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Browsing by Author "4d4d2f92-1431-4463-b494-cce73476a7b6"

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A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0

Hellsten, Antti; Ketelsen, Klaus; Sühring, Matthias; Auvinen, Mikko; Maronga, Björn; Knigge, Christoph; Barmpas, Fotios; Tsegas, Georgios; Moussiopoulos, Niolas; Raasch, Siegfried (Katlenburg-Lindau : Copernicus, 2021)

Large-eddy simulation (LES) provides a physically sound approach to study complex turbulent processes within the atmospheric boundary layer including urban boundary layer flows. However, such flow problems often involve a ...
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 ...
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 ...
A cloud microphysics parameterization for shallow cumulus clouds based on Lagrangian cloud model simulations

Noh, Yign; Oh, Donggu; Hoffmann, Fabian; Raasch, Siegfried (Boston, Massachusetts : American Meteorological Society, 2018)

Cloud microphysics parameterizations for shallow cumulus clouds are analyzed based on Lagrangian cloud model (LCM) data, focusing on autoconversion and accretion. The autoconversion and accretion rates,A and C, respectively, ...
Comparison of conventional lagrangian stochastic footprint models against les driven footprint estimates

Markkanen, T.; Steinfeld, Gerald; Kljun, N.; Raasch, Siegfried; Foken, T. (Göttingen : Copernicus GmbH, 2009)

In this study we introduce a comparison method for footprint model results by evaluating the performance of conventional Lagrangian stochastic (LS) footprint models that use parameterised flow field characteristics with ...
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 ...
Development of a new urban climate model based on the model PALM – Project overview, planned work, and first achievements

Maronga, Björn; Gross, Günther; Raasch, Siegfried; Banzhaf, Sabine; Forkel, Renate; Heldens, Wieke; Kanani-Sühring, Farah; Matzarakis, Andreas; Mauder, Matthias; Pavlik, Dirk; Pfafferott, Jens; Schubert, Sebastian; Seckmeyer, Gunther; Sieker, Heiko; Winderlich, Kristina (Stuttgart : E. Schweizerbart Science Publishers, 2019)

In this article we outline the model development planned within the joint project Model-based city planning and application in climate change (MOSAIK). The MOSAIK project is funded by the German Federal Ministry of Education ...
Development of an atmospheric chemistry model coupled to the PALM model system 6.0: Implementation and first applications

Khan, Basit; Banzhaf, Sabine; Chan, Edward C.; Forkel, Renate; Kanani-Sühring, Farah; Ketelsen, Klaus; Kurppa, Mona; Maronga, Björn; Mauder, Matthias; Raasch, Siegfried; Russo, Emmanuele; Schaap, Martijn; Sühring, Matthias (Katlenburg-Lindau : Copernicus, 2021)

In this article we describe the implementation of an online-coupled gas-phase chemistry model in the turbulence-resolving PALM model system 6.0 (formerly an abbreviation for Parallelized Large-eddy Simulation Model and now ...
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 ...
Entrainment and mixing at the interface of shallow cumulus clouds: Results from a combination of observations and simulations

Hoffmann, Fabian; Siebert, Holger; Schumacher, Jörg; Riechelmann, Theres; Katzwinkel, Jeannine; Kumar, Bipin; Götzfried, Paul; Raasch, Siegfried (Stuttgart : Gebrüder Borntraeger Verlagsbuchhandlung, 2014)

This study combines observations, large-eddy simulations (LES), and direct numerical simulations (DNS) in order to analyze entrainment and mixing in shallow cumulus clouds at all relevant spatial scales and, additionally, ...
Evaluation of large-eddy simulations forced with mesoscale model output for a multi-week period during a measurement campaign

Heinze, Rieke; Moseley, Christopher; Böske, Lennart Nils; Muppa, Shravan Kumar; Maurer, Vera; Raasch, Siegfried; Stevens, Björn (Göttingen : Copernicus GmbH, 2017)

Large-eddy simulations (LESs) of a multi-week period during the HD(CP)2 (High-Definition Clouds and Precipitation for advancing Climate Prediction) Observational Prototype Experiment (HOPE) conducted in Germany are evaluated ...
Evaluation of the dynamic core of the PALM model system 6.0 in a neutrally stratified urban environment: Comparison between les and wind-tunnel experiments

Gronemeier, Tobias; Surm, Kerstin; Harms, Frank; Leitl, Bernd; Maronga, Björn; Raasch, Siegfried (Katlenburg-Lindau : Copernicus, 2021)

We demonstrate the capability of the PALM model system version 6.0 to simulate neutrally stratified urban boundary layers. Our simulation uses the real-world building configuration of the HafenCity area in Hamburg, Germany. ...
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 ...
How Do Dust Devil-Like Vortices Depend on Model Resolution? A Grid Convergence Study Using Large-Eddy Simulation

Giersch, Sebastian; Raasch, Siegfried (Dordrecht [u.a.] : Springer Science + Business Media B.V, 2023)

Dust devils are organized convective vortices with pressure drops of hundreds of pascals that spirally lift surface material into the air. This material modifies the radiation budget by contributing to the atmospheric ...
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 ...
Improvement and development of one- and two-dimensional discrete gust models using a large-eddy simulation model

Knigge, Christoph; Raasch, Siegfried (Amsterdam : Elsevier, 2016)

High resolution large-eddy simulations (LES) were carried out to simulate the turbulent flow of the atmospheric boundary layer during an idealized strong-wind event in order to verify discrete gust models like the ...
Improving collisional growth in Lagrangian cloud models: Development and verification of a new splitting algorithm

Schwenkel, Johannes; Hoffmann, Fabian; Raasch, Siegfried (Göttingen : Copernicus GmbH, 2018)

Lagrangian cloud models (LCMs) are increasingly used in the cloud physics community. They not only enable a very detailed representation of cloud microphysics but also lack numerical errors typical for most other models. ...
Influence of turbulence on the drop growth in warm clouds, Part II: Sensitivity studies with a spectral bin microphysics and a Lagrangian cloud model

Riechelmann, Theres; Wacker, Ulrike; Beheng, Klaus D.; Etling, Dieter; Raasch, Siegfried (Stuttgart : Gebrueder Borntraeger Verlagsbuchhandlung, 2015)

Raindrops in warm clouds grow faster than predicted by classical cloud models. One of the possible reasons for this discrepancy is the influence of cloud turbulence on the coagulation process. In Part I (Siewert et al., ...
Investigation of droplet dynamics in a convective cloud using a Lagrangian cloud model

Lee, Junghwa; Noh, Yign; Raasch, Siegfried; Riechelmann, Theres; Wang, Lian-Ping (Heidelberg : Springer, 2014)

A precipitating convective cloud is simulated successfully using the Lagrangian cloud model, in which the flow field is simulated by large eddy simulation and the droplets are treated as Lagrangian particles, and the results ...

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