A5041156289- Wind Energy Research and Development
- Fluid Dynamics and Vibration Analysis
- Wind and Air Flow Studies
- Wave and Wind Energy Systems
- Vibration and Dynamic Analysis
- Structural Health Monitoring Techniques
- Cavitation Phenomena in Pumps
- Wind Turbine Control Systems
- Coastal and Marine Dynamics
- Geotechnical Engineering and Underground Structures
- Water Systems and Optimization
- Aerodynamics and Fluid Dynamics Research
- Electric Motor Design and Analysis
- Fluid Dynamics Simulations and Interactions
- Icing and De-icing Technologies
- Magnetic Bearings and Levitation Dynamics
- Hydraulic and Pneumatic Systems
- Computational Fluid Dynamics and Aerodynamics
- Offshore Engineering and Technologies
- Ocean Waves and Remote Sensing
- Energy Load and Power Forecasting
- Aerospace Engineering and Energy Systems
- Fluid Dynamics and Turbulent Flows
- Gear and Bearing Dynamics Analysis
- Aeolian processes and effects
Technical University of Denmark
2011-2020
Vestas (Denmark)
2019-2020
Wind Power Engineering (Japan)
2018
Danish Energy Association
2018
Aalborg University
1994-2015
Danmarks Nationalbank
2015
Centre for Sustainable Energy
2001-2011
Nordisk Fond for Miljø og Udvikling
2004-2008
United States Department of Energy
2003-2007
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering
1987-1999
Abstract The phenomenon of wake meandering is long known empirically, but has so far not been treated in a satisfactory manner on the wind turbine load modelling side. We present consistent, physically based theory for meandering, which we consider crucial importance overall description loadings farms. In its version, model confined to single situations—including simple heuristic interaction with reflecting surface. Contrary previous attempts loading, approach opens unifying sense that power...
Wind turbines mounted on floating platforms is subjected to completely different and soft foundation properties, than seen for onshore wind turbines. This leads much lower natural frequencies, related the rigid body motion of structure which again an unfavorable coupling between tower pitch control turbine. The in combination with aerodynamics will be poor or even negative damped causes large transient loads if not accounted for. reason this low damping shown caused by a too fast regulation...
Abstract. We show that the upscaling of wind turbines from rotor diameters 15–20 m to presently large rotors 150–200 has changed requirements for aerodynamic blade element momentum (BEM) models in aeroelastic codes. This is because typical scales inflow turbulence are now comparable with diameter turbines. Therefore, spectrum incoming relative rotating increased energy content on 1P, 2P, …, nP, and annular mean induction approach a classical BEM implementation might no longer be good...
ABSTRACT This paper investigates wake effects on load and power production by using the dynamic meander (DWM) model implemented in aeroelastic code HAWC2. The instationary wind farm flow characteristics are modeled treating turbine wakes as passive tracers transported downstream a meandering process driven low frequent cross‐wind turbulence components. complex is validated comparing simulated measured loads for Dutch Egmond aan Zee consisting of 36 Vestas V90 located outside coast...
As the major part of new wind turbines are installed in clusters or farms, there is a strong need for reliable and accurate tools predicting increased loadings due to wake operation associated reduced power production. The dynamic meandering (DWM) model has been developed on this background, basic physical mechanisms wake—i.e., velocity deficit, added turbulence—are modeled as simply possible order make fast computations. In present paper, DWM presented version suitable full integration an...
A wind farm layout optimization framework based on a multi-fidelity approach is applied to the offshore test case of Middelgrunden, Denmark as well onshore Stag Holt – Coldham farm, UK. While aesthetic considerations have heavily influenced famous curved design Middelgrunden this work focuses demonstrating method that optimizes profit farms over their lifetime balance energy production income, electrical grid costs, foundations cost, and cost wake turbulence induced fatigue degradation...
Offshore wind turbines are designed and analyzed using comprehensive simulation tools (or codes) that account for the coupled dynamics of inflow, aerodynamics, elasticity, controls turbine, along with incident waves, sea current, hydrodynamics, mooring dynamics, foundation support structure. This paper describes latest findings code-to-code verification activities Code Comparison Collaboration Continuation project, which operates under International Energy Agency Wind Task 30. In phase...
Abstract A new load‐reducing control strategy for individual blade of large pitch‐controlled wind turbines is presented. This concept based on local inflow measurements and offers the possibility larger load reductions, without loss power production, than seen in other state‐of‐the‐art concepts. Since flow‐based deviates significantly from previous published strategies, a comparison performance aeroelastic simulations included. Advantages drawbacks systems are discussed. Copyright © 2004...
ABSTRACT There seems to be a significant uncertainty in aerodynamic and aeroelastic simulations on megawatt turbines operating inflow with considerable shear, particular the engineering blade element momentum (BEM) model, commonly implemented design codes used by industry. Computations advanced vortex computational fluid dynamics models are provide improved insight into complex flow phenomena rotor aerodynamics caused sheared inflow. One consistent result from is variation of induced...
This paper introduces the work content and status of first international investigation verification aero-elastic codes for offshore wind turbines as performed by "Offshore Code Comparison Collaboration"(OC3) within "IEA Wind Annex XXIII - Subtask 2". An overview is given on state-of-the-art concerned turbine simulation codes. Exemplary results benchmark simulations from phase project are presented discussed while subsequent phases introduced. Furthermore, discusses areas where differences...
ABSTRACT This work presents the results of a benchmark study on aero‐servo‐hydro‐elastic codes for offshore wind turbine dynamic simulation. The verified herein account coupled systems including inflow, aerodynamics, elasticity and controls turbine, along with incident waves, sea current, hydrodynamics foundation dynamics support structure. A large set time series simulation such as operational characteristics, external conditions, load displacement outputs was compared interpreted. Load...
The paper presents the implementation of Actuator Cylinder (AC) flow model in HAWC2 aeroelastic code originally developed for simulation Horizontal Axis Wind Turbine (HAWT) aeroelasticity. This is done within DeepWind project where main objective to explore competitiveness VAWTs floating MW concepts. AC a 2D and has thus some advantages compared with stream tube models often used VAWT aerodynamic models. A major finding presented present simple way correct results from linear version so that...
In the 18th Century, British Empiricism founded modern empirical science to overcome human prejudices by religion, tradition and personality. Pragmatic Humanism supports personal responsibility 10 positivist guidelines serving unfold our potential: • Applied Neuroeconomic Psychology (NeP) Guides Individual Economic Behavior: (1) Sensitivity training, (2) Entrepreneurship (3) Stress management. (4) Prevention of subjective biases in behavioral science. (5) Mutual understanding between...
Loads from extreme waves can be dimensioning for the substructures of offshore wind turbines. The DeRisk project (2015-2019) aims at an improved load evaluation procedure through application advanced wave models, laboratory tests effects, development hydrodynamic aero-elastic response calculations and statistical analysis. This first paper outlines content philosophy behind DeRisk. Next, results with irregular are presented, including 2D 3D focused groups. group a 6-hour (full scale...
Abstract Aeroelasticity is a key issue in the continuing development of wind turbines towards large, flexible, highly optimized machines. The steadily increasing technology level reflected not necessarily by complexity turbines, but knowledge and advanced principles that are taken into account during design process incorporated final design. This article examines some main uncertainties within aeroelastic modelling have been hard to resolve over years research, also presents perspectives for...
The paper studies the applicability of IEC 61400-1 ed.3, 2005 International Standard wind turbine minimum design requirements in case an onshore Darrieus VAWT and compares results basic Design Load Cases (DLCs) with those a 3-bladed HAWT. study is based on aeroelastic computations using HAWC2 aero-servo-elastic code A 2-bladed 5 MW rotor used modified version DeepWind For HAWT simulations NREL reference model utilized Various DLCs are examined including normal power production, emergency...