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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 ...
Experimental investigation of the two-phase local heat transfer coefficients for condensation of R134a in a micro-structured plate heat exchanger

Wang, Ru; Sun, Tingyan; Polzin, Anja-Elsa; Kabelac, Stephan (Berlin ; Heidelberg : Springer, 2022)

Plate heat exchangers are widely used for two-phase heat transfer in the industrial applications, and recently more attention has been paid to the plate heat exchangers with enhanced surface due to their better heat transfer ...
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 ...
It's hydrogeology but not as we know it: Sub-seafloor groundwater flow driven by thermal gradients

Desens, A.; Post, V.E.A.; Houben, G.J.; Kuhn, T.; Walther, M.; Graf, T. (Les Ulis : EDP Sciences, 2018)

Groundwater flow beneath the oceans plays an important role for cooling the earth's crust and geochemical cycles, yet it remains an understudied subject in hydrogeology. This contribution focuses on the circulation of ...
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 ...
Modeling a thermomechanical NC-simulation

Denkena, Berend; Schmidt, A.; Henjes, J.; Niederwestberg, D.; Niebuhr, C. (Amsterdam : Elsevier, 2013)

This paper presents a method for a NC-Simulation based prediction of shape errors caused by thermal expansions in machining of complex workpieces. In the first part of the paper the basic approach of modeling a thermomechanical ...
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 ...
Prediction of temperature induced shape deviations in dry milling

Denkena, Berend; Schmidt, A.; Maaß, P.; Niederwestberg, D.; Niebuhr, C.; Vehmeyer, J. (Amsterdam : Elsevier, 2015)

In this paper a model for a simulation based prediction of temperature induced shape deviations in dry milling is presented. A closed loop between Boolean material removal, process forces, heat flux and thermoelastic ...
Salinity inversions in the thermocline under upwelling favorable winds

Burchard, Hans; Basdurak, N.Berkay; Gräwe, Ulf; Knoll, Michaela; Mohrholz, Volker; Müller, Selina (Hoboken, NJ : Wiley-Blackwell Publishing, Inc., 2017)

This paper discusses and explains the phenomenon of salinity inversions in the thermocline offshore from an upwelling region during upwelling favorable winds. Using the nontidal central Baltic Sea as an easily accessible ...
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 ...
Temperature issues with white laser diodes, calculation and approach for new packages

Lachmayer, Roland; Kloppenburg, Gerolf; Stephan, Serge (Bellingham, Wash. : SPIE, 2015)

Bright white light sources are of significant importance for automotive front lighting systems. Today's upper class systems mainly use HID or LED light sources. As a further step laser diode based systems offer a high ...

Now showing items 1-12 of 12

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