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Tosto, F. (author)The vast majority of energy conversion systems currently makes use of fossil fuels, whose combustion generates harmful greenhouse gases. Transitioning to renewable energy sources is thus paramount to limiting the environmental impact of human activities on the climate. In this regard, the harvesting of wasted thermal energy constitutes a...doctoral thesis 2023
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Tosto, F. (author), Wheeler, Andrew (author), Pini, M. (author)In this work, we investigate the sources of dissipation in adiabatic boundary layers of non-ideal compressible fluid flows. Direct numerical simulations of transitional, zero-pressure gradient boundary layers are performed with an in-house solver considering two fluids characterized by different complexity of the fluid molecules, namely air...book chapter 2023
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Schilperoort, B. (author)Forests cover a large part of the globe, and are responsible for a large amount of evaporation and the fixation of carbon. To be able to better understand this atmospheric exchange of forests, and how the forests will behave under future climate change, both accurate measurements as well as models are required. However, due to their height and...doctoral thesis 2022
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Hu, W. (author)The backward/forward-facing step (BFS/FFS) is one of the canonical geometries in aerospace engineering applications, the flow field over which has attracted extensive attention in the past decades. In a supersonic flow, laminar-to-turbulent transition and shock wave/boundary layer interaction (SWBLI) can occur over these configurations, which...doctoral thesis 2020
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Neggers, R.A.J. (author), Ackerman, Andrew S. (author), Angevine, W. M. (author), Bazile, Eric (author), Beau, I. (author), Blossey, P. N. (author), Boutle, I. A. (author), de Bruijn, C. (author), cheng, A (author), van der Dussen, J.J. (author), Fletcher, J. (author), Dal Gesso, S. (author), Jam, A. (author), Kawai, H (author), Cheedela, S. K. (author), Larson, V. E. (author), Lefebvre, Marie Pierre (author), Lock, A. P. (author), Meyer, N. R. (author), de Roode, S.R. (author), de Rooy, WC (author), Sandu, I (author), Xiao, H (author), Xu, K. M. (author)Results are presented of the GASS/EUCLIPSE single-column model intercomparison study on the subtropical marine low-level cloud transition. A central goal is to establish the performance of state-of-the-art boundary-layer schemes for weather and climate models for this cloud regime, using large-eddy simulations of the same scenes as a...journal article 2017
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- Sullivan, P.P. (author), Weil, J.C. (author), Patton, E.G. (author), Jonker, H.J.J. (author), Mironov, D.V. (author) journal article 2016
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Tomas, J.M. (author), Pourquie, M.J.B.M. (author), Jonker, H.J.J. (author)Large-eddy simulations (LES) are used to investigate the effect of stable stratification on rural-to-urban roughness transitions. Smooth-wall turbulent boundary layers are subjected to a generic urban roughness consisting of cubes in an in-line arrangement. Two line sources of pollutant are added to investigate the effect on pollutant dispersion...journal article 2016
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Tomas, J.M. (author), Pourquie, M.J.B.M. (author), Jonker, H.J.J. (author)Predicting pollutant dispersion in urban environments requires accurate treatment of obstacle geometry, inflow turbulence and temperature differences. This paper considers both the influence of thermal stratification and the presence of a single obstacle on pollutant dispersion in turbulent boundary layers (TBLs). Turbulent flow over a fence...journal article 2015
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Neggers, R.A.J. (author), Siebesma, A.P. (author)This study explores the opportunities created by subjecting a system of interacting fast-acting parameterizations to long-term single-column model evaluation against multiple independent measurements at a permanent meteorological site. It is argued that constraining the system at multiple key points facilitates the tracing and identification of...journal article 2013
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Greidanus, A.J. (author), Delfos, R. (author), Westerweel, J. (author)The largest part of hydrodynamic drag during rowing, sailing or canoeing is the turbulent skin friction (80-90%). Higher velocities can be achieved by reducing the friction drag as a result of surface treatment. This research focuses on the development, characterization, and testing of drag-reducing surfaces, like nano- and micro-structured...journal article 2012
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Van Driel, R. (author), Jonker, H.J.J. (author)In this study the response of dry convective boundary layers to nonstationary surface heat fluxes is systematically investigated. This is relevant not only during sunset and sunrise but also, for example, when clouds modulate incoming solar radiation. Because the time scale of the associated change in surface heat fluxes may differ from case to...journal article 2011
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Souverein, L.J. (author)Shock wave boundary layer interactions (SWBLI) are a common phenomenon in transonic and supersonic flows. The presence of shock waves, induced by specific geometrical configurations, causes a rapid increase of the pressure, which can lead to flow separation. Examples of such interactions are found in amongst others rocket engine nozzles and on...doctoral thesis 2010
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Theunissen, R. (author)As an experimental tool, Particle Image Velocimetry has quickly superseded traditional point-wise measurements. The inherent image processing has become standardized though the performances are strongly dependent on user experience. Moreover, the arduously selected image interrogation parameters are applied uniformly throughout the image...doctoral thesis 2010
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- Hofstra, C.F. (author) conference paper 2010
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Humble, R.A. (author)A fundamental experimental study is carried out to investigate the unsteady flow organization of an incident shock wave/turbulent boundary layer interaction at Mach 2.1. Planar and tomographic particle image velocimetry (PIV) are used in combination with data processing using the proper orthogonal decomposition (POD), complemented with hot-wire...doctoral thesis 2009
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Jonker, H.J.J. (author), Heus, T. (author), Sullivan, P.P. (author)The purpose of this letter is to show that the traditional view of transport by shallow cumulus clouds needs important refinement. On the basis of a straightforward geometrical analysis of Large Eddy Simulation results of shallow cumulus clouds, we conclude (1) that the upward mass transport by clouds is strongly dominated by regions close to...journal article 2008
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Arnal, D. (author)The global objective of the SUPERTRAC project is to explore the possibilities to delay laminar-turbulent transition on supersonic aircraft wings. The following techniques are investigated: micron-sized roughness elements, anti-contamination devices, suction and shape optimization. This paper provides an overview of the project and describes in...conference paper 2006
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- Westin, K.J.A. (author), Henkes, R.A.W.M. (author) report 1996
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- Mayer, R. (author) report 1996
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- Skare, P.E. (author) report 1995
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