Auflistung nach Schlagwort "Boundary layers"

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  • Addressing the Grid-Size Sensitivity Issue in Large-Eddy Simulations of Stable Boundary Layers 
    Dai, Yi; Basu, Sukanta; Maronga, Björn; de Roode, Stephan R. (Dordrecht [u.a.] : Springer Science + Business Media B.V, 2020)
    We have identified certain fundamental limitations of a mixing-length parametrization used in a popular turbulent kinetic energy-based subgrid-scale model. Replacing this parametrization with a more physically realistic ...
  • Analysis of pressure-strain and pressure gradient-scalar covariances in cloud-topped boundary layers: A large-eddy simulation study 
    Heinze, Rieke; Mironov, Dmitrii; Raasch, Siegfried (Hoboken, NJ : Blackwell Publishing Ltd, 2016)
    A detailed analysis of the pressure-scrambling terms (i.e., the pressure-strain and pressure gradient-scalar covariances) in the Reynolds-stress and scalar-flux budgets for cloud-topped boundary layers (CTBLs) is performed ...
  • Design considerations for the electrical power supply of future civil aircraft with active high-lift systems 
    Mueller, J.-K.; Bensmann, A.; Bensmann, B.; Fischer, T.; Kadyk, T.; Narjes, G.; Kauth, F.; Ponick, B.; Seume, J.R.; Krewer, U.; Hanke-Rauschenbach, R.; Mertens, A. (Basel : MDPI AG, 2018)
    Active high-lift systems of future civil aircraft allow noise reduction and the use of shorter runways. Powering high-lift systems electrically have a strong impact on the design requirements for the electrical power supply ...
  • The Effect of Surface Heterogeneity on the Structure Parameters of Temperature and Specific Humidity: A Large-Eddy Simulation Case Study for the LITFASS-2003 Experiment 
    Maronga, Björn; Hartogensis, Oscar K.; Raasch, Siegfried; Beyrich, Frank (Berlin : Kluwer Academic Publishers, 2014)
    We conduct a high-resolution large-eddy simulation (LES) case study in order to investigate the effects of surface heterogeneity on the (local) structure parameters of potential temperature CT 2 and specific humidity Cq 2 ...
  • Effects of unstable stratification on ventilation in Hong Kong 
    Gronemeier, Tobias; Raasch, Siegfried; Ng, Edward (Basel : MDPI AG, 2017)
    Ventilation in cities is crucial for thewell being of their inhabitants. Therefore, local governments require air ventilation assessments (AVAs) prior to the construction of new buildings. In a standard AVA, however, only ...
  • An Improved Surface Boundary Condition for Large-Eddy Simulations Based on Monin–Obukhov Similarity Theory: Evaluation and Consequences for Grid Convergence in Neutral and Stable Conditions 
    Maronga, Björn; Knigge, Christoph; Raasch, Siegfried (Dordrecht : Springer Netherland, 2019)
    Monin–Obukhov similarity theory is used in large-eddy simulation (LES) models as a surface boundary condition to predict the surface shear stress and scalar fluxes based on the gradients between the surface and the first ...
  • Large eddy simulation using the general circulation model ICON 
    Dipankar, Anurag; Stevens, Björn; Heinze, Rieke; Moseley, Christopher; Zängl, Günther; Giorgetta, Marco; Brdar, Slavko (Hoboken : Blackwell Publishing Ltd, 2015)
    ICON (ICOsahedral Nonhydrostatic) is a unified modeling system for global numerical weather prediction (NWP) and climate studies. Validation of its dynamical core against a test suite for numerical weather forecasting has ...
  • Large-eddy simulations over Germany using ICON: a comprehensive evaluation 
    Heinze, Rieke; Dipankar, Anurag; Henken, Cintia Carbajal; Moseley, Christopher; Sourdeval, Odran; Trömel, Silke; Xie, Xinxin; Adamidis, Panos; Ament, Felix; Baars, Holger; Barthlott, Christian; Behrendt, Andreas; Blahak, Ulrich; Bley, Sebastian; Brdar, Slavko; Brueck, Matthias; Crewell, Susanne; Deneke, Hartwig; Di Girolamo, Paolo; Evaristo, Raquel; Fischer, Jürgen; Frank, Christopher; Friederichs, Petra; Göcke, Tobias; Gorges, Ksenia; Hande, Luke; Hanke, Moritz; Hansen, Akio; Hege, Hans-Christian; Hoose, Corinna; Jahns, Thomas; Kalthoff, Norbert; Klocke, Daniel; Kneifel, Stefan; Knippertz, Peter; Kuhn, Alexander; Laar, Thriza van; Macke, Andreas; Maurer, Vera; Mayer, Bernhard; Meyer, Catrin I.; Muppa, Shravan K.; Neggers, Roeland A.J.; Orlandi, Emiliano; Pantillon, Florian; Pospichal, Bernhard; Röber, Niklas; Scheck, Leonhard; Seifert, Axel; Seifert, Patric; Senf, Fabian; Siligam, Pavan; Simmer, Clemens; Steinke, Sandra; Stevens, Björn; Wapler, Kathrin; Weniger, Michael; Wulfmeyer, Volker; Zängl, Günther; Zhang, Dan; Quaas, Johannes (Chichester : John Wiley and Sons Ltd, 2017)
    Large-eddy simulations (LES) with the new ICOsahedral Non-hydrostatic atmosphere model (ICON) covering Germany are evaluated for four days in spring 2013 using observational data from various sources. Reference simulations ...
  • Local convection and turbulence in the Amazonia using Large Eddy Simulation model 
    Neves, Theomar; Fisch, Gilberto; Raasch, Siegfried (Basel : MDPI AG, 2018)
    Using a high resolution model of Large Eddies Simulation (LES), named PALM from PArallel LES Model, a set of simulations were performed to understand how turbulence and convection behave in a pasture and forest sites in ...
  • Meteorology and oceanography of the Atlantic sector of the Southern Ocean - a review of German achievements from the last decade 
    Hellmer, Hartmut H.; Rhein, Monika; Heinemann, Günther; Abalichin, Janna; Abouchami, Wafa; Baars, Oliver; Cubasch, Ulrich; Dethloff, Klaus; Ebner, Lars; Fahrbach, Eberhard; Frank, Martin; Gollan, Gereon; Greatbatch, Richard J.; Grieger, Jens; Gryanik, Vladimir M.; Gryschka, Micha; Hauck, Judith; Hoppema, Mario; Huhn, Oliver; Kanzow, Torsten; Koch, Boris P.; König-Langlo, Gert; Langematz, Ulrike; Leckebusch, Gregor C.; Lüpkes, Christof; Paul, Stephan; Rinke, Annette; Rost, Bjoern; Ruthers van der Loeff, Michael; Schröder, Michael; Seckmeyer, Gunther; Stichel, Torben; Strass, Volker; Timmermann, Ralph; Trimborn, Scarlett; Ulbrich, Uwe; Venchiarutti, Celia; Wacker, Ulrike; Willmes, Sascha; Wolf-Gladrow, Dieter (Berlin : Springer, 2016)
    In the early 1980s, Germany started a new era of modern Antarctic research. The Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI) was founded and important research platforms such as the German ...
  • On the Discrepancy in Simultaneous Observations of the Structure Parameter of Temperature Using Scintillometers and Unmanned Aircraft 
    Braam, Miranda; Beyrich, Frank; Bange, Jens; Platis, Andreas; Martin, Sabrina; Maronga, Björn; Moene, Arnold F. (Dordrecht : Springer Netherlands, 2016)
    We elaborate on the preliminary results presented in Beyrich et al. (in Boundary-Layer Meteorol 144:83–112, 2012), who compared the structure parameter of temperature (C2T) obtained with the unmanned meteorological mini ...
  • On the Effect of Surface Heat-Flux Heterogeneities on the Mixed-Layer-Top Entrainment 
    Sühring, Matthias; Maronga, Björn; Herbort, Florian; Raasch, Siegfried (Berlin : Kluwer Academic Publishers, 2014)
    We used a set of large-eddy simulations to investigate the effect of one-dimensional stripe-like surface heat-flux heterogeneities on mixed-layer top entrainment. The profiles of sensible heat flux and the temporal evolution ...
  • Physical properties of boundary layers in angular contact ball bearings lubricated with greases containing polymers 
    Gatzen, M.M.; Pape, F.; Poll, G.W.G. (London : SAGE Publications Ltd., 2009)
    This article describes the effect of polymer additives in lithium greases on performance and boundary layers of high-speed angular contact ball bearings. High-speed test rigs were used to run grease life tests utilizing ...
  • Scaling the Decay of Turbulence Kinetic Energy in the Free-Convective Boundary Layer 
    El Guernaoui, Omar; Reuder, Joachim; Esau, Igor; Wolf, Tobias; Maronga, Björn (Dordrecht : Springer Netherland, 2019)
    We investigate the scaling for decaying turbulence kinetic energy (TKE) in the free-convective boundary layer, from the time the surface heat flux starts decaying, until a few hours after it has vanished. We conduct a set ...
  • A spatially stabilized TDG based finite element framework for modeling biofilm growth with a multi-dimensional multi-species continuum biofilm model 
    Feng, D.; Neuweiler, Insa; Nackenhorst, Udo (Heidelberg : Springer Verlag, 2017)
    We consider a model for biofilm growth in the continuum mechanics framework, where the growth of different components of biomass is governed by a time dependent advection–reaction equation. The recently developed ...
  • Water tank experiments on stratified flow over double mountain-shaped obstacles at high-reynolds number 
    Stiperski, Ivana; Serafin, Stefano; Paci, Alexandre; Ágústsson, Halfdan; Belleudy, Anne; Calmer, Radiance; Horvath, Kristian; Knigge, Christoph; Sachsperger, Johannes; Strauss, Luke; Grubišíc, Vanda (Basel : MDPI AG, 2017)
    In this article,we present an overviewof theHyIV-CNRS-SecORo (Hydralab IV-CNRS-Secondary Orography and Rotors Experiments) laboratory experiments carried out in the CNRM (Centre National de Recherches Météorologiques) large ...