Large Eddy Simulation Of Stratocumulus Topped Atmospheric Boundary Layers With Dynamic Subgrid Scale Models

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Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721631490
Total Pages : 26 pages
Book Rating : 4.6/5 (314 download)

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Book Synopsis Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models by : National Aeronautics and Space Administration (NASA)

Download or read book Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the present study is to evaluate the dynamic procedure in LES of stratocumulus topped atmospheric boundary layer and assess the relative importance of subgrid-scale modeling, cloud microphysics and radiation modeling on the predictions. The simulations will also be used to gain insight into the processes leading to cloud top entrainment instability and cloud breakup. In this report we document the governing equations, numerical schemes and physical models that are employed in the Goddard Cumulus Ensemble model (GCEM3D). We also present the subgrid-scale dynamic procedures that have been implemented in the GCEM3D code for the purpose of the present study. Senocak, Inane Ames Research Center

Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models

Author : Inanc Senocak
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (742 download)

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Book Synopsis Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models by : Inanc Senocak

Download or read book Large-Eddy Simulation of Stratocumulus-Topped Atmospheric Boundary Layers with Dynamic Subgrid-Scale Models written by Inanc Senocak and published by . This book was released on 2003 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth's climate and its geographical variation is strongly influenced by cloud coverage. It is estimated that about 50% of the earth is covered by clouds at any given time, providing a shield from solar radiation. Radiative energy transfer and its interaction with clouds play an important role in the thermal structure and stratification of the atmosphere. For instance, clouds have high reflectivity in the visible wavelengths, thus providing relative cooling of the atmosphere. They also absorb strongly in the infrared wavelengths, resulting in heating of the atmosphere (Salby 1996).

Large-eddy Simulation of Stably Stratified Atmospheric Boundary Layer Turbulence

Author : Sukanta Basu
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Large-eddy Simulation of Stably Stratified Atmospheric Boundary Layer Turbulence by : Sukanta Basu

Download or read book Large-eddy Simulation of Stably Stratified Atmospheric Boundary Layer Turbulence written by Sukanta Basu and published by . This book was released on 2004 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Subgrid-scale Turbulence Modeling for Improved Large-eddy Simulation of the Atmospheric Boundary Layer

Author : Rica Mae Enriquez
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (839 download)

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Book Synopsis Subgrid-scale Turbulence Modeling for Improved Large-eddy Simulation of the Atmospheric Boundary Layer by : Rica Mae Enriquez

Download or read book Subgrid-scale Turbulence Modeling for Improved Large-eddy Simulation of the Atmospheric Boundary Layer written by Rica Mae Enriquez and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Large-eddy simulation (LES), as the name suggests, resolves the large eddies in the flow while modeling the effects of smaller motions (turbulence) on those larger eddies. Powerful computers make LES increasingly practical for analyzing a variety of atmospheric behavior in more detail, creating a need for more realistic turbulence models. Advances in describing atmospheric turbulence can impact many disciplines, e.g., weather and climate prediction, wind energy production, ocean dynamics, and, indeed, even computational fluid dynamics itself. Although the turbulence model can significantly affect the accuracy of the LES, simple turbulence models, which are known to be less accurate, are widely used. As an alternative, the Generalized Linear Algebraic Subgrid-Scale (GLASS) model, that actively couples momentum and heat transport, was developed. This model is more complete than conventional LES turbulence models because it accounts for additional transport processes. GLASS includes production, dissipation, pressure redistribution, and buoyancy terms. With the inclusion of an actively coupled turbulent heat flux model, GLASS is applicable to a range of atmospheric stability conditions for the unsaturated atmosphere. LES at various resolutions in a neutrally stratified boundary layer flow indicated that the GLASS model is a more physically complete subgrid-scale turbulence model that provides near-wall anisotropies and yields proper velocity profiles in the logarithmic layer. LES of the moderately convective boundary layer demonstrated that GLASS predicted the evolution of resolved quantities at least as well as the LESs with simple models, while including additional physics. Additional simulations of the stable boundary layer and the transitioning boundary layer highlight that GLASS can be applied to various stability conditions without the need of tuning model coefficients.

ספר מגלה עמוקות

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (233 download)

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Book Synopsis ספר מגלה עמוקות by :

Download or read book ספר מגלה עמוקות written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Large Eddy Simulation of a Nocturnal Stratocumulus Topped Marine Atmospheric Boundary Layer

Author : Andreas Chlond
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (245 download)

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Book Synopsis Large Eddy Simulation of a Nocturnal Stratocumulus Topped Marine Atmospheric Boundary Layer by : Andreas Chlond

Download or read book Large Eddy Simulation of a Nocturnal Stratocumulus Topped Marine Atmospheric Boundary Layer written by Andreas Chlond and published by . This book was released on 1999 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Large-eddy Simulation of the Development of Stably-stratified Atmospheric Boundary Layers Over Cool Flat Surfaces

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (88 download)

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Book Synopsis Large-eddy Simulation of the Development of Stably-stratified Atmospheric Boundary Layers Over Cool Flat Surfaces by :

Download or read book Large-eddy Simulation of the Development of Stably-stratified Atmospheric Boundary Layers Over Cool Flat Surfaces written by and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stable boundary layer (SBL) has received less attention in atmospheric field studies, laboratory experiments, and numerical modeling than other states of the atmospheric boundary layer. The low intensity and potential intermittency of turbulence in the SBL make it difficult to measure and characterize its structure. Large-eddy simulation (LES) offers an approach for simulating the SBL and, in particular, its evolution from the onset of surface cooling. Traditional approaches that involve Reynolds-averaged models of turbulence are not able to simulate the stochastic nature of the intermittent turbulence that is associated with the SBL. LES shows promise in this area through its explicit calculation of turbulent eddies at resolved scales. In the LES approach, the Navier-Stokes equations governing the flow are averaged (filtered) over some small interval, such as one or more cells of the computational grid. The grid size is small enough so that large eddies, which carry most of the turbulent energy, are explicitly calculated. The turbulence associated with the subgrid-scale (SGS) eddies is modeled. In the Reynolds-averaging approach, on the other hand, the turbulence model must account for all scales of turbulence. Thus the advantage of LES is that the choice of turbulence parameterization for the SGS turbulence is not nearly as critical as in the Reynolds-averaged approach. Complications faced by turbulence models, such as anisotropy and pressure-strain correlations, are associated mainly with large, energy-containing eddies. LES offers the potential for more realistic simulations since the more complicated features of turbulence are calculated explicitly. The ability of LES to simulate the stochastic behavior of turbulence makes this approach suitable for developing and testing stochastic models of turbulent diffusion. One of the goals of the present work is to provide stochastic datasets to be used in such studies.

Shallow Clouds, Water Vapor, Circulation, and Climate Sensitivity

Author : Robert Pincus
Publisher : Springer
ISBN 13 : 3319772732
Total Pages : 396 pages
Book Rating : 4.3/5 (197 download)

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Book Synopsis Shallow Clouds, Water Vapor, Circulation, and Climate Sensitivity by : Robert Pincus

Download or read book Shallow Clouds, Water Vapor, Circulation, and Climate Sensitivity written by Robert Pincus and published by Springer. This book was released on 2018-05-29 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a series of overview articles arising from a workshop exploring the links among shallow clouds, water vapor, circulation, and climate sensitivity. It provides a state-of-the art synthesis of understanding about the coupling of clouds and water vapor to the large-scale circulation. The emphasis is on two phenomena, namely the self-aggregation of deep convection and interactions between low clouds and the large-scale environment, with direct links to the sensitivity of climate to radiative perturbations. Each subject is approached using simulations, observations, and synthesizing theory; particular attention is paid to opportunities offered by new remote-sensing technologies, some still prospective. The collection provides a thorough grounding in topics representing one of the World Climate Research Program’s Grand Challenges. Previously published in Surveys in Geophysics, Volume 38, Issue 6, 2017 The aritcles “Observing Convective Aggregation”, “An Observational View of Relationships Between Moisture Aggregation, Cloud, and Radiative Heating Profiles”, “Implications of Warm Rain in Shallow Cumulus and Congestus Clouds for Large-Scale Circulations”, “A Survey of Precipitation-Induced Atmospheric Cold Pools over Oceans and Their Interactions with the Larger-Scale Environment”, “Low-Cloud Feedbacks from Cloud-Controlling Factors: A Review”, “Mechanisms and Model Diversity of Trade-Wind Shallow Cumulus Cloud Feedbacks: A Review”, “Structure and Dynamical Influence of Water Vapor in the Lower Tropical Troposphere”, “Emerging Technologies and Synergies for Airborne and Space-Based Measurements of Water Vapor Profiles”, “Observational Constraints on Cloud Feedbacks: The Role of Active Satellite Sensors”, and “EUREC4A: A Field Campaign to Elucidate the Couplings Between Clouds, Convection and Circulation” are available as open access articles under a CC BY 4.0 license at link.springer.com.

Mixed-layer Models and Large-eddy Simulations of Stratocumulus-topped Marine Boundary Layers

Author : Junya Uchida
Publisher :
ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.:/5 (79 download)

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Book Synopsis Mixed-layer Models and Large-eddy Simulations of Stratocumulus-topped Marine Boundary Layers by : Junya Uchida

Download or read book Mixed-layer Models and Large-eddy Simulations of Stratocumulus-topped Marine Boundary Layers written by Junya Uchida and published by . This book was released on 2010 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Large-eddy Simulation of Laminar-turbulent Breakdown at High Speeds with Dynamic Subgrid-scale Modeling

Author : Nabil M. El-Hady
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Large-eddy Simulation of Laminar-turbulent Breakdown at High Speeds with Dynamic Subgrid-scale Modeling by : Nabil M. El-Hady

Download or read book Large-eddy Simulation of Laminar-turbulent Breakdown at High Speeds with Dynamic Subgrid-scale Modeling written by Nabil M. El-Hady and published by . This book was released on 1993 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Large Eddy Simulations of Stratocumulus-topped Boundary Layers

Author : Wing Yee Hester Leung
Publisher :
ISBN 13 : 9789176492727
Total Pages : 36 pages
Book Rating : 4.4/5 (927 download)

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Book Synopsis Large Eddy Simulations of Stratocumulus-topped Boundary Layers by : Wing Yee Hester Leung

Download or read book Large Eddy Simulations of Stratocumulus-topped Boundary Layers written by Wing Yee Hester Leung and published by . This book was released on 2015 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Large-Eddy Simulation of Laminar-Turbulent Breakdown at High Speeds with Dynamic Subgrid-Scale Modeling

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722611972
Total Pages : 60 pages
Book Rating : 4.6/5 (119 download)

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Book Synopsis Large-Eddy Simulation of Laminar-Turbulent Breakdown at High Speeds with Dynamic Subgrid-Scale Modeling by : National Aeronautics and Space Administration (NASA)

Download or read book Large-Eddy Simulation of Laminar-Turbulent Breakdown at High Speeds with Dynamic Subgrid-Scale Modeling written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The laminar-turbulent breakdown of a boundary-layer flow along a hollow cylinder at Mach 4.5 is investigated with large-eddy simulation. The subgrid scales are modeled dynamically, where the model coefficients are determined from the local resolved field. The behavior of the dynamic-model coefficients is investigated through both an a priori test with direct numerical simulation data for the same case and a complete large-eddy simulation. Both formulations proposed by Germano et al. and Lilly are used for the determination of unique coefficients for the dynamic model and their results are compared and assessed. The behavior and the energy cascade of the subgrid-scale field structure are investigated at various stages of the transition process. The investigations are able to duplicate a high-speed transition phenomenon observed in experiments and explained only recently by the direct numerical simulations of Pruett and Zang, which is the appearance of 'rope-like' waves. The nonlinear evolution and breakdown of the laminar boundary layer and the structure of the flow field during the transition process were also investigated. El-Hady, Nabil M. Unspecified Center...

Large-eddy Simulation of Stratocumulus-topped Boundary Layer with an Explicit and a New Bulk Microphysics Scheme

Author : Marat Khairoutdinov
Publisher :
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.:/5 (434 download)

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Book Synopsis Large-eddy Simulation of Stratocumulus-topped Boundary Layer with an Explicit and a New Bulk Microphysics Scheme by : Marat Khairoutdinov

Download or read book Large-eddy Simulation of Stratocumulus-topped Boundary Layer with an Explicit and a New Bulk Microphysics Scheme written by Marat Khairoutdinov and published by . This book was released on 1997 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Atmospheric Boundary Layer

Author : J. R. Garratt
Publisher : Cambridge University Press
ISBN 13 : 9780521467452
Total Pages : 340 pages
Book Rating : 4.4/5 (674 download)

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Book Synopsis The Atmospheric Boundary Layer by : J. R. Garratt

Download or read book The Atmospheric Boundary Layer written by J. R. Garratt and published by Cambridge University Press. This book was released on 1994-04-21 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a comprehensive and lucid account of the science of the atmospheric boundary layer (ABL). There is an emphasis on the application of the ABL to numerical modelling of the climate. The book comprises nine chapters, several appendices (data tables, information sources, physical constants) and an extensive reference list. Chapter 1 serves as an introduction, with chapters 2 and 3 dealing with the development of mean and turbulence equations, and the many scaling laws and theories that are the cornerstone of any serious ABL treatment. Modelling of the ABL is crucially dependent for its realism on the surface boundary conditions, and chapters 4 and 5 deal with aerodynamic and energy considerations, with attention to both dry and wet land surfaces and sea. The structure of the clear-sky, thermally stratified ABL is treated in chapter 6, including the convective and stable cases over homogeneous land, the marine ABL and the internal boundary layer at the coastline. Chapter 7 then extends the discussion to the cloudy ABL. This is seen as particularly relevant, since the extensive stratocumulus regions over the subtropical oceans and stratus regions over the Arctic are now identified as key players in the climate system. Finally, chapters 8 and 9 bring much of the book's material together in a discussion of appropriate ABL and surface parameterization schemes in general circulation models of the atmosphere that are being used for climate simulation.

Small Scale Processes and Entrainment in a Stratocumulus Marine Boundary Layer

Author :
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (684 download)

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Book Synopsis Small Scale Processes and Entrainment in a Stratocumulus Marine Boundary Layer by :

Download or read book Small Scale Processes and Entrainment in a Stratocumulus Marine Boundary Layer written by and published by . This book was released on 1998 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lack of resolution is a common problem hampering the use of large eddy simulation models for investigating boundary layer dynamics. Entrainment into the tops of marine stratus is characteristic of this problem. The use of parallel computing as a technique for resolving both boundary layer motions and the entrainment region enables the investigation of the interaction between the moist thermodynamics and turbulence in the entrainment region at very small length scales (dx = 8 m, dz = 4 m). This interaction results in heterogeneity at small scales which is important for correctly diagnosing the details of entrainment. This study presents several numerical experiments at high resolution using a generalization of a 1995 GCSS (GEWEX Cloud System Studies) model intercomparison. Subtle details of the numerical algorithm are found to cause larger differences in entrainment than choice of subgrid model. A kinetic energy budget shows that even for very high resolution, numerical dissipation is usually larger than that produced by the subgrid model. However, the structure of eddies at the inversion is determined mainly by resolution with very little dependence on numerical representation. Inversion properties are converging as resolution approaches an undulation scale. Most of the mixing is confined within 100 meters of the inversion with entraining motions having an aspect ratio of 6 to 1.

Structure of the Atmospheric Boundary Layer

Author : Zbigniew Sorbjan
Publisher :
ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Structure of the Atmospheric Boundary Layer by : Zbigniew Sorbjan

Download or read book Structure of the Atmospheric Boundary Layer written by Zbigniew Sorbjan and published by . This book was released on 1989 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Atmosphere and Climate of Mars

Author : Robert M. Haberle
Publisher : Cambridge University Press
ISBN 13 : 110817938X
Total Pages : 613 pages
Book Rating : 4.1/5 (81 download)

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Book Synopsis The Atmosphere and Climate of Mars by : Robert M. Haberle

Download or read book The Atmosphere and Climate of Mars written by Robert M. Haberle and published by Cambridge University Press. This book was released on 2017-06-29 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humanity has long been fascinated by the planet Mars. Was its climate ever conducive to life? What is the atmosphere like today and why did it change so dramatically over time? Eleven spacecraft have successfully flown to Mars since the Viking mission of the 1970s and early 1980s. These orbiters, landers and rovers have generated vast amounts of data that now span a Martian decade (roughly eighteen years). This new volume brings together the many new ideas about the atmosphere and climate system that have emerged, including the complex interplay of the volatile and dust cycles, the atmosphere-surface interactions that connect them over time, and the diversity of the planet's environment and its complex history. Including tutorials and explanations of complicated ideas, students, researchers and non-specialists alike are able to use this resource to gain a thorough and up-to-date understanding of this most Earth-like of planetary neighbours.