A5067324854- Wind Energy Research and Development
- Wind and Air Flow Studies
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Climate variability and models
- Energy Load and Power Forecasting
- Ocean Waves and Remote Sensing
- Icing and De-icing Technologies
- Fluid Dynamics and Vibration Analysis
- Aeolian processes and effects
- Atmospheric aerosols and clouds
- Tropical and Extratropical Cyclones Research
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Plant Water Relations and Carbon Dynamics
- Oceanographic and Atmospheric Processes
- Vehicle emissions and performance
- Integrated Energy Systems Optimization
- Marine and Offshore Engineering Studies
- Coastal and Marine Dynamics
- Aerodynamics and Fluid Dynamics Research
- Remote Sensing and LiDAR Applications
- Solar Radiation and Photovoltaics
- Arctic and Antarctic ice dynamics
- Atmospheric Ozone and Climate
Cornell University
2016-2025
National Renewable Energy Laboratory
2023
Sibley Memorial Hospital
2015-2021
Aarhus University
2016
Indiana University Bloomington
2005-2014
Eugene O'Neill Theater Center
2011-2014
Indiana University
1996-2013
Indiana University – Purdue University Indianapolis
2009-2013
National Institute of Meteorology
2009-2011
Carnegie Mellon University
2011
Abstract The proposed model for the wind speed deficit in farms is analytical and encompasses both small extending over large areas. As often need offshore farms, handles a regular array geometry with straight rows of turbines equidistant spacing between units each row rows. Firstly, case flow direction being parallel to rectangular considered by defining three regimes. Secondly, when not line main rows, solutions are suggested patterns turbine corresponding direction. presentation an...
Abstract Average power losses due to wind turbine wakes are of the order 10 20% total output in large offshore farms. Accurately quantifying is, therefore, an important part overall farm economics. The focus this research is compare different types models from computational fluid dynamics (CFD) terms how accurately they represent wake when compared with measurements ultimate objective improve modelling flow for farms optimize layouts reduce and loads. presented EC‐funded UpWind project,...
ABSTRACT The wind turbine operational characteristics, power measurements and meteorological from Horns Rev offshore farm have been identified, synchronized, quality screened stored in a common database as 10 min statistical data. A number of flow cases identified to describe the inside farm, deficits along rows turbines determined for different inflow directions speed intervals. method classify atmospheric stability based on Bulk‐Ri has implemented. Long‐term conditions established, which...
Abstract There is an urgent need to develop and optimize tools for designing large wind farm arrays deployment offshore. This research focused on improving the understanding of, modeling turbine wakes in order make more accurate power output predictions offshore farms. Detailed data ensembles of losses due at farms Nysted Horns Rev are presented analyzed. Differences spacing (10.5 versus 7 rotor diameters) not differentiable wake-related from two partly high variability despite careful...
A comprehensive intercomparison of historical wind speed trends over the contiguous United States is presented based on two observational data sets, four reanalysis and output from regional climate models (RCMs). This research thus contributes to detection, quantification, attribution temporal in speeds within historical/contemporary provides an evaluation RCMs being used develop future scenarios. Under assumption that changes climates are partly driven by variability evolution global...
Abstract This paper gives an evaluation of most the commonly used models for predicting wind speed decrease (wake) downstream a turbine. The is based on six experiments where free-stream and wake profiles were measured using ship-mounted sodar at small offshore farm. conducted varying distances between 1.7 7.4 rotor diameters Evaluation compares predicted observed velocity deficits hub height. A new method determining cumulative momentum deficit over described. Despite apparent simplicity...
Abstract Here, we quantify relationships between wind farm efficiency and speed, direction, turbulence atmospheric stability using power output from the large offshore at Nysted in Denmark. Wake losses are, as expected, most strongly related to speed variations through turbine thrust coefficient; with important second order effects. While is highly dependent on distribution of speeds it shown that impact spacing wake can be quantified, albeit relatively uncertainty due stochastic effects...
Abstract Understanding of power losses and turbulence increase due to wind turbine wake interactions in large offshore farms is crucial optimizing farm design. Power wakes are quantified based on observations from Middelgrunden state‐of‐the‐art models. Observed solely approximately 10% average. These relatively high for a single line turbines part the close spacing farm. The model Wind Analysis Application Program (WAsP) shown capture despite operating beyond its specifications spacing....
Abstract A grand challenge from the wind energy industry is to provide reliable forecasts on mountain winds several hours in advance at microscale (∼100 m) resolution. This requires better wind-energy physics included forecasting tools, for which field observations are imperative. While mesoscale (∼1 km) measurements abound, processes not monitored practice nor do plentiful exist this scale. After a decade of preparation, group European and U.S. collaborators conducted campaign during 1...
ABSTRACT Computational fluid dynamic (CFD) methods are used in this paper to predict the power production from entire wind farms complex terrain and shed some light into wake flow patterns. Two full three‐dimensional Navier–Stokes solvers for incompressible flow, employing k − ϵ ω turbulence closures, used. The turbines modeled as momentum absorbers by means of their thrust coefficient through actuator disk approach. Alternative estimating reference speed calculation tested. work presented...
The energy sector comprises approximately two-thirds of global total greenhouse gas emissions. For this and other reasons, renewable resources including wind power are being increasingly harnessed to provide electricity generation potential with negligible emissions carbon dioxide. resource is naturally a function the climate system because “fuel” incident speed thus determined by atmospheric circulation. Some recent articles have reported historical declines in measured near-surface speeds,...
This scientific assessment examines changes in three climate extremes—extratropical storms, winds, and waves—with an emphasis on U.S. coastal regions during the cold season. There is moderate evidence of increase both extratropical storm frequency intensity season Northern Hemisphere since 1950, with suggestive geographic shifts resulting slight upward trends offshore/coastal regions. also extreme winds (at least annually) over parts ocean early to mid-1980s, but land surface inconclusive....
Global wind resources greatly exceed current electricity demand and the levelized cost of energy from turbines has shown precipitous declines. Accordingly, installed capacity grew at an annualized rate about 14% during last two decades now provide ~6–7% global supply. This renewable generation source is thus already playing a role in reducing greenhouse gas emissions sector. Here we document trends within industry, examine projections future increases compute associated climate change...
Two years of high-resolution simulations conducted with the Weather Research and Forecasting (WRF) model are used to characterize frequency, intensity height low-level jets (LLJ) over U.S. Atlantic coastal zone. Meteorological conditions occurrence characteristics LLJs described for (i) centroids thirteen sixteen active offshore wind energy lease areas off east coast (ii) along two transects extending from coastline across northern (LA). Flow close nominal hub-height turbines is...