Searched for: subject%3A%22Atmospheric%255C+boundary%255C+layer%22
(1 - 16 of 16)
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Allaerts, D.J.N. (author), Quon, Eliot (author), Churchfield, Matt (author)
Reproducing realistic date- and site-specific unsteady wind conditions in large-eddy simulations is becoming increasingly useful in wind energy. How to run a large-eddy simulation to match observed conditions, however, remains an open research question. One approach that has received considerable attention is mesoscale-to-microscale coupling,...
journal article 2023
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van de Krol, Bart (author)
The most used RANS-model in relation to wind farms, k−epsilon, has significant shortcomings. It over-predicts the eddy viscosity in the near-wake and fails to model the anisotropy of the turbulence quantities. The Sparse Regression of the Turbulence Stress Anisotropy (SpaRTA) method could remedy these shortcomings. This method uses temporally...
master thesis 2022
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Janssens, M. (author), Hulshoff, S.J. (author)
Data-driven parameterizations offer considerable potential for improving the fidelity of General Circulation Models. However, ensuring that these remain consistent with the governing equations while still producing stable simulations remains a challenge. In this paper, we propose a combined Variational-Multiscale (VMS) Artificial Neural...
journal article 2022
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van Hooft, J.A. (author)
Weather and climate influence life in many ways; varying climatic conditions can be associated with varying human cultures and on a day-to-day basis, the weather influences our plans and mood. As such, a proper prediction of the weather is of great importance. Ultimately, the weather is fueled by solar irradiation, which changes sharply over the...
doctoral thesis 2021
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Lu, Nan You (author), Manuel, Lance (author), Hawbecker, Patrick (author), Basu, S. (author)
Thunderstorm downbursts have been reported to cause damage or failure to wind turbine arrays. We extend a large-eddy simulation model used in previous work to generate downburst-related inflow fields with a view toward defining correlated wind fields that all turbines in an array would experience together during a downburst. We are also...
journal article 2021
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Sletsjøe, Håkon (author)
This thesis investigates terrain ruggedness characterization based on low-order terrain statistics. The statistics in question are the root-mean-square height and slope where the slopes are calculated both directly using the power spectral density and indirectly via a finite difference scheme. These statistics are, in contrast to the ruggedness...
master thesis 2020
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Bosveld, Fred C. (author), Baas, P. (author), Beljaars, Anton C.M. (author), Holtslag, Albert A.M. (author), de Arellano, Jordi Vilà Guerau (author), van de Wiel, B.J.H. (author)
An overview is given of 50-year Cabauw observations and research on the structure and dynamics of the atmospheric boundary layer. It is shown that over time this research site with its 200-m meteorological tower has grown into an atmospheric observatory with a comprehensive observational program encompassing almost all aspects of the...
journal article 2020
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Lu, Nan You (author), Hawbecker, Patrick (author), Basu, S. (author), Manuel, Lance (author)
Severe winds produced by thunderstorm downbursts pose a serious risk to the structural integrity of wind turbines. However, guidelines for wind turbine design (such as the International Electrotechnical Commission Standard, IEC 61400-1) do not describe the key physical characteristics of such events realistically. In this study, a large-eddy...
journal article 2019
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Hrebtov, Michael (author), Hanjalic, K. (author)
Seasonal variation of air quality in a city with a large river was investigated by means of numerical simulations of air movement and pollutant dispersion over inversion-capped diurnal cycles using a Reynolds-averaged Navier-Stokes (RANS) approach with algebraic turbulent flux model. The study accounts for the effects of urban heat island ...
journal article 2019
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Smink, M.M.E. (author), Assink, Jelle D. (author), Bosveld, Fred C. (author), Smets, P.S.M. (author), Evers, L.G. (author)
The Royal Netherlands Meteorological Institute (KNMI) operates a three-dimensional microbarometer array at the Cabauw Experimental Site for Atmospheric Research observatory. The array consists of five microbarometers on a meteorological tower up to an altitude of 200 m. Ten ground-based microbarometers surround the tower with an array aperture...
journal article 2019
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van Hooft, J.A. (author), Popinet, Stéphane (author), van Heerwaarden, Chiel C. (author), van der Linden, S.J.A. (author), de Roode, S.R. (author), van de Wiel, B.J.H. (author)
We present a proof-of-concept for the adaptive mesh refinement method applied to atmospheric boundary-layer simulations. Such a method may form an attractive alternative to static grids for studies on atmospheric flows that have a high degree of scale separation in space and/or time. Examples include the diurnal cycle and a convective...
journal article 2018
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Prats-Iraola, Pau (author), Lopez Dekker, F.J. (author), De Zan, Francesco (author), Yague-Martinez, Nestor (author), Zonno, Mariantonietta (author), Rodriguez-Cassola, Marc (author)
This paper addresses the performance in the retrieval of 3-D mean deformation maps by exploiting simultaneous or quasi-simultaneous squinted synthetic aperture radar (SAR) interferometric acquisitions in a repeat-pass scenario. In multisatellite or multibeam low earth observation missions, the availability of two (or more) lines of sight ...
journal article 2018
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Abbasi, A. (author), Annor, F.O. (author), van de Giesen, N.C. (author)
Atmospheric stability conditions over the water surface can affect the evaporative and convective heat fluxes from the water surface. Atmospheric instability occurred 72.5% of the time and resulted in 44.7 and 89.2% increases in the average and maximum estimated evaporation, respectively, when compared to the neutral condition for a small...
journal article 2017
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Vignon, Etienne (author), Hourdin, Frédéric (author), Genthon, Christophe (author), Gallée, Hubert (author), Bazile, Eric (author), Lefebvre, Marie Pierre (author), Madeleine, Jean Baptiste (author), van de Wiel, B.J.H. (author)
The parametrization of the atmospheric boundary layer (ABL) is critical over the Antarctic Plateau for climate modelling since it affects the climatological temperature inversion and the negatively buoyant near-surface flow over the ice-sheet. This study challenges state-of-the-art parametrizations used in general circulation models to...
journal article 2017
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Abbasi, A. (author)
This research aims at developing a flexible and efficient (numerical) approach for estimating energy balance and heat storage of small shallow lakes in arid and semi-arid regions. To reach to this aim, some numerical methods and improvements in conventional methods were done. Optimizing the methods developed in this thesis is considered in order...
doctoral thesis 2016
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Mehta, D. (author)
This thesis concerns the industrial application of large eddy simulation to wind farm aerodynamics. Through a series of simple tests, it presents the pros and cons of using energy-conserving time integration and furthers the importance of a dissipation-free spatial discretisation. Finally, it demonstrates the capability of the Energy-Conserving...
doctoral thesis 2016
Searched for: subject%3A%22Atmospheric%255C+boundary%255C+layer%22
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