Advanced computational fluid dynamics (CFD)–multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines

Klein, Levin; Gude, Jonas; Wenz, Florian; Lutz, Thorsten; Krämer, Ewald

doi:10.5194/wes-3-713-2018

Cited by 34 publications

(42 citation statements)

References 28 publications

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“…In Sect. 2 of this paper, the high-fidelity framework (as presented in Klein et al, 2018) is described for fluid-structure interaction coupled simula-tions on the NM80 2 MW wind turbine rotor, also known as the DANAERO rotor (DANAERO project, 2020). The inflow conditions and setup for the different cases are described.…”

Section: Introductionmentioning

confidence: 99%

Aeroelastic analysis of wind turbines under turbulent inflow conditions

et al. 2021

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Abstract. The aeroelastic response of a 2 MW NM80 turbine with a rotor diameter of 80 m and interaction phenomena are investigated by the use of a high-fidelity model. A time-accurate unsteady fluid–structure interaction (FSI) coupling is used between a computational fluid dynamics (CFD) code for the aerodynamic response and a multi-body simulation (MBS) code for the structural response. Different CFD models of the same turbine with increasing complexity and technical details are coupled to the same MBS model in order to identify the impact of the different modeling approaches. The influence of the blade and tower flexibility and of the inflow turbulence is analyzed starting from a specific case of the DANAERO experiment, where a comparison with experimental data is given. A wider range of uniform inflow velocities are investigated by the use of a blade element momentum (BEM) aerodynamic model. Lastly a fatigue analysis is performed from load signals in order to identify the most damaging load cycles and the fatigue ratio between the different models, showing that a highly turbulent inflow has a larger impact than flexibility, when low inflow velocities are considered. The results without the injection of turbulence are also discussed and compared to the ones provided by the BEM code AeroDyn.

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Section: Introductionmentioning

confidence: 99%

Aeroelastic analysis of wind turbines under turbulent inflow conditions

et al. 2021

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“…While the majority of research dedicated to wind turbine acoustics aims to understand the aerodynamic sound coming from the interaction of turbulent inflow and wind turbine blades, lesser work is carried out regarding tonal sound that is excited in the turbines drive train [10][11][12][13][14]. Advances in the field of broadband aerodynamic sound reveals the need to address tonal emission in the future.…”

Section: Motivationmentioning

confidence: 99%

Calculation of structure-borne sound in a direct drive wind turbine

Cardaun

Schelenz

Jacobs

et al. 2021

Forsch Ingenieurwes

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In this publication, the methods will be presented that are deployed to formulate a multi-physical system model of a direct drive wind turbine in order to calculate structure borne sound. The model includes excitation effect as well as sound radiating behaviour. The mechanical structure as a medium partner between excitation and radiation will be formulated through a multi-body simulation model in the time domain. In the multi-body simulation model, all relevant drivetrain components are considered with their structural eigenmodes in the frequency range of interest. The electromagnetic forces of the multi-pole ring generator are calculated and introduced into the mechanical structure at each stator tooth, rotor pole and various axial positions individually. Similarly, the modelling of the bearings is investigated for a range of available methods. Sound emission is evaluated at the large outer surface structures like tower, blades and nacelle cover. To minimize computational effort, the surface accelerations are not calculated for each surface node, instead a modal approach is used. Through a combination of mode shapes with mode participation factors of the respective structures, the surface accelerations can be regained during a post-processing step. Those results are used as input for airborne sound calculations. Nevertheless, the high number of modal and spatial degrees of freedom results in high computing costs.

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“…These can be compared with sound power levels from other turbine noise sources to determine the relative importance of trailing-edge noise in various frequency bands and receiver distances. Work is also on-going on the development of a computer model for assessing LFN emission from the turbine rotor blades [48].…”

Section: Calculation (Including Amplitude Modulation)mentioning

confidence: 99%

Recent Advances in Wind Turbine Noise Research

Hansen

2020

Acoustics

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This review is focussed on large-scale, horizontal-axis upwind turbines. Vertical-axis turbines are not considered here as they are not sufficiently efficient to be deployed in the commercial generation of electricity. Recent developments in horizontal-axis wind turbine noise research are summarised and topics that are pertinent to the problem, but are yet to be investigated, are explored and suggestions for future research are offered. The major portion of recent and current research on wind turbine noise generation, propagation and its effects on people and animals is being undertaken by groups in Europe, UK, USA, Japan, Australia and New Zealand. Considerable progress has been made in understanding wind turbine noise generation and propagation as well as the effect of wind farm noise on people, birds and animals. However, much remains to be done to answer many of the questions for which answers are still uncertain. In addition to community concerns about the effect of wind farm noise on people and how best to regulate wind farm noise and check installed wind farms for compliance, there is considerable interest from turbine manufacturers in developing quieter rotors, with the intention of allowing wind farm installations to be closer to populated areas. The purpose of this paper is to summarise recent and current wind farm noise research work and the research questions that remain to be addressed or are in the process of being addressed. Topics that are the subject of on-going research are discussed briefly and references to recent and current work are included.

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Advanced computational fluid dynamics (CFD)–multi-body simulation (MBS) coupling to assess low-frequency emissions from wind turbines

Cited by 34 publications

References 28 publications

Aeroelastic analysis of wind turbines under turbulent inflow conditions

Aeroelastic analysis of wind turbines under turbulent inflow conditions

Calculation of structure-borne sound in a direct drive wind turbine

Recent Advances in Wind Turbine Noise Research

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