Relevant bibliographies by topics / Stratified boundary layer

Academic literature on the topic 'Stratified boundary layer'

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Published: 14 March 2023

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Journal articles on the topic "Stratified boundary layer"

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Imberger, J., and G. N. Ivey. "Boundary mixing in stratified reservoirs." Journal of Fluid Mechanics 248 (March 1993): 477–91. http://dx.doi.org/10.1017/s0022112093000850.

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We consider the steady flow driven by turbulent mixing in a benthic boundary layer along a sloping boundary in the general case of a non-uniform background density gradient. The velocity and density fields are decomposed into barotropic and baroclinic components, and a solution is obtained by taking an expansion in the small parameter A, the aspect ratio of the boundary layer defined as the thickness divided by the alongslope length. The flow in the boundary layer is governed by a balance between alongslope baroclinic and barotropic density fluxes. A number of flow regimes can exist, and we show that in the regimes relevant to lakes and reservoirs, the barotropic flow is divergent and drives an exchange flow between the boundary layer and the interior. This leads to changes in the interior density gradient which are significant when compared to field observations.
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Chimonas, George. "Substructure layers and modes in the stratified boundary layer." Dynamics of Atmospheres and Oceans 27, no. 1-4 (January 1998): 187–200. http://dx.doi.org/10.1016/s0377-0265(97)00008-0.

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RAHM, LARS, and URBAN SVENSSON. "Dispersion in a stratified benthic boundary layer." Tellus A 41A, no. 2 (March 1989): 148–61. http://dx.doi.org/10.1111/j.1600-0870.1989.tb00372.x.

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Dzhaugashtin, K. E., and A. Zh Naimanova. "Wall boundary layer in a stratified medium." Journal of Engineering Physics and Thermophysics 72, no. 2 (March 1999): 273–80. http://dx.doi.org/10.1007/bf02699150.

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Rahm, Lars, and Urban Svensson. "Dispersion in a stratified benthic boundary layer." Tellus A: Dynamic Meteorology and Oceanography 41, no. 2 (January 1989): 148–61. http://dx.doi.org/10.3402/tellusa.v41i2.11827.

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McWilliams, James C., Edward Huckle, and Alexander F. Shchepetkin. "Buoyancy Effects in a Stratified Ekman Layer." Journal of Physical Oceanography 39, no. 10 (October 1, 2009): 2581–99. http://dx.doi.org/10.1175/2009jpo4130.1.

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Abstract The K-profile parameterization scheme is used to investigate the stratified Ekman layer in a “fair weather” regime of weak mean surface heating, persistently stable density stratification, diurnal solar cycle, and broadband fluctuations in the surface stress and buoyancy flux. In the case of steady forcing, the boundary layer depth typically scales as h ∼ u*/Nf, where u* is the friction velocity, f is the Coriolis frequency, and N is the interior buoyancy frequency that confirms empirical fits. The diurnal cycle of solar forcing acts to deepen the boundary layer because of net interior absorption and compensating surface cooling. Parameterized mesoscale and submesoscale eddy-induced restratification flux compresses the boundary layer. With transient forcing, the mean boundary layer profiles are altered; that is, rectification occurs with a variety of causes and manifestations, including changes in h and in the Ekman profile u(z). Overall, stress fluctuations tend to deepen the mean boundary layer, especially near the inertial frequency. Low- and high-frequency surface buoyancy-flux fluctuations have net shallowing and deepening effects, respectively. Eddy-induced interior profile fluctuations are relatively ineffective as a source of boundary layer rectification. Rectification effects in their various combinations lead to a range of mean velocity and buoyancy profiles. In particular, they lead to a “rotated” effective eddy-viscosity profile with misalignment between the mean turbulent stress and mean shear and to a “flattening” of the velocity profile with a larger vertical scale for the current veering than the speed decay; both of these effects from rectification are consistent with previous measurements.
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THOMAS, LEIF N., and PETER B. RHINES. "Nonlinear stratified spin-up." Journal of Fluid Mechanics 473 (December 10, 2002): 211–44. http://dx.doi.org/10.1017/s0022112002002367.

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Both a weakly nonlinear analytic theory and direct numerical simulation are used to document processes involved during the spin-up of a rotating stratified fluid driven by wind-stress forcing for time periods less than a homogeneous spin-up time. The strength of the wind forcing, characterized by the Rossby number ε, is small enough (i.e. ε[Lt ]1) that a regular perturbation expansion in ε can be performed yet large enough (more specifically, ε∝E1/2, where E is the Ekman number) that higher-order effects of vertical diffusion and horizontal advection of momentum/density are comparable in magnitude. Cases of strong stratification, where the Burger number S is equal to one, with zero heat flux at the upper boundary are considered. The Ekman transport calculated to O(ε) decreases with increasing absolute vorticity. In contrast to nonlinear barotropic spin-up, vortex stretching in the interior is predominantly linear, as vertical advection negates stretching of interior relative vorticity, yet is driven by Ekman pumping modified by nonlinearity. As vertical vorticity is generated during the spin-up of the fluid, the vertical vorticity feeds back on the Ekman pumping/suction, enhancing pumping and vortex squashing while reducing suction and vortex stretching. This feedback mechanism causes anticyclonic vorticity to grow more rapidly than cyclonic vorticity. Strict application of the zero-heat-flux boundary condition leads to the growth of a diffusive thermal boundary layer E−1/4 times thicker than the Ekman layer embedded within it. In the Ekman layer, vertical diffusion of heat balances horizontal advection of temperature by extracting heat from the thermal boundary layer beneath. The flux of heat extracted from the top of the thermal boundary layer by this mechanism is proportional to the product of the Ekman transport and the horizontal gradient of the temperature at the surface. The cooling caused by this heat flux generates density inversions and intensifies lateral density gradients where the wind-stress curl is negative. These thermal gradients make the potential vorticity strongly negative, conditioning the fluid for ensuing symmetric instability which greatly modifies the spin-up process.
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Hunt, J. C. R. "Diffusion in the Stably Stratified Atmospheric Boundary Layer." Journal of Climate and Applied Meteorology 24, no. 11 (November 1985): 1187–95. http://dx.doi.org/10.1175/1520-0450(1985)024<1187:ditssa>2.0.co;2.

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Kranenburg, C. "Boundary-induced entrainment in two-layer stratified flow." Journal of Geophysical Research 92, no. C5 (1987): 5417. http://dx.doi.org/10.1029/jc092ic05p05417.

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Scotti, Alberto, and Brian White. "The Mixing Efficiency of Stratified Turbulent Boundary Layers." Journal of Physical Oceanography 46, no. 10 (October 2016): 3181–91. http://dx.doi.org/10.1175/jpo-d-16-0095.1.

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AbstractThe mixing efficiency observed in stratified turbulent boundary layers is considered within the framework of the Monin–Obukhov similarity theory. It is shown that the efficiency within the layer increases with distance from the boundary. Near the boundary, the efficiency is proportional to the distance from the boundary scaled with the Monin–Obukhov length. Far from the boundary, the efficiency relaxes to a value that depends on the overall thickness of the layer relative to the Monin–Obukhov layer. This value approaches 1/6 when the thickness is larger than 1/2 of the Monin–Obukhov length. The same analysis shows that the buoyancy Reynolds number cannot be used to unequivocally predict the efficiency. The −1/2 scaling between the efficiency and buoyancy Reynolds number that has been observed in field measurements and experiments is shown to depend on an extra dimensional scale and thus is not universal.
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Dissertations / Theses on the topic "Stratified boundary layer"

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Taylor, John R. "Numerical simulations of the stratified oceanic bottom boundary layer." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3296822.

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Thesis (Ph. D.)--University of California, San Diego, 2008.
Title from first page of PDF file (viewed March 24, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 205-212).
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Baum, Bryan Alan. "The extension of rapid distortion theory to stratified shear flows." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25971.

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Rees, J. M. "Studies of internal gravity waves in the stably stratified troposphere." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383343.

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Zhou, Jingnan. "Numerical studies of stably stratified planetary boundary-layer flows over topography and their parameterization for large scale numerical model." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq27395.pdf.

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Apsley, David D. "Numerical modelling of neutral and stably stratified flow and dispersion in complex terrain." Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/649/.

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Jiménez, Cortés Maria Antònia. "Stably stratified atmospheric boundary layer: study trough large-eddy simulations, mesoscale modelling and observations." Doctoral thesis, Universitat de les Illes Balears, 2005. http://hdl.handle.net/10803/9433.

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La capa límit atmosfèrica és l'àrea directament influenciada per la presència de la superfície de la terra i la seva alçada és d'uns centenars de metres a uns pocs quilòmetres. Durant el vespre, el refredament radiatiu estratifica establement l'aire prop del sòl i es forma el que es coneix com a Capa Límit Estable (CLE). D'avui en dia, la CLE és un règim que encara no està prou ben caracteritzat. La turbulència, que no és homogènia ni isòtropa, i la gran importància dels efectes locals com l'orografia, entre d'altres factors, dificulten l'estudi d'aquest règim. Per aquest motiu, la CLE és objecte d'especial atenció, sobretot a l'hora de millorar la seva representació en models tant de temps com de clima.

Aquest treball es centra en l'estudi de la CLE mitjançant 3 eines diferents: 1) simulacions explícites de grans remolins (més conegudes com a simulacions LES), per determinar el comportament dels moviments turbulents, on les resolucions són de l'ordre de metres; 2) simulacions mesoscalars, per caracteritzar els efectes locals, on les resolucions són de l'ordre de kilòmetres; 3) anàlisi de les observacions sota aquestes condicions per tal de caracteritzar i entendre millor els fenòmens observats.

En primer lloc s'estudia el rang d'estabilitats a on el model LES, que considera la teoria de Kolmogorov per la dissipació de l'energia, funciona correctament. Els resultats del model són realistes tal com mostra la seva comparació amb les mesures de dues campanyes experimentals (SABLES-98 i CASES-99). Per explorar més a fons els resultats LES i per comparar-los amb les mesures s'han utilitzat les Funcions de Distribució de Probabilitat (PDF). Aquests resultats LES són també comparables als obtinguts amb altres models LES, tal com mostra la intercomparació de models LES, més coneguda com a GABLS.

Un cop desenvolupades totes les eines necessàries es fa un LES d'un cas més realista, basat en les observacions d'un màxim de vent de capes baixes (més conegut com a Low-Level Jet, LLJ). L'anàlisi combinat dels resultats LES i les mesures permet entendre millor els processos de barreja que tenen lloc a través de la inversió. Finalment, la contribució dels efectes locals s'estudia mitjançant les simulacions mesoscalars, en aquest cas centrades a l'illa de Mallorca. Durant el vespre es veu com les circulacions locals es desenvolupen a les conques (de longitud al voltant de 25km), formant-se, per exemple, vents catabàtics o LLJ com l'estudiat anteriorment. En aquest cas les simulacions es verifiquen amb imatges de satèl·lit NOAA i observacions de les estacions automàtiques de mesures, donant resultats semblants.
The atmospheric boundary layer is the area directly influenced by the presence of the Earth's surface and its height is from hundreds of meters to few kilometres. During the night, the radiative cooling stratifies the layer close to the surface and it forms the Stably-stratified Atmospheric Boundary Layer (SBL). Nowadays, the SBL is a regime not well enough characterized, yet. Turbulence, which is not homogeneous either isotropic, and the great importance of the local effects, like the orography, among other factors, make the SBL be a difficult regime to study. Even so, the SBL is an object of special attention, especially when improving its representation in numerical prediction models or climate models.

This work focuses on the study of the SBL through 3 different tools: 1) Large-Eddy Simulations (LES), to determine the turbulent motions, where the resolutions are about 1m; 2) Mesoscale simulations, to characterize the local effects, where resolutions are about 1km; 3) Analysis of the observations under these conditions in order to better characterize and understand the observed phenomena.

In first place, it is studied the range of stabilities where the LES model, that considers the Kolmogorov theory for the dissipation of the energy, works correctly. The results are realistic as the comparison with measures from two experimental campaigns (SABLES-98 and CASES-99) shows. To explore the results more thoroughly, and to compare the LES results to the measurements, the Probability Density Functions (PDF) have been used. The LES results are also comparable to the ones obtained with other LES models, as the intercomparison of different LES models show, better known as GABLS.

Then, a more realistic case is performed using the LES model, based on observations of a Low-Level Jet (LLJ). The combined inspection of the LES results and the observations allow to better understand the mixing processes that take place through the inversion layer. Finally, the contribution of the local effects is studied through a mesoscale simulation. Here the attention is focused on the Mallorca Island. During the night, the model is able to reproduce the local circulations is a basin of a characteristic size of 25km. The main features obtained previously from the LES of the LLJ are also reproduced by the mesoscale model. These runs are verified with NOAA satellite images and observations from the automatic surface weather stations, giving that the model is able to reproduce realistic results.
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FRANCONE, CATERINA. "Study of the atmospheric boundary layer processes over sloping terrain covered by sparse canopy." Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2496734.

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The aim of this thesis is the study of the exchange processes at atmosphere/biosphere interface, with a particular focus on momentum and heat transport over complex terrain morphology, varying surface roughness, and a wide range of atmospheric thermal conditions. The surface roughness object of the research is a sparse canopy layer evolving in time along the vegetative season, and characterized by a multiplicity of temporal and spatial scales influencing the properties of the turbulent fluxes. Both experimental and modelling approaches characterize the study methodology. Measurements are first performed in laboratory in order to calibrate flux sensors (i.e., ultrasonic anemometers), and subsequently into three N-W Italy vineyards fields, collecting long term turbulent flux observations over the canopy. Bulk and higher order statistics are explored from these dataset to investigate the turbulent properties of the momentum and heat transfer processes. The analysis is carried out using a conventional quadrant analysis technique and is tested against two models approximating the joint probability density function of the flow variables. Because of direct measurements at field scale are too costly and time consuming, the need to more easily measured parameters for applications in the meteorological and agricultural fields has motivated the examination of a land-surface model, by performing a validation against vineyard data and a sensitivity analysis on canopy parameters. The overall results suggest an improvement procedure for the estimation of turbulent heat flux using sonic anemometers, an insight on the perturbing effect of coherent structures on gradient-diffusion theory, and the key role of canopy parameterizations in the applicative models.
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Udina, Sistach Mireia. "Modeling the atmospheric boundary layer in stably stratified conditions and over complex terrain areas: from mesoscale to LES." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/396115.

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The atmospheric boundary layer in stably-stratified conditions and over non-homogeneous terrain becomes a complex system with many interactions of physical processes occurring in a wide range of different spatial and temporal scales. During clear sky night-time or in any stably-stratified conditions intermittent turbulent events and gravity waves are usually present in the stable boundary layer (SBL), which can substantially modify the flow structure. In addition, the circulations in stable flows can be strongly driven by the underlying and surrounding topography, generating katabatic winds, density currents and low level jets, which in turn, trigger gravity waves and turbulence. This thesis aims to contribute to a better comprehension of some of the processes and phenomena occurring in the SBL and over complex terrain areas. In order to understand and quantify the unknown atmospheric processes one can distinguish three different procedures that are very well connected: theoretical descriptions, experimental campaigns and numerical modeling. The numerical models allow us to further understand the experimental data, to test the theoretical relationships or to simulate processes which are very difficult to measure. Principally, in this thesis we have used numerical models to deal with the uncertainties that arise in stably-stratified flows and over heterogeneous terrain and to explore the model capabilities and limitations to resolve them. These numerical weather prediction models (NWP) contain the primitive equations of the atmosphere to describe and forecast the flow motions and properties. In this thesis we have employed one of the worldwide known NWP model, the Weather Research and Forecasting (WRF) model, using two different approaches: the mesoscale approximation and the large eddy simulation (LES). While the mesoscale methodology has allowed us to investigate the flow circulation patterns in a wide range of scales, the LES approximation has enabled us to explicitly resolve the turbulence and describe its structure. In this thesis each methodology has been applied to investigate these different purposes. Using the WRF model with the mesoscale approach we have determined the origin of a density current that generated internal gravity waves over the "Centro de Investigaciones de la Baja Atmosfera"(CIBA) site. We have seen that the long distance mesoscale sea-breeze circulation and the night-time katabatic flows originated at the surrounding complex topography were the origin of the density current which generated displacement in the air parcels and periodic oscillations. In this thesis we have also investigated the vertical turbulence structure using the LES approximation of the WRF model. As a previous step, we have first validated the WRF-LES model in the SBL with a reference case by a comparison of the first and second order moments profiles. Using different wind speed initial conditions we reproduce neutrally and stably stratified flows. However, different from the reality, stably stratified flows are strongly coupled with the surface and turbulence is always maintained. We have shown how the turbulence intensity increases sharply with the wind speed at each height above ground but the rate of increase (slope) is not maintained, as we would expect. It seems that the the top domain potential temperature inversion affects the flow turbulence structure over the whole domain. Finally, we have studied topographically generated gravity waves over the Pyrenees and specifically simulated a trapped lee wave event using the mesoscale approximation with WRF. We have seen that the model is able to reproduce the gravity waves at the lee side of the mountain range with periodic oscillations in all magnitudes. We have seen that 1-km horizontal resolution is necessary to capture the wave field. We have also showed that upstream conditions have to be well represented to capture the adequate wave characteristics.
La capa límit atmosfèrica és la part més baixa de l'atmosfera terrestre on s'hi desenvolupa la vida humana. En condicions d'estratificació estable i sobre terreny no homogeni esdevé un sistema molt complex amb múltiples interaccions dels processos físics que hi tenen lloc. Per a entendre i quantificar algunes de les incerteses que planteja l'atmosfera a la capa límit en aquesta tesi principalment hem utilitzat eines de simulació numèrica. Els models numèrics permeten la comprensió més enllà de les dades experimentals, així com testejar les descripcions teòriques, a més de simular fenòmens que són molt difícils de mesurar. L'objectiu és, doncs, contribuir a la comprensió dels fenòmens que tenen lloc a la capa límit en condicions d'estratificació estable i sobre àrees de terreny complex i explorar les capacitats i les limitacions de la seva modelització numèrica. D'entre els principals resultats, fent ús del model WRF en l'aproximació de mesoscala, hem determinat l'origen d'una corrent de densitat que va donar lloc a ones de gravetat interna en la zona del Centro de Investigaciones de la Baja Atmósfera (CIBA). Hem vist que una massa d'aire amb origen de brisa marítima juntament amb els vents catabàtics originats a les cadenes muntanyoses del voltant són l'origen de la corrent de densitat que genera ones de gravetat al seu pas per l'àrea del CIBA. Per altra banda, hem explorat l'estructura vertical de la turbulència en condicions neutrals i estables fent ús del model WRF en l'aproximació LES (WRF-LES). S'han investigat els règims de intensitat de turbulència en funció de la velocitat del vent i s'ha obtingut una relació semblant a les observacions en situació de forta turbulència. Veiem les condicions de contorn del model a la superfície i al límit superior poden afectar molt significativament l'estructura dels remolins. Finalment, l'estudi de les ones de muntanya sobre la orografia complexa del Pirineu amb el model WRF en el mode mesoscalar ha permès avaluar la capacitat del model per a representar l'esdeveniment i la variació en els resultats en funció de les seves diferents opcions físiques i de configuració.
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Mirocha, Jeffrey D. "An investigation of the stably-stratified atmospheric boundary layer over the Arctic Ocean during stable, clear-sky, winter conditions." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3186935.

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Marti, Clelia Luisa. "Exchange processes between littoral and pelagic waters in a stratified lake." University of Western Australia. Centre for Water Research, 2004. http://theses.library.uwa.edu.au/adt-WU2005.0005.

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[Truncated abstract] The lake boundaries are an important source of sediment, nutrients and chemicals. For life inside the lake, the exchange between the lake boundaries (littoral) and lake interior (pelagic) is of central importance to Limnology as the net flux of nutrients into the water column is both the driving force and limiting factor for most algae blooms found during the stratification period. Consequently, the understanding of the relevant processes defining such an exchange is a further step toward a sound basis for future decisions by lake managers in order to ensure high water quality. The objective of this research was to investigate the physical processes responsible for the exchange of water and particles between the lake boundaries and the lake interior. An integrated approach using field experiments and 3D modelling as applied to Lake Kinneret (Israel) is presented. The field data revealed large-scale metalimnion oscillations with amplitudes up to 10 m in response to westerly diurnal winds, the existence of a well-defined suspended particle intrusion into the metalimnion of the lake, characterized by high concentrations of organic matter, and a well-mixed benthic boundary layer (BBL). The changes in the thermal structure explained the observed vertical and horizontal movements of the suspended particle intrusion. The horizontal advective transport via the metalimnion, associated with the velocities induced by the basin-scale mode-two Poincare wave, controlled the exchange between the lake boundaries and lake interior on daily time scales. The observed BBL over the lake slope varied markedly with time and space. Detailed comparison of simulation results with field data revealed that the model captured the lake hydrodynamics for time scales from hours to days. The model could then be used to extract the residual motions in the various regions of the lake. The residual motions below the surface layer were predominantly forced by the basin-scale internal wave motions, but the residual motion in the surface layer was found to be very sensitive to the curl of the wind field. The residual circulation was responsible for redistributing mass throughout the lake basin on time scales from days to weeks. A clear connection of dynamics of the BBL with the large-scale features of the flow was addressed. The time history of the mixing in the BBL and the resulting cross-shore flux was shown to vary with the phase of the basin-scale internal waves.
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Books on the topic "Stratified boundary layer"

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P, Castro I., Rockliff N. J, and Institute of Mathematics and Its Applications., eds. Stably stratified flows: Flow and dispersion over topography : based on the proceedings of the Fourth Conference on Stably Stratified Flows, organized by the Institute of Mathematics and Its Applications and held at the University of Surrey in September, 1992. Oxford: Clarendon Press, 1994.

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Ansorge, Cedrick. Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-45044-5.

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Koba, Hajime. Nonlinear stability of Ekman boundary layers in rotation stratified fluids. Providence, Rhode Island: American Mathematical Society, 2013.

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Blackaby, Nicholas D. Inviscid vortex motions in weakly three-dimensional boundary layers and their relation with instabilities in stratified shear flows. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1992.

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Blackaby, Nicholas D. Inviscid vortex motions in weakly three-dimensional boundary layers and their relation with instabilities in stratified shear flows. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1992.

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Ansorge, Cedrick. Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer. Springer, 2016.

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Ansorge, Cedrick. Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer. Springer, 2018.

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Ruscher, Paul Harold. An examination of structure and parameterization of turbulence in the stably-stratified atmospheric boundary layer. 1987.

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(Editor), I. P. Castro, and N. J. Rockliff (Editor), eds. Stably Stratified Flows: Flow and Dispersion over Topography (Institute of Mathematics and Its Applications Conference Series New Series). Oxford University Press, USA, 1994.

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Book chapters on the topic "Stratified boundary layer"

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Azad, Ram S. "Basics of Usual Turbulent Boundary Layer; Neutrally Stratified Atmospheric Boundary Layer." In The Atmospheric Boundary Layer for Engineers, 297–382. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1785-2_6.

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Ansorge, Cedrick. "The Neutrally Stratified Ekman Layer." In Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer, 75–95. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45044-5_6.

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Garratt, J. R., and B. F. Ryan. "The Structure of the Stably Stratified Internal Boundary Layer in Offshore Flow over the Sea." In Boundary Layer Studies and Applications, 17–40. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0975-5_3.

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Lenschow, Donald H., Xing Sheng Li, Cui Juan Zhu, and B. Boba Stankov. "The Stably Stratified Boundary Layer over the Great Plains." In Topics in Micrometeorology. A Festschrift for Arch Dyer, 95–121. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2935-7_8.

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Lenschow, Donald H., Shi F. Zhang, and B. Boba Stankov. "The Stably Stratified Boundary Layer over the Great Plains." In Topics in Micrometeorology. A Festschrift for Arch Dyer, 123–35. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2935-7_9.

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Miyashita, Katsuhiro, Kaoru Iwamoto, and Hiroshi Kawamura. "Direct Numerical Simulation of Neutrally Stratified Ekman Boundary Layer." In Frontiers of Computational Science, 227–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-46375-7_30.

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Cowan, I. R., and R. E. Britter. "Direct Numerical Simulation of a Stably Stratified Turbulent Boundary Layer." In Direct and Large-Eddy Simulation I, 157–66. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1000-6_14.

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Ansorge, Cedrick. "Implications for the Study of the Atmospheric Boundary Layer." In Analyses of Turbulence in the Neutrally and Stably Stratified Planetary Boundary Layer, 143–50. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45044-5_9.

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Perestenko, Oleg V., and Lev Kh Ingel. "On an Instability Mechanism in a Stably Stratified Atmospheric Layer over a Moistened Surface." In Boundary-Layer Meteorology 25th Anniversary Volume, 1970–1995, 383–98. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-017-0944-6_16.

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Leroux, Karine, and Olivier Eiff. "Boundary-Layer Influence on Extreme Events in Stratified Flows over Orography." In Wind Energy, 105–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-33866-6_18.

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Conference papers on the topic "Stratified boundary layer"

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Cataldi, Marcio, Juliana B. R. Loureiro, and Atila P. Silva Freire. "A Wind-Tunnel Study of Thermally Stratified Boundary Layers." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32963.

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The objective of this work is to develop, in a wind tunnel environment, boundary layers with different states of development that simulate the structure present in the atmospheric boundary layer. The work analyses the dymamic and thermal characteristics of different types of thick, artificially-generated, turbulent boundary layers. The thermal boundary layer is obtained by two methods: wall surface heating, made through electrical resistance, can furnish an increase in wall temperature of up to 100 °C above the ambient temparatures and can be applied over a 5000 mm long surface with a controlled variation of 2 °C. The main flow heating is obtained by forcing the flow pass through an array of copper wires whose elements can be heated individually. The main flow can be heated up to 100 °C. The whole system can then be used to produce unstable, neutral and stable boundary layers. The parameters of the thermal boundary layers are qualified according to the following parameters: growth, structure, equilibrium, turbulent transport of heat and energy spectrum. The paper describes in detail the experimental arrangements, including the geometry of the wind tunnel and the instrumentation.
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Sutherland, B. R., and D. A. Aguilar. "Stratified flow over topography: wave generation and boundary layer separation." In ADVANCES IN FLUID MECHANICS 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/afm06032.

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Merzari, Elia, Paul Fischer, W. David Pointer, Marco Pellegrini, and Hisashi Ninokata. "On the Interaction of Boundary Layer and Mixing Layer in Stratified Pipe Flow." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72387.

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Stratified pipe flow in a pipe has been the subject of several investigations over the years. In fact it is relevant to the operation of thermal energy systems involving significant temperature gradients and low flow conditions. Stratification affects mixing, and is one the key phenomena that need to be addressed in the design of any mixing system of devices involving significant density difference. In order for thermal stratification in a pipe to be correctly modeled the underlying hydrodynamic behavior related to the mixing of two streams in a pipe needs to be fully understood. The present paper deals with the numerical simulation of the flow in a pipe where the bottom half has a lower velocity compared to the upper half. A turbulent mixing layer develops in the streamwise direction at the interface between low flow region and higher flow region. Since the Reynolds number is low, the boundary layer and the mixing layer are about the same size. This translates in non trivial interactions between the structures in the boundary layer and the mixing layer. The failure of RANS models in accounting for the mixing points in this direction. An LES of the flow in this geometry has been performed with the spectral code Nek5000. The averaged statistics have been compared with available experimental results. Proper Orthogonal Decomposition has been applied to clarify outstanding issues in RANS modeling.
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Kurbatskaya, L. I. "FEATURES OF TURBULENT TRANSPORT IN THE STABLY STRATIFIED BOUNDARY LAYER ATMOSPHERE." In ХХI International Conference on the Methods of Aerophysical Research (ICMAR 2022). Novosibirsk: Федеральное государственное бюджетное учреждение «Сибирское отделение Российской академии наук», 2022. http://dx.doi.org/10.53954/9785604788967_108.

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Hattori, H., S. Yoshikawa, T. Houra, M. Tagawa, and Yasutaka Nagano. "DNS of thermally-stratified turbulent boundary layer over 2-dimensional hill." In THMT-12. Proceedings of the Seventh International Symposium On Turbulence, Heat and Mass Transfer Palermo, Italy, 24-27 September, 2012. Connecticut: Begellhouse, 2012. http://dx.doi.org/10.1615/ichmt.2012.procsevintsympturbheattransfpal.2600.

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Hattori, H., and Y. Nagano. "DNS and Turbulence Modeling for Turbulent Boundary Layers With Various Thermal Stratifications." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32586.

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Direct numerical simulations (DNS) of boundary layers with various thermal stratifications are carried out to investigate the turbulent structures of these flows. The present DNSs quantitatively provide the characteristics of thermally stratified turbulent boundary layers. In particular, the counter gradient diffusion phenomenon is found in a strong, stable stratified boundary layer. On the other hand, in order to adequately predict turbulent boundary layers with various thermal stratifications, an appropriate turbulence model should be employed in the calculation. Thus, using a database obtained by DNS, the strict assessment of turbulent heat transfer model is made so as to construct a reliable advanced turbulence model. The results of in-depth turbulent model evaluation are indicated, in which we have explored the prediction potential of the proposed nonlinear eddy diffusivity models for momentum and heat in both stable and unstable stratified boundary layers.
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Haywood, John, and Adrian Sescu. "Large Eddy Simulation Study of Moving Objects in Thermally-Stratified Boundary Layer Flows." In 22nd AIAA Computational Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-2299.

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Hewitt, Richard E., Peter W. Duck, Michael R. Foster, and Peter A. Davis. "Nonlinear Spin-Up of a Rotating Stratified Fluid: Theory." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1242.

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Abstract We consider the boundary layer that forms on the wall of a rotating container of stratified fluid when altered from an initial state of rigid body rotation. The container is taken to have a simple axisymmetric form with sloping walls. The introduction of a non-normal component of buoyancy into the velocity boundary-layer is shown to have a considerable effect for certain geometries. We introduce a similarity-type solution and solve the resulting unsteady boundary-layer equations numerically for three distinct classes of container geometry. Computational and asymptotic results are presented for a number of parameter values. By mapping the parameter space we show that the system may evolve to either a steady state, a double-structured growing boundary-layer, or a finite-time breakdown depending on the container type, rotation change and stratification. In addition to extending the results of Duck, Foster & Hewitt (1997) to a more general container shape, we present evidence of a new finite-time breakdown associated with higher Schmidt/Prandtl numbers.
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Kamardin, Andrey, Vladimir Gladkikh, Vladimir Mamyshev, Irina V. Nevzorova, Sergey Odintsov, and Ioann Trofimov. "Estimation of the height of intense turbulent heat exchange layer in the stably stratified atmospheric boundary layer." In 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, edited by Gennadii G. Matvienko and Oleg A. Romanovskii. SPIE, 2020. http://dx.doi.org/10.1117/12.2574268.

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Tamura, Toshihiko, J. Nagayama, K. Ohta, K. Mori, and A. Okuno. "LES of Spatially-developing Thermally Stratified Turbulent Boundary Layer over Uniformly Arrayed Roughness Elements." In Turbulence, Heat and Mass Transfer 5. Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer. New York: Begellhouse, 2006. http://dx.doi.org/10.1615/ichmt.2006.turbulheatmasstransf.1000.

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Reports on the topic "Stratified boundary layer"

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Galperin, B., S. Sukoriansky, V. Perov, and S. Zilitinkevich. Improved Parameterization of Stably Stratified Boundary Layer Turbulence in Atmospheric Models. Fort Belvoir, VA: Defense Technical Information Center, March 2005. http://dx.doi.org/10.21236/ada431687.

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