Modeling of horizontal axis wind turbine wakes in Horns Rev offshore wind farm using an improved actuator disc model coupled with computational fluid dynamic

Naderi, Shayan; Parvanehmasiha, Sogand; Torabi, Farschad

doi:10.1016/j.enconman.2018.06.043

Cited by 74 publications

(15 citation statements)

References 38 publications

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“…The inflow conditions at different wind speeds, wind shears, and turbulence intensities can lead to considerable influences on the power generation efficiency and wake characteristics of a standalone wind turbine 1–6 . A review study by Porte‐Agel et al 7 summarized the relevant computational, analytical, and experimental research efforts on the interactions of atmospheric boundary layer (ABL) flow with wind turbines and wind farms, with a particular emphasis on our understanding and strategies for modeling the turbine wake flows and their impact on the ABL turbulence structure and wind farm power generation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effects of inflow turbulence intensity and turbine arrangements on the power generation efficiency of large wind farms

Lin

Chang

2020

Wind Energy

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In this study, we conduct a series of large-eddy simulations (LESs) to study the impact of different incoming turbulent boundary layer flows over large wind farms, with a particular focus on the overall efficiency of electricity production and the evolution of the turbine wake structure. Five representative turbine placements in the large wind farm are considered, including an aligned layout and four staggered layouts with lateral or vertical offset arrangements. Four incoming flow conditions are used and arranged from the LESs of the ABL flow over homogeneous flat surfaces with four different aerodynamic roughness lengths (i.e., z0 = 0.5, 0.1, 0.01, and 0.0001 m), where the hub-height turbulence intensity levels are about 11.1%, 8.9%, 6.8%, and 4.9%, respectively. The simulation results indicate that an enhancement in the inflow turbulence level can effectively increase the power generation efficiency in the large wind farms, with about 23.3% increment on the overall farm power production and up to about 32.0% increment on the downstream turbine power production. Under the same inflow condition, the change of the turbine-array layouts can increase power outputs within the first 10 turbine rows, which has a maximum increment of about 26.5% under the inflow condition with low turbulence. By comparison, the increase of the inflow turbulence intensity facilitates faster wake recovery that raises the power generation efficiency of large wind farms than the adjustment of the turbine placing layouts. K E Y W O R D Slarge eddy simulation, power output, surface roughness, turbulence intensity, wind farm layout

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Section: Introductionmentioning

confidence: 99%

Effects of inflow turbulence intensity and turbine arrangements on the power generation efficiency of large wind farms

Lin

Chang

2020

Wind Energy

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“…To establish the reliability of offshore wind turbines for continuous power generation, it is imperative to understand the impact of turbulent flow conditions on their aerodynamic performance and underlying fluid-structure-acoustic interaction. Traditionally, computational modeling of turbulent flows for these systems involves using various Reynolds-Averaged Navier-Stoke (RANS) equations-based models [13][14][15]19,24,[26][27][28][29], large eddy simulations (LES) [30,31], and different versions of detached eddy simulations (DES) [16][17][18]32]. Other low-order wake models [33] are also introduced along with potential flow-based methods to handle unsteady flow dynamics.…”

Section: Flow Characterization Of Offshore Wind Turbinesmentioning

confidence: 99%

“…It has not been explained in the study how the algorithm will address (or be extended to tackle) the multi-component flows with air-water interface and loads simultaneously applied by both wind and water on turbine rotors. Naderi et al [27] developed steady-state computational models of wind farms based on actuator disks coupled with numerical schemes of computational fluid dynamics in OpenFOAM. Figure 7 presents velocity variations in a wind farm, depicting the extent of wake recovery for different angles of the incoming wind.…”

Section: Offshore Wind Turbine Farmsmentioning

confidence: 99%

A Review of Recent Advancements in Offshore Wind Turbine Technology

et al. 2022

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Offshore wind turbines are becoming increasingly popular due to their higher wind energy harnessing capabilities and lower visual pollution. Researchers around the globe have been reporting significant scientific advancements in offshore wind turbines technology, addressing key issues, such as aerodynamic characteristics of turbine blades, dynamic response of the turbine, structural integrity of the turbine foundation, design of the mooring cables, ground scouring and cost modelling for commercial viability. These investigations range from component-level design and analysis to system-level response and optimization using a multitude of analytical, empirical and numerical techniques. With such wide-ranging studies available in the public domain, there is a need to carry out an extensive yet critical literature review on the recent advancements in offshore wind turbine technology. Offshore wind turbine blades’ aerodynamics and the structural integrity of offshore wind turbines are of particular importance, which can lead towards system’s optimal design and operation, leading to reduced maintenance costs. Thus, in this study, our focus is to highlight key knowledge gaps in the scientific investigations on offshore wind turbines’ aerodynamic and structural response. It is envisaged that this study will pave the way for future concentrated efforts in better understanding the complex behavior of these machines.

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“…In the current LES model, the effect of the turbine rotor on the wind-velocity field is modeled using the actuator-disk model [26][27][28][29]. Following Meyers and Meneveau [28], turbine-induced force f t (per unit mass of air) is modeled as:…”

Section: Large-eddy Simulation Model For Wind Fieldsmentioning

confidence: 99%

Large-Eddy Simulation-Based Study of Effect of Swell-Induced Pitch Motion on Wake-Flow Statistics and Power Extraction of Offshore Wind Turbines

Xiao

Yang

2019

Energies

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In this study, the effects of ocean swell waves and swell-induced pitch motion on the wake-flow statistics and power extraction of floating wind turbines are numerically investigated. A hybrid numerical model coupling wind large-eddy (LES) and high-order spectral-wave simulations is employed to capture the effects of ocean swell waves on offshore wind. In the simulation, 3 × 3 floating wind turbines with prescribed pitch motions were modeled using the actuator disk model. The turbulence statistics and wind-power extraction rate for the floating turbines are quantified and compared to a reference case with fixed turbines. Statistical analysis based on the phase-average approach shows significant swell-correlated wind-velocity variations in both cases, and the swell-induced pitch motion of floating turbines is found to cause oscillations of wind-turbulence intensity and Reynolds stress, as well as an increase of vertical velocity variance in the near-wake region. Swells also cause periodic oscillation in extracted power density in the fixed turbine case, and the turbine pitch motion in the floating turbine case could further modulate this oscillation by shifting the phase dependence by about 180 degrees with respect to the swell-wave phase.

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Modeling of horizontal axis wind turbine wakes in Horns Rev offshore wind farm using an improved actuator disc model coupled with computational fluid dynamic

Cited by 74 publications

References 38 publications

Effects of inflow turbulence intensity and turbine arrangements on the power generation efficiency of large wind farms

Effects of inflow turbulence intensity and turbine arrangements on the power generation efficiency of large wind farms

A Review of Recent Advancements in Offshore Wind Turbine Technology

Large-Eddy Simulation-Based Study of Effect of Swell-Induced Pitch Motion on Wake-Flow Statistics and Power Extraction of Offshore Wind Turbines

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