Modelling of wake dynamics and instabilities of a floating horizontal-axis wind turbine under surge motion

Guang, Chen; Liang, Xifeng; Li, Xiaobai

doi:10.1016/j.energy.2021.122110

Cited by 47 publications

(25 citation statements)

References 36 publications

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“…Dynamic mesh technology has a slow self-checking speed of grid reconstruction in the later stages of calculation. Conversely, overset mesh technology has an excellent performance in mesh coupling and is widely used in the simulation of aerodynamic characteristics of high-speed trains and wind turbines (Chen et al 2021b(Chen et al , 2021a(Chen et al , 2022Liu et al 2020). In this study, the overset mesh technology was adopted to simulate the relative movement between the train and tunnel.…”

Section: Computational Mesh and Monitoring Pointsmentioning

confidence: 99%

Numerical Analysis of the Effect of Streamlined Nose Length on Slipstream of High-Speed Train Passing through a Tunnel

2022

JAFM

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The improved delayed detached eddy simulation (IDDES) method was employed based on the shear-stress transport (SST) - two-equation turbulence model to simulate the slipstream distribution characteristics of a high-speed train traversing a tunnel. The accuracy of the numerical simulation method was verified through a full-scale test. First, the wake vortex structure and the distribution of slipstreams of the train with a streamlined nose length of 7 m running in a tunnel were analyzed. Then, the influence of the streamlined nose length on the wake dynamics and slipstream was compared and analyzed. The slipstream positive peak decreased with increasing distance from the top of the rail and center of the track. As the streamlined nose length increases, the vortex intensity in the wake area weakens; moreover, the influence ranges of the wake vortex and the slipstream positive peak value become smaller. Compared with the results of a train having a streamlined nose length of 5 m, the slipstream positive peak value at 1.4 m from the top of the rail and 100 m from the tunnel entrance decreased by 46.6% from that of a train with a streamlined nose length of 9 m.

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Section: Computational Mesh and Monitoring Pointsmentioning

confidence: 99%

Numerical Analysis of the Effect of Streamlined Nose Length on Slipstream of High-Speed Train Passing through a Tunnel

2022

JAFM

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“…In the case of floating wind turbines, the wind turbine motion that results from the interaction of the floating structure with the wind and sea has to be considered, in addition to the atmospheric conditions. The wake characteristics of floating wind turbines have been studied using numerical (Wise and Bachynski, 2020;Kleine et al, 2021;Nanos et al, 2021;Chen et al, 2022;Li et al, 2022) and wind tunnel (Fu et al, 2019;Schliffke et al, 2020) experiments. Those studies focussed on the impact of the sway (Fu et al, 2019;Nanos et al, 2021;Li et al, 2022), surge (Fu et al, 2019;Schliffke et al, 2020;Chen et al, 2022) and heave (Kleine et al, 2021) motions on the turbine operation.…”

Section: Introductionmentioning

confidence: 99%

“…The wake characteristics of floating wind turbines have been studied using numerical (Wise and Bachynski, 2020;Kleine et al, 2021;Nanos et al, 2021;Chen et al, 2022;Li et al, 2022) and wind tunnel (Fu et al, 2019;Schliffke et al, 2020) experiments. Those studies focussed on the impact of the sway (Fu et al, 2019;Nanos et al, 2021;Li et al, 2022), surge (Fu et al, 2019;Schliffke et al, 2020;Chen et al, 2022) and heave (Kleine et al, 2021) motions on the turbine operation. Yet, the absence of the study of the motion of floating turbine under realistic atmospheric turbulence conditions limits our understanding on how the impact of the motion of the wind turbine on the wake properties can be utilized in control strategies that optimize the operation of wind turbines and subsequently wind farms.…”

Section: Introductionmentioning

confidence: 99%

Revealing inflow and wake conditions of a 6MW floating turbine

Angelou

Mann

Dubreuil-Boisclair

2023

Preprint

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Abstract. We investigate the characteristics of the inflow and the wake of a 6MW floating wind turbine from the Hywind Scotland offshore wind farm, the world's first floating wind farm. We use two commercial nacelle-mounted lidars to measure the up- and downwind conditions, with a fixed and a scanning measuring geometry, respectively. In the analysis, the effect of the surge and sway motion of the nacelle on the lidar measuring location is taken into account. The upwind conditions are parameterised in terms of the mean horizontal wind vector at hub height, the shear and veer of the wind profile along the upper part of the rotor and the induction of the wind turbine rotor. The wake characteristics are studied in two narrow wind speed intervals 8.5–9.5 ms-1 and 12.5–13.5 ms-1, corresponding to below and above rotor rated speeds, respectively, and for turbulence intensity values between 3.3 %–6.4 %. The wake flow is measured by a wind lidar scanning in a horizontal plan position indicator mode, which reaches ten rotor diameters downwind. This study focuses on the downstream area between 3 and 8 rotor diameters. In this region, our observations show that the transverse profile of the wake can be adequately described by a self-similar wind speed deficit, that follows a Gaussian distribution. We find that even small variations (∼1 %–2 %) of the ambient turbulence intensity can result in an up to 10 % faster wake recovery. Furthermore, we do not observe any additional spread of the wake due to the motion of the floating wind turbine.

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“…Computational fluid dynamics (CFD) is an important method to understand the aerodynamic behaviour of HSRTs (Chen et al , 2019; Chen et al , 2021, 2022a, 2022b; Cuhadaroglu, 2009; Dang et al , 2015; Ma et al , 2018b, 2019, 2021; Kulak et al , 2018; Yang et al , 2018). For example, Mohebbi and Rezvani (2018, 2021) used CFD simulation to investigate the aerodynamic performance of trains when running in wind barriers and tried to optimum the porous barrier design considering the running safety of the train (Mohebbi and Safaee, 2022).…”

Section: Introductionmentioning

confidence: 99%

Field test and numerical reconstitution of natural winds at the tunnel entrance section of high-speed railway

Yang

Liu

Deng

et al. 2022

HFF

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Purpose The purpose of this paper is to understand the natural wind field characteristics of the tunnel entrance section and analyzing the aerodynamic performance of high-speed railway trains (HSRTs) under natural winds. Design/methodology/approach Three typical tunnel entrance section sites, namely, tunnel–bridge in a dry canyon (TBDC), tunnel–bridge in a river canyon (TBRC) and tunnel–flat ground (TF), are selected to conduct a continuous wind field measurement. Based on the measured wind characteristics, the natural winds of the TBDC and TF sites are reconstituted and imported into the two corresponding full-scale computational fluid dynamics models. The aerodynamic loads of the HSRT running on TBDC and TF with reconstituted winds are simply analyzed. Findings The von Kármán spectrum can be used to describe the wind field at the tunnel entrance section. In the reconstituted natural wind condition, a time-varying feature of wind speed distribution and leeward side vortex around the HSRT caused by the wind speed fluctuation is found. The fluctuating amplitude of aerodynamic loads at the TBDC infrastructure is up to 97.9% larger than that at the TF infrastructure. Originality/value The natural wind characteristics at tunnel entrance sections on the high-speed railway are first measured and analyzed. A numerical reconstitution scheme considering the temporal and spatial variation of natural wind speed is proposed and verified based on field measurement results. The aerodynamic performance of an HSRT under reconstituted natural winds is first investigated.

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Modelling of wake dynamics and instabilities of a floating horizontal-axis wind turbine under surge motion

Cited by 47 publications

References 36 publications

Numerical Analysis of the Effect of Streamlined Nose Length on Slipstream of High-Speed Train Passing through a Tunnel

Numerical Analysis of the Effect of Streamlined Nose Length on Slipstream of High-Speed Train Passing through a Tunnel

Revealing inflow and wake conditions of a 6MW floating turbine

Field test and numerical reconstitution of natural winds at the tunnel entrance section of high-speed railway

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