Investigations into the Interaction of a Wind Turbine with Atmospheric Turbulence in Complex Terrain

Schulz, Christoph; Klein, Levin; Weihing, Pascal; Lutz, Th.

doi:10.1088/1742-6596/753/3/032016

Cited by 22 publications

(17 citation statements)

References 14 publications

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“…(Unsteady) Reynolds-Averaged Navier-Stokes equations ((U)RANS) numerical simulations are performed with the block-structured, finite-volume flow solver FLOWer developed by the German Aerospace Center (DLR) [14], with extensions for wind turbines simulations by the University of Stuttgart ( [15], [16]). The code solves the finite three dimensional, compressible (Unsteady) Reynolds-Averaged Navier-Stokes equations using the second order central JamesonSchmidt-Turkel scheme (JST) to determine the convective fluxes.…”

Section: Urans Simulation Setupmentioning

confidence: 99%

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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Section: Urans Simulation Setupmentioning

confidence: 99%

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Cormier

Caboni

Lutz

et al. 2018

J. Phys.: Conf. Ser.

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“…This site has been the subject of many coordinated studies [16,[18][19][20]. A small remotely-piloted aircraft was used to measure the flow conditions [18].…”

Section: Local Conditionsmentioning

confidence: 99%

Reducing the Uncertainty of Lidar Measurements in Complex Terrain Using a Linear Model Approach

2018

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In complex terrain, ground-based lidar wind speed measurements sometimes show noticeable differences compared to measurements made with in-situ sensors mounted on meteorological masts. These differences are mostly caused by the inhomogeneities of the flow field and the applied reconstruction methods. This study investigates three different methods to optimize the reconstruction algorithm in order to improve the agreement between lidar measurements and data from sensors on meteorological masts. The methods include a typical velocity azimuth display (VAD) method, a leave-one-out cross-validation method, and a linear model which takes into account the gradients of the wind velocity components. In addition, further aspects such as the influence of the half opening angle of the scanning cone and the scan duration are considered. The measurements were carried out with two different lidar systems, that measured simultaneously. The reference was a 100 m high meteorological mast. The measurements took place in complex terrain characterized by a 150 m high escarpment. The results from the individual methods are quantitatively compared with the measurements of the cup anemometer mounted on the meteorological mast by means of the three parameters of a linear regression (slope, offset, R 2 ) and the width of the 5th–95th quantile. The results show that expanding the half angle of the scanning cone from 20 ∘ to 55 ∘ reduces the offset by a factor of 14.9, but reducing the scan duration does not have an observable benefit. The linear method has the lowest uncertainty and the best agreement with the reference data (i.e., lowest offset and scatter) of all of the methods that were investigated.

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“…[1,14,15]. Therefore, the effect of thermal stratifications in complex terrain can be investigated as next step.…”

Section: Type Bmentioning

confidence: 99%

Wind-turbine wakes responding to stably stratified flow over complex terrain

Englberger¹,

Dörnbrack²

2018

J. Phys.: Conf. Ser.

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Abstract. The wake characteristics of a hill-top wind turbine are investigated by means of large-eddy simulations (LESs) of stably stratified atmospheric boundary-layer (ABL) flows. All simulations are conducted with synchronized turbulent inflow data retrieved from an LES of diurnal cycle-driven boundary-layer flow over homogeneous surface. An investigation of different (weak, moderate, strong) stably stratified flow regimes passing over various 3 D hill configurations with heights up to 50 m reveals that the occurrence of flow separation not only depends on hill properties but also on the atmospheric stratification. The hill-top wake characteristics of all flow regimes are compared with wakes resulting from the same flow fields passing through the same wind turbine, however, sited on a homogeneous surface. For the same atmospheric stratification the flow over the hill impacts only the near-wake region. In contrast, the stratification impact on the hill-top wind-turbine wake is much more distinct, especially, in the far wake.

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Investigations into the Interaction of a Wind Turbine with Atmospheric Turbulence in Complex Terrain

Cited by 22 publications

References 14 publications

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Numerical analysis of unsteady aerodynamics of floating offshore wind turbines

Reducing the Uncertainty of Lidar Measurements in Complex Terrain Using a Linear Model Approach

Wind-turbine wakes responding to stably stratified flow over complex terrain

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