Aliza Abraham
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View article: Influence of simple terrain on the spatial variability of a low-level jet and wind farm performance in the AWAKEN field campaign
Influence of simple terrain on the spatial variability of a low-level jet and wind farm performance in the AWAKEN field campaign Open
In wind energy research, scientific challenges are often associated with complex terrain sites, where orography, vegetation, and buildings disrupt flow uniformity. However, even sites characterized as simple terrain can exhibit significant…
View article: Temperature profiling at the American WAKE ExperimeNt (AWAKEN): methodology and uncertainty quantification
Temperature profiling at the American WAKE ExperimeNt (AWAKEN): methodology and uncertainty quantification Open
We quantify the accuracy of the temperature profiling from ground-based spectral infrared radiance observations at AWAKEN. Results from pre-campaign tests and comparisons with in-situ ground-based and airborne sensors at AWAKEN indicate th…
View article: Operational wind plants increase planetary boundary layer height: an observational study
Operational wind plants increase planetary boundary layer height: an observational study Open
As wind energy deployment grows, interactions between wind plants and the surrounding environment become more prevalent. The current investigation seeks to understand these interactions by characterizing the impact of wind plants on the pl…
View article: Large-eddy simulation of an atmospheric bore and associated gravity wave effects on wind farm performance in the southern Great Plains
Large-eddy simulation of an atmospheric bore and associated gravity wave effects on wind farm performance in the southern Great Plains Open
Gravity waves are a common occurrence in the atmosphere, with a variety of generation mechanisms. Their impact on wind farms has only recently gained attention, with most studies focused on wind farm-induced gravity waves. In this study, t…
View article: Influence of simple terrain on the spatial variability of a low-level jet and wind farm performance in the AWAKEN field campaign
Influence of simple terrain on the spatial variability of a low-level jet and wind farm performance in the AWAKEN field campaign Open
In wind energy research, scientific challenges are often associated with complex terrain sites, where orography, vegetation, and buildings disrupt flow uniformity. However, even sites characterized as simple terrain can exhibit significant…
View article: Measurement of Wind Loading on Heliostats at the Crescent Dunes Power Plant: An Overview
Measurement of Wind Loading on Heliostats at the Crescent Dunes Power Plant: An Overview Open
The cost of solar collectors constitutes almost one third of the total cost of a CSP plant. One of the ongoing challenges in the design of these collectors is wind loading on mirrors, support structures, and drives. A particular challenge …
View article: Studying Wind Loading on CSP Collectors to Improve Performance and Reliability
Studying Wind Loading on CSP Collectors to Improve Performance and Reliability Open
Electricity generation through Concentrating Solar-thermal Power (CSP) adds the advantage of thermal energy storage and heat production. CSP collector costs constitute nearly one-third of total plant costs. Managing wind loading, especiall…
View article: Operational wind plants increase planetary boundary layer height: An observational study
Operational wind plants increase planetary boundary layer height: An observational study Open
As wind energy deployment grows, interactions between wind plants and the surrounding environment become more prevalent. The current investigation seeks to understand these interactions by characterizing the impact of wind plants on the pl…
View article: Modification of wind turbine wakes by large-scale, convective atmospheric boundary layer structures
Modification of wind turbine wakes by large-scale, convective atmospheric boundary layer structures Open
In this study, we consider the impact of large-scale, convective structures in an unstable atmospheric boundary layer on wind turbine wakes. Simulation data from a high-fidelity large-eddy simulation (LES) of the AWAKEN wind farm site matc…
View article: Overview of preparation for the American WAKE ExperimeNt (AWAKEN)
Overview of preparation for the American WAKE ExperimeNt (AWAKEN) Open
The American WAKE ExperimeNt (AWAKEN) is a multi-institutional field campaign focused on gathering critical observations of wind farm–atmosphere interactions. These interactions are responsible for a large portion of the uncertainty in win…
View article: Large-eddy simulation of an atmospheric bore and associated gravity wave effects on wind farm performance in the Southern Great Plains
Large-eddy simulation of an atmospheric bore and associated gravity wave effects on wind farm performance in the Southern Great Plains Open
Gravity waves are a common occurrence in the atmosphere, with a variety of generation mechanisms. Their impact on wind farms has only recently gained attention, with most studies focused on wind farm-induced gravity waves. In this study, t…
View article: Land-based wind plant wake characterization using dual-Doppler radar measurements at AWAKEN
Land-based wind plant wake characterization using dual-Doppler radar measurements at AWAKEN Open
Wind plant wakes have been shown to persist for tens of kilometers downstream in offshore environments, reducing the power output of neighboring plants, but their behavior on land remains relatively unexplored through observation. This stu…
View article: Investigation of Wind Plant Wake Effects at the AWAKEN Field Campaign
Investigation of Wind Plant Wake Effects at the AWAKEN Field Campaign Open
Wind plant wakes characterized by lower momentum flow with increased turbulent kinetic energy (TKE) have been shown to propagate for several kilometers and interact with neighboring plants. To better understand these interactions, an Oklah…
View article: Numerical investigation of rotor asymmetry to promote wake recovery
Numerical investigation of rotor asymmetry to promote wake recovery Open
Tip vortices in the wakes of wind turbines are known to have detrimental effects on downstream turbines such as reduced performance and increased fatigue loading. Rotor asymmetry is investigated as a passive method for mitigating these eff…
View article: Experimental investigation of blade tip vortex behavior in the wake of asymmetric rotors
Experimental investigation of blade tip vortex behavior in the wake of asymmetric rotors Open
Wakes behind rotors such as wind turbines, propellers, and helicopters can have detrimental effects on downstream structures including increased structural loading. These wakes are characterized by helical vortices shed from the blade tips…
View article: Simplified model for helical vortex dynamics in the wake of an asymmetric rotor
Simplified model for helical vortex dynamics in the wake of an asymmetric rotor Open
Helical vortex systems, such as those found in the wakes of wind turbines, helicopter rotors and propellers, are subject to instabilities that lead to pairing between adjacent vortex loops. Certain modes of these instabilities can be trigg…
View article: Global pairing instabilities of three interlaced helical vortices in the wake of an asymmetric rotor
Global pairing instabilities of three interlaced helical vortices in the wake of an asymmetric rotor Open
International audience
View article: Instability of three interlaced helical vortices: application to asymmetric. rotor wakes
Instability of three interlaced helical vortices: application to asymmetric. rotor wakes Open
International audience
View article: Simplified model for capturing helical vortex interactions with applications to asymmetric rotor wakes
Simplified model for capturing helical vortex interactions with applications to asymmetric rotor wakes Open
International audience
View article: Characterization of atmospheric coherent structures and their impact on a utility-scale wind turbine
Characterization of atmospheric coherent structures and their impact on a utility-scale wind turbine Open
Atmospheric turbulent velocity fluctuations are known to increase wind turbine structural loading and accelerate wake recovery, but the impact of vortical coherent structures in the atmosphere on wind turbines has not yet been evaluated. T…
View article: Characterization of atmospheric coherent structures and their impact on a utility-scale wind turbine
Characterization of atmospheric coherent structures and their impact on a utility-scale wind turbine Open
Atmospheric turbulent velocity fluctuations are known to increase wind turbine structural loading and accelerate wake recovery, but the impact of vortical coherent structures in the atmosphere on wind turbines has not yet been evaluated. T…
View article: Super-large-scale flow visualization using natural snowfall for the study of utility-scale wind turbine flows
Super-large-scale flow visualization using natural snowfall for the study of utility-scale wind turbine flows Open
With the rapid growth of wind turbine installation in recent decades, fundamental physical understanding of the flow around wind turbines and farms is becoming increasingly critical for further efficiency increases. However, the effort to …
View article: Mechanisms of dynamic near-wake modulation of a utility-scale wind turbine
Mechanisms of dynamic near-wake modulation of a utility-scale wind turbine Open
The current study uses large eddy simulations to investigate the transient response of a utility-scale wind turbine wake to dynamic changes in atmospheric and operational conditions, as observed in previous field-scale measurements. Most w…
View article: Evidence of preferential sweeping during snow settling in atmospheric turbulence
Evidence of preferential sweeping during snow settling in atmospheric turbulence Open
We present a field study of snow settling dynamics based on simultaneous measurements of the atmospheric flow field and snow particle trajectories. Specifically, a super-large-scale particle image velocimetry (SLPIV) system using natural s…