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Browsing by Subject "Large eddy simulation"

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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 ...
Assessment of Surface-Layer Coherent Structure Detection in Dual-Doppler Lidar Data Based on Virtual Measurements

Stawiarski, Christina; Träumner, Katja; Kottmeier, Christoph; Knigge, Christoph; Raasch, Siegfried (Berlin : Kluwer Academic Publishers, 2015)

Dual-Doppler lidar has become a useful tool to investigate the wind-field structure in two-dimensional planes. However, lidar pulse width and scan duration entail significant and complex averaging in the resulting retrieved ...
Derivation of Structure Parameters of Temperature and Humidity in the Convective Boundary Layer from Large-Eddy Simulations and Implications for the Interpretation of Scintillometer Observations

Maronga, Björn; Moene, Arnold F.; van Dinther, Danielle; Raasch, Siegfried; Bosveld, Fred C.; Gioli, Beniamino (Heidelberg : Springer Verlag, 2013)

We derive the turbulent structure parameters of temperature CT 2 and humidity Cq 2 from high-resolution large-eddy simulations (LES) of a homogeneously-heated convective boundary layer. Boundary conditions and model forcing ...
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 ...
Heterogeneity-Induced Heat-Flux Patterns in the Convective Boundary Layer: Can they be Detected from Observations and is There a Blending Height? - A Large-Eddy Simulation Study for the LITFASS-2003 Experiment

Sühring, Matthias; Raasch, Siegfried (Heidelberg : Springer Verlag, 2013)

An understanding of how the convective boundary layer (CBL) is mixed under heterogeneous surface forcing is crucial for the interpretation of area-averaged turbulence measurements. To determine the height and degree to ...
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 ...
Influence of langmuir circulation on the deepening of the wind-mixed layer

Noh, Y.; Goh, G.; Raasch, S. (Boston, Massachusetts : American Meteorological Society, 2011)

Analysis of large eddy simulation data reveals that Langmuir circulation (LC) induces a significant enhancement of the mixed layer deepening, only if the mixed layer depth (MLD) h is shallow and the buoyancy jump across ...
Large eddy simulation of the ocean mixed layer: The effects of wave breaking and langmuir circulation

Noh, Y.; Min, H.S.; Raasch, Siegfried (Boston, Massachusetts : American Meteorological Society, 2004)

Large eddy simulation (LES) of the ocean mixed layer was performed in which both wave breaking and Langmuir circulation are realized. Wave breaking was represented by random forcing consistent with the observed near-surface ...
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 simulation of radiation fog with comprehensive two-moment bulk microphysics: Impact of different aerosol activation and condensation parameterizations

Schwenkel, Johannes; Maronga, Björn (Göttingen : Copernicus GmbH, 2018)

In this paper we study the influence of the cloud microphysical parameterization on large-eddy simulations of radiation fog. A deep fog case as observed at Cabauw (Netherlands) is investigated using high-resolution large-eddy ...
Large-Eddy Simulations of Surface Heterogeneity Effects on the Convective Boundary Layer During the LITFASS-2003 Experiment

Maronga, Björn; Raasch, Siegfried (Heidelberg : Springer Verlag, 2013)

We investigate the impact of observed surface heterogeneities during the LITFASS-2003 experiment on the convective boundary layer (CBL). Large-eddy simulations (LES), driven by observed near-surface sensible and latent ...
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 ...
Numerical studies of the melting process in the induction furnace with cold crucible

Umbrasko, A.; Baake, E.; Nacke, B.; Jakovics, A. (Bingley : Emerald Group Publishing Ltd., 2008)

Purpose - Aims to present recent activities in numerical modeling of cold crucible melting process. Design/methodology/approach - 3D numerical analysis was used for electromagnetic problem and 3D large eddy simulation (LES) ...
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 ...
On the effects of lateral openings on courtyard ventilation and pollution - A large-eddy simulation study

Gronemeier, Tobias; Sühring, Matthias (Basel : MDPI AG, 2019)

Courtyards are an omnipresent feature within the urban environment. Residents often use courtyards as recreation areas, which makes them crucial for the physical and psychological comfort of the urban population. However, ...
Particle transport in recirculated liquid metal flows

Kirpo, M.; Jakovičs, A.; Nacke, B.; Baake, E. (Bingley : Emerald Group Publishing Ltd., 2008)

Purpose - Aims to present recent activities in numerical modeling of turbulent transport processes in induction crucible furnace. Design/methodology/approach - 3D large eddy simulation (LES) method was applied for fluid ...
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 ...
Urban climate under change [UC]2 - A national research programme for developing a building-resolving atmospheric model for entire city regions

Scherer, Dieter; Antretter, Floran; Bender, Steffen; Cortekar, Jörg; Emeis, Stefan; Fehrenbach, Ute; Gross, Günter; Halbig, Guido; Hasse, Jens; Maronga, Björn; Raasch, Siegfried; Scherber, Katharina (Stuttgart : Gebrueder Borntraeger Verlagsbuchhandlung, 2019)

Large cities and urban regions are confronted with rising pressure by environmental pollution, impacts of climate change, as well as natural and health hazards. They are characterised by heterogeneous mosaics of urban ...

Now showing items 1-20 of 22

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Browsing by Subject "Large eddy simulation"

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