stolpe, DTU Vindenergi - Professor Lars Vabbersgaard Andersen, Aarhus Universitet - Professor Michael Muskulus, Norwegian University of Science and Technology

Titel: Assessment of Offshore Wind Turbines in Extreme Weather Conditions – Wave Nonlinearity Effect, Cyclic Soil Response and Breaking Wave Forcing
DeRisk examines the design chain from met-ocean data to structural response. Joint-probability methods are developed for analysis of met-ocean data. Wave transformation over depth is computed with ground-breaking fully nonlinear, GPU-accelerated wave models. The detailed physical load effects of 3D wave spreading, bed-slope, wave-current interaction and formation of extreme irregular waves are quantified experimentally. Specialised tools for high-frequency ringing-type and breaking wave loads are developed. Advanced LES-based CFD methods are developed and applied to extreme wave impacts with wall friction. 

The structural response for wind turbine structures of mono-pod and jacket type are examined through aero-elastic calculations and analysis of lab and field data. For the first time, new methods for numerical uncertainty quantification are applied to quantify the model sensitivity. The new tools and detailed investigations are sythesized into a de-risked design procedure for ULS wave loads. 

This work package examines the response of the full wind turbine structure subject to simultaneous wind and wave forcing. Hereby, increased insight into the critical load cases is achieved. Comparison of response to field data and laboratory data for jacket structures is made and used for model validation.

Tidspunkt

fre 29 mar 19
13:00 - 16:00

Arrangør

Hvor

DTU Wind Energy
DTU Risø Campus
Frederiksborgvej 399, bld. 112, H. H. Koch
4000 Roskilde