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.
Wind-turbine wakes responding to stably stratified flow over complex terrain
Journal of Physics: Conference Series ; 1037 ; 1-11
2018
Article (Journal)
Electronic Resource
German
Collapse of turbulent wakes in stably stratified media
AIAA | 1980
|AIAA | 1979
Further studies on wind turbine generator wakes
AIAA | 1980
|Dynamic Mode Decomposition of Stratified Wakes
AIAA | 2019
|