Synthetic atmospheric turbulence and wind shear in large eddy simulations of wind turbine wakes

Wind Energy ◽  
2013 ◽  
Vol 17 (8) ◽  
pp. 1247-1267 ◽  
Author(s):  
Rolf-Erik Keck ◽  
Robert Mikkelsen ◽  
Niels Troldborg ◽  
Martin de Maré ◽  
Kurt S. Hansen
Keyword(s):  
Wind Turbine ◽  
Atmospheric Turbulence ◽  
Wind Shear ◽  
Large Eddy Simulations ◽  
Large Eddy

scholarly journals Wake meandering statistics of a model wind turbine: Insights gained by large eddy simulations

2016 ◽  
Vol 1 (4) ◽  
Author(s):  
Daniel Foti ◽  
Xiaolei Yang ◽  
Michele Guala ◽  
Fotis Sotiropoulos
Keyword(s):  
Wind Turbine ◽  
Large Eddy Simulations ◽  
Large Eddy

Large-Eddy Simulations of realistic atmospheric turbulence with the DLR-TAU-code initialized by in situ airborne measurements

2012 ◽  
Vol 66 ◽  
pp. 121-129 ◽  
Author(s):  
Torsten Auerswald ◽  
Jens Bange ◽  
Tobias Knopp ◽  
Keith Weinman ◽  
Rolf Radespiel
Keyword(s):  
Atmospheric Turbulence ◽  
Large Eddy Simulations ◽  
Airborne Measurements ◽  
Large Eddy

scholarly journals Large eddy simulations of offshore wind turbine wakes for two floating platform types

2020 ◽  
Vol 1452 ◽  
pp. 012034
Author(s):  
H M Johlas ◽  
L A Martínez-Tossas ◽  
M A Lackner ◽  
D P Schmidt ◽  
M J Churchfield
Keyword(s):  
Wind Turbine ◽  
Large Eddy Simulations ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Floating Platform ◽  
Large Eddy

scholarly journals Non-steady wind turbine response to daytime atmospheric turbulence

2017 ◽  
Vol 375 (2091) ◽  
pp. 20160103 ◽  
Author(s):  
Tarak N. Nandi ◽  
Andreas Herrig ◽  
James G. Brasseur
Keyword(s):  
Field Experiment ◽  
Wind Turbine ◽  
Atmospheric Turbulence ◽  
Time Scales ◽  
Leading Edge ◽  
Turbine Rotor ◽  
Atmospheric Conditions ◽  
Time Resolved ◽  
Eddy Simulation ◽  
Large Eddy

Relevant to drivetrain bearing fatigue failures, we analyse non-steady wind turbine responses from interactions between energy-dominant daytime atmospheric turbulence eddies and the rotating blades of a GE 1.5 MW wind turbine using a unique dataset from a GE field experiment and computer simulation. Time-resolved local velocity data were collected at the leading and trailing edges of an instrumented blade together with generator power, revolutions per minute, pitch and yaw. Wind velocity and temperature were measured upwind on a meteorological tower. The stability state and other atmospheric conditions during the field experiment were replicated with a large-eddy simulation in which was embedded a GE 1.5 MW wind turbine rotor modelled with an advanced actuator line method. Both datasets identify three important response time scales: advective passage of energy-dominant eddies (≈25–50 s), blade rotation (once per revolution (1P), ≈3 s) and sub-1P scale (<1 s) response to internal eddy structure. Large-amplitude short-time ramp-like and oscillatory load fluctuations result in response to temporal changes in velocity vector inclination in the aerofoil plane, modulated by eddy passage at longer time scales. Generator power responds strongly to large-eddy wind modulations. We show that internal dynamics of the blade boundary layer near the trailing edge is temporally modulated by the non-steady external flow that was measured at the leading edge, as well as blade-generated turbulence motions. This article is part of the themed issue ‘Wind energy in complex terrains’.

A simple atmospheric boundary layer model applied to large eddy simulations of wind turbine wakes

Wind Energy ◽  
2013 ◽  
Vol 17 (4) ◽  
pp. 657-669 ◽  
Author(s):  
Niels Troldborg ◽  
Jens N. Sørensen ◽  
Robert Mikkelsen ◽  
Niels N. Sørensen
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Wind Turbine ◽  
Large Eddy Simulations ◽  
Layer Model ◽  
Boundary Layer Model ◽  
Large Eddy

scholarly journals Wind turbine wakes in forest and neutral plane wall boundary layer large-eddy simulations

2016 ◽  
Vol 753 ◽  
pp. 032058 ◽  
Author(s):  
Josef Schröttle ◽  
Zbigniew Piotrowski ◽  
Thomas Gerz ◽  
Antonia Englberger ◽  
Andreas Dörnbrack
Keyword(s):  
Boundary Layer ◽  
Wind Turbine ◽  
Large Eddy Simulations ◽  
Plane Wall ◽  
Neutral Plane ◽  
Wall Boundary Layer ◽  
Wall Boundary ◽  
Large Eddy

Comparison of Mann Turbulence and atmospheric turbulence as inflow conditions on a wind turbine in large-eddy simulations (LES)

2021 ◽  
Author(s):  
Linus Wrba ◽  
Antonia Englberger
Keyword(s):  
Wind Turbine ◽  
Atmospheric Surface Layer ◽  
Turbine Blades ◽  
Potential Temperature ◽  
Large Eddy Simulations ◽  
Wind Turbine Blades ◽  
Large Eddy ◽  
The Impact ◽  
Inflow Conditions ◽  
Blade Element

&lt;p&gt;This study deals with different inflow conditions on wind-turbines in LES in order to analyse the impact on the wake. The wind turbine regarded in this study has a hub height of 57.19 m while the radius of the blade measures 40m. Furthermore, the blade element momentum method (BEM) is used to calculate the development forces of the wind turbine blades on the flow. First, the syntheticly generated turbulence of a Mann[1] box generator is considered. Second, atmospheric boundary layer simulations from Englberger and D&amp;#246;rnbrack (2018) are applied as inflow conditions for the three wind components and the potential temperature to calculate the wake of the wind turbine. The distribution of turbulent kinetic energy in eddys of different sizes is worked out in their energy spectrum.The inflow conditions represent the -5/3 Kolmogorov spectrum. The wake characteristics are evaluated for both inflow datasets and the arising differences are discussed in this study&lt;/p&gt;&lt;div&gt;&lt;br&gt;&lt;div&gt; &lt;p&gt;[1] Mann, J. (1994). The spatial structure of neutral atmospheric surface-layer turbulence. Journal of fluid mechanics 273&lt;/p&gt; &lt;/div&gt; &lt;/div&gt;&lt;div&gt;&lt;br&gt;&lt;div&gt; &lt;p&gt;&amp;#160;&lt;/p&gt; &lt;/div&gt; &lt;/div&gt;

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