Results 31 to 40 of about 1,171,754 (192)

Efficiency and spectrum of internal gamma-ray burst shocks [PDF]

, 2001
We present an analysis of the Internal Shock Model of GRBs, where gamma-rays are produced by internal shocks within a relativistic wind. We show that observed GRB characteristics impose stringent constraints on wind and source parameters.
D. Guetta, E. Waxman, Frail D. A., Kats J. I., Lazzati D., M. Spada, Wijers R.   +6 more
core   +1 more source

Low-level jets in the North and Baltic seas: mesoscale model sensitivity and climatology using WRF V4.2.1 [PDF]

Geoscientific Model Development
Low-level jets (LLJs), characterized by wind speed maxima in the lower part of the atmospheric boundary layer, play a crucial role in shaping wind resource availability, particularly as modern wind turbines reach heights exceeding 200 m.
B. T. E. Olsen, A. N. Hahmann, N. G. Alonso-de-Linaje, M. Žagar, M. Dörenkämper   +4 more
doaj   +1 more source

Analysis of control-oriented wake modeling tools using lidar field results [PDF]

Wind Energy Science, 2018
The objective of this paper is to compare field data from a scanning lidar mounted on a turbine to control-oriented wind turbine wake models. The measurements were taken from the turbine nacelle looking downstream at the turbine wake.
J. Annoni, P. Fleming, A. Scholbrock, J. Roadman, S. Dana, C. Adcock, F. Porte-Agel, S. Raach, F. Haizmann, D. Schlipf   +9 more
doaj   +1 more source

The Making of the New European Wind Atlas – Part 2: Production and evaluation [PDF]

Geoscientific Model Development, 2020
This is the second of two papers that document the creation of the New European Wind Atlas (NEWA). In Part 1, we described the sensitivity experiments and accompanying evaluation done to arrive at the final mesoscale model setup used to produce the ...
M. Dörenkämper, B. T. Olsen, B. Witha, B. Witha, A. N. Hahmann, N. N. Davis, J. Barcons, Y. Ezber, E. García-Bustamante, J. F. González-Rouco, J. Navarro, M. Sastre-Marugán, T. Sīle, W. Trei, M. Žagar, J. Badger, J. Gottschall, J. Sanz Rodrigo, J. Mann   +18 more
doaj   +1 more source

Quarter-Century Offshore Winds from SSM/I and WRF in the North Sea and South China Sea

Remote Sensing, 2016
We study the wind climate and its long-term variability in the North Sea and South China Sea, areas relevant for offshore wind energy development, using satellite-based wind data, because very few reliable long-term in-situ sea surface wind observations ...
Charlotte Bay Hasager, Poul Astrup, Rong Zhu, Rui Chang, Merete Badger, Andrea N. Hahmann   +5 more
doaj   +1 more source

A simulation study demonstrating the importance of large-scale trailing vortices in wake steering [PDF]

Wind Energy Science, 2018
In this paper, we investigate the role of flow structures generated in wind farm control through yaw misalignment. A pair of counter-rotating vortices is shown to be important in deforming the shape of the wake and in explaining the asymmetry of wake ...
P. Fleming, J. Annoni, M. Churchfield, L. A. Martinez-Tossas, K. Gruchalla, M. Lawson, P. Moriarty   +6 more
doaj   +1 more source

Stellar wind bubbles around WR and [WR] stars [PDF]

, 2002
We study the dynamics of stellar wind bubbles around hydrogen-deficient stars using numerical simulations with time- and ion dependent cooling. We consider two types of hydrogen-deficient stars, massive WR stars, producing Ring Nebulae, and low mass [WR]
Abbott, Acker, Balick, Cappa, Chevalier, Chu, Cox, Cox, Dalgarno, Dwarkadas, Frank, G. Mellema, Gaetz, Garcia-Segura, Garcia-Segura, Garcia-Segura, Gould, Gronenschild, Górny, Herwig, Kahn, Karzas, Koesterke, Koo, Koo, Mellema, Mellema, Mellema, P. Lundqvist, Pittard, Plewa, Raga, Raymond, Roe, Sutherland, Treffers, Van Buren, Wrigge   +37 more
core   +3 more sources

Blade Surface Pressure Measurements in the Field and Their Usage for Aerodynamic Model Validation

Wind Energy
This study presents results from a long‐term measurement campaign on a research wind turbine in the field. Pressure measurements are conducted at 25% blade radius over several months.
Erik Fritz, Koen Boorsma, Marco Caboni, Andreas Herrig   +3 more
doaj   +1 more source

Weibull parameters determined from a comprehensive dataset of tensile testing of single carbon fibres

Data in Brief
This data article presents tensile properties of about 1200 single carbon fibres (PYROFIL™ TRW40 50L) tested at eight different gauge lengths in the range of L0∈ [20; 80] mm with approximately 150 tested fibres for each length.
Rajnish Kumar, Lars P. Mikkelsen, Hans Lilholt, Bo Madsen   +3 more
doaj   +1 more source

Comparison of wind farm control strategies under realistic offshore wind conditions: turbine quantities of interest [PDF]

Wind Energy Science
Wind farm flow control is a strategy to increase the efficiency and therefore lower the levelized cost of energy of a wind farm. This is done using turbine settings such as the yaw angle, blade pitch angles, or generator torque to manipulate the flow ...
J. A. Frederik, E. Simley, K. A. Brown, G. R. Yalla, L. C. Cheung, P. A. Fleming   +5 more
doaj   +1 more source