Explanipedia

Numerical investigation of vortex-induced forces on a wind turbine tower segment at very high Reynolds numbers Open

K Ebstrup, Niels N. Sørensen, Franck Bertagnolio, Christian Grinderslev, Sergio González Horcas · 2024

The vortex-induced forces on an extruded cylinder with a span of two diameters representative of a finite segment of a non-tapered wind turbine tower at a very high Reynolds number (Re = 8.0×10 6 ) are numerically investigated using an inc…

Assessment of Road Traffic Noise in a Danish City using Mobile Monitoring and Statistical Modelling Approaches Open

Jibran Khan, Franck Bertagnolio · 2024

This research work assesses road traffic noise in the Danish city of Roskilde via mobile monitoring. A bicycle measurements campaign using portable sensors was conducted during September - October 2020. Results of the measurements showed a…

Sound-Propagation-Models in Wind-Energy: A Code2Code-Comparison Open

Katharina Elsen, Franck Bertagnolio, Arthur Schady · 2024

Within the framework of IEA wind Task 39 different benchmark-tests are performed. Here we are presenting a comparison of a particle-based model, a wave-based model and a PE-model with respect to two different test cases. They are of theore…

Wind Turbine Noise Code Benchmark: A Comparison and Verification Exercise: Preprint Open

Franck Bertagnolio, Andreas Fischer, Christina Appel, Michaela Herr, Ferdinand Seel , et al. · 2023

In a number of institutions and companies, researchers and engineers are developing modeling numerical frameworks that are used to predict the aerodynamic noise emission from a wind turbine rotor. The simulation codes vary from empirically…

A roadmap for required technological advancements to further reduce onshore wind turbine noise impact on the environment Open

Franck Bertagnolio, Michaela Herr, Kaj Dam Madsen · 2023

The noise emission of wind turbines and farms can be an important and limiting factor for future cost reductions and growth of wind energy. Closing scientific and technological gaps on wind turbine noise is thus directly supporting the fur…

DECOWIND DEVELOPMENT OF LOW-NOISE AND COST-EFFECTIVE WIND FARM CONTROL TECHNOLOGY Open

Franck Bertagnolio, Thomas W. Hansen, L S Søndergaard, Thorkild I. A. Sørensen, Andreas Fischer , et al. · 2022

Propagation of wind turbine noise: measurements and model evaluation Open

Camilla Marie Nyborg, Andreas Fischer, E Thysell, Feng Ju, L S Søndergaard , et al. · 2022

Sound propagation from wind turbines through the atmosphere has previously been analytically examined through numerous studies, but the amount of comparisons to measurements is limited. This paper applies three different sound propagation …

Validation Efforts of an Open-Source Aeroacoustics Model for Wind Turbines: Preprint Open

Pietro Bortolotti, Yi Guo, Eric Simley, Jason Roadman, Nicholas Hamilton , et al. · 2021

The open source aeroservoelastic wind turbine solver, OpenFAST, now includes an aeroacoustics model, which is described here and validated against experimental measurements recorded on a GE 1.5-MW wind turbine installed at the Flatirons Ca…

Turbulent boundary layer trailing-edge noise: Theory, computation, experiment, and application Open

Seongkyu Lee, Lorna J. Ayton, Franck Bertagnolio, Stéphane Moreau, Tze Pei Chong , et al. · 2021

When the pressure fluctuations caused by turbulence vorticity in the boundary layer are scattered by a sharp trailing edge, acoustic energy is generated and propagated to the far field. This trailing edge noise is emitted from aircraft win…

IEA Wind TCP Task 29, Phase IV: Detailed Aerodynamics of Wind Turbines Open

J.G. Schepers, Koen Boorsma, H.A Madsen, Georg Raimund Pirrung, Galih Bangga , et al. · 2021

This report describes the results of the fourth phase of IEA TCP Wind Task 29 on wind turbine aerodynamics.

Analysis of noise emission from a single wind turbine at large distances Open

Franck Bertagnolio, Andrea Fischer, Wen Zhong Shen, Andrea Vignaroli, Kurt Schaldemose Hansen , et al. · 2020

International audience

Validation of noise propagation models against detailed flow and acoustic measurements Open

Wen Zhong Shen, Matias Sessarego, Jiufa Cao, Camilla Marie Nyborg, Kurt Schaldemose Hansen , et al. · 2020

In this paper, four noise propagation models including the parabolic-equation based WindSTAR model, ray-tracing based Nord2000 model, Danish regulation BEK 135 model and ISO 9613-2 standard model are validated against flow and acoustic mea…

Analysis of log-amplitude saturation of noise emission from a loudspeaker on a wind turbine nacelle Open

Franck Bertagnolio, Andreas Fischer, Wen Zhong Shen, Andrea Vignaroli, Kurt Schaldemose Hansen , et al. · 2020

This work is concerned with the analysis of log-amplitude fluctuations, and their saturation at large distances, using loudspeaker broadband noise emissions. An experiment is conducted outdoor with a loudspeaker on a wind turbine nacelle a…

Analysis of Low-Frequency Noise from Wind Turbines using a Temporal Noise Code Open

Franck Bertagnolio, Helge Aagaard Madsen, Andreas Fischer · 2019

This study is concerned with the modelling of low-frequency noise from wind turbines and the comparison of model predictions with experimental data. The model consists of a wind turbine aeroelastic code that can account for the effects of …

Noise emission from wind turbines in wake - Measurement and modeling Open

Franck Bertagnolio, Helge Aagaard Madsen, Andreas Fischer · 2018

The influence of the wake of an upstream turbine impinging another one located further downstream is studied focusing on the latter’s noise emission. Measurement data are investigated in the form of surface pressure fluctuations acquired u…

Aerodynamic effects of compressibility for wind turbines at high tip speeds Open

Niels N. Sørensen, Franck Bertagnolio, Eva Jost, Thorsten Lutz · 2018

In the present work two dimensional airfoil computations are used to investigate the effects of compressibility in the tip region of large scale wind turbines of 20 MW+ size. In the past application of incompressible CFD solvers have been …

Wind Turbine Acoustic Day 2018 - Summary of the 3rd edition Open

Jesper Mogensen, Bo Søndergaard, Sabine von Hünerbein, Lars Sommer Søndergaard, Tomas R. Hansen , et al. · 2018

The bi-annual event entitled Wind Turbine Acoustic Day dealing with wind turbine noise issues organized by DTU Wind Energy took place on May, 17th 2018 as its third edition. The abstracts and slides for the presentations are reported.

Cross-Cutting Activities 2016 on Wind Turbine Noise, Summary Report Open

Franck Bertagnolio, Helge Aagaard Madsen, Andreas Fischer, Mark Kelly, Wen Zhong Shen , et al. · 2017

The goal of this report is to summarize activities that took place in year 2016 as part of the Cross-Cutting Activity on Wind Turbine Noise, self-financed by DTU Wind Energy. A short description of the background behind this project (in pa…

Noise model for serrated trailing edges compared to wind tunnel measurements Open

Andreas Fischer, Franck Bertagnolio, Wen Zhong Shen, Jesper Madsen · 2016

A new CFD RANS based method to predict the far field sound pressure emitted from an aerofoil with serrated trailing edge has been developed. The model was validated by comparison to measurements conducted in the Virginia Tech Stability Win…

In search for a canonical design ABL stability class for wind farm turbines Open

Gunner Chr. Larsen, David Robert Verelst, Franck Bertagnolio, Søren Ott, A. Chougule · 2016

Production as well as loading of wake exposed wind turbines is known to depend significantly on stability of the Atmospheric Boundary Layer (ABL), which adds a new dimension to design of wind farm turbines. Adding this new aspect in wind t…

A novel full scale experimental characterization of wind turbine aero-acoustic noise sources - preliminary results Open

Helge Aagaard Madsen, Franck Bertagnolio, Andreas Fischer, Christian Bak, Uwe Schmidt Paulsen · 2016

International audience

Validation of an Aero-Acoustic Wind Turbine Noise Model Using Advanced Noise Source Measurements of a 500kW Turbine Open

Franck Bertagnolio, Helge Aagaard Madsen, Andreas Fischer, Christian Bak · 2016

The measurement of a 500 kW stall-regulated wind turbine is investigated. Microphones located relatively close to the wind turbine are used to measure its acoustic emission. The operational conditions of the turbine, such as wind speed, ar…

Impact of atmospheric stability conditions on wind farm loading and production Open

Gunner Chr. Larsen, Søren Ott, Niels Troldborg, A. Chougule, Jakob Mann , et al. · 2016

The project has created a new basis for further development and optimization of WT’s designed for WF operation. This has been accomplished through developing of more realistic modelling of WF flow fields as well as of such fields interacti…

Improvement of TNO type trailing edge noise models Open

Andreas Fischer, Franck Bertagnolio, Helge Aagaard Madsen · 2016

The paper describes an improvement of the so-called TNO model to predict the noise emission from aerofoil sections due to the interaction of the boundary layer turbulence with the trailing edge. The surface pressure field close to the trai…

Basic Principles and Evidences of Wind Turbine Noise Generation Mechanisms Open

Franck Bertagnolio, Helge Aagaard Madsen, Andreas Fischer, Christian Bak · 2015

Experimental Characterization of Stall NoiseToward its Modelling Open

Franck Bertagnolio, Helge Aagaard Madsen, Andreas Fischer, Christian Bak · 2015

Wind tunnel measurements of three different airfoils are investigated using surface pressure microphones flush-mounted on the suction side of the airfoils. In stalled conditions, these microphones can be used to evaluate the convection vel…

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