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22 produkter
22 produkter
2 118 kr
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This volume contains the proceedings of DLES4, the fourth international ERCOFTAC workshop on Direct and Large-Eddy Simulation which was held at the University of Twente, July 18-20, 2001. It contains an exposition and discussion of modeling and simulation approaches for complex flows. Fundamental turbulence - and modeling issues and elements from modern numerical analysis are at the heart of this field of interest. Present-day DNS and LES tend to be extended toward flows of realistic complexity, at practically relevant flow conditions and with the inclusion of additional complex physical phenomena such as arise for example in combustion research, environmental flows, multiphase applications and process-engineering. These extensions of DNS and LES are illustrated in the contributions, while an ongoing interest remains with sophisticated modeling and numerical approaches, paying attention to physical, mathematical and engineering aspects.
Del 65 - Fluid Mechanics and Its Applications
Advances in LES of Complex Flows
Proceedings of the Euromech Colloquium 412, held in Munich, Germany 4∓6 October 2000
Inbunden, Engelska, 2002
1 590 kr
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This volume contains selected presentations of the "EUROMECH Colloquium 412 on LES of complex transitional and turbulent flows", held at the Munich University of Technology from 4 to 6 October 2000. The articles focus on developments in the field of large-eddy simulation of complex flows and are related to the topics: modelling and analysis of subgrid scales; numerical issues in LES cartesian grids for complex geometries; curvilinear and non-structured grids for complex geometries; DES and RANS-LES coupling; aircraft wake vortices; and combustion and magnetohydrodynamics. Progress has been made not only in understanding and modelling the dynamics of unresolved scales, but also in designing means that prevent the contamination of LES predictions by discretization errors. Progress is reported as well on the use of cartesian and curvilinear coordinates to compute flow in and around complex geometries and in the field of LES with unstructured grids.A chapter is dedicated to the detached-eddy simulation technique and its recent achievements and to the promising technique of coupling RANS and LES solutions in order to push the resolution-based Reynolds number limit of wall-resolving LES to higher values. Complexity due to physical mechanisms links the last two chapters. It is shown that LES constitutes the tool to analyse the physics of aircraft wake vortices during landing and takeoff. Its thorough understanding is a prerequisite for reliable predictions of the distance between consecutive landing airplanes. Subgrid combustion modelling for LES of single and two-phase reacting flows is demonstrated to have the potential to deal with finite-rate kinetics in high Reynolds number flows of full-scale gas turbine engines. Fluctuating magnetic fields are more reliably predicted by LES when tensor-diffusivity rather than gradient-diffusion models are used - an encouraging result in the context of turbulence control by magnetic fields.
Direct and Large-Eddy Simulation V
Proceedings of the fifth international ERCOFTAC Workshop on direct and large-eddy simulation held at the Munich University of Technology, August 27–29, 2003
Inbunden, Engelska, 2004
2 118 kr
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This volume contains the Proceedings of DLES-5, the fifth international ERCOFTAC workshop on direct and large-eddy simulation which was held at the Munich university of Technology, August 27-29, 2003. It covers all aspects of DNS and LES, but also hybrid methods like RANS/LES coupling and detached-eddy simulations designed to provide answers to technical flow problems at reasonable computational cost. Being organized in four parts, the book covers issues in LES modelling and numerics in its first part, i.e. subgrid-scale modelling, wall models for LES and numerical techniques as well as error estimation. Laminar-turbulent transition phenomena in incompressible and compressible flows form the topic of part 2. Turbulent flows involving complex physical phenomena like multiphase and non-Newtonian effects, scalar transport, combustion, compressibility and noise generation are at the heart of part 3. Turbulent flows in complex geometries bridge the gap in part 4 to practical flow configurations in aerodynamics, turbomachinery and several other applied sciences.
Direct and Large-Eddy Simulation VI
Proceedings of the Sixth International ERCOFTAC Workshop on Direct and Large-Eddy Simulation, held at the University of Poitiers, September 12-14, 2005
Inbunden, Engelska, 2006
3 174 kr
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The sixth ERCOFTAC Workshop on ‘Direct and Large-Eddy Simulation’ (DLES-6) was held at the University of Poitiers from September 12-14, 2005. Following the tradition of previous workshops in the DLES-series, this edition has reflected the state of the art of numerical simulation of transitional and turbulent flows and provided an active forum for discussion of recent developments in simulation techniques and understanding of flow physics. At a fundamental level this workshop addressed numerous theoretical and physical aspects of transitional and turbulent flows. At an applied level it contributed to the solution of problems related to energy production, transportation and the environment. Since the prediction and analysis of fluid turbulence and transition continues to challenge engineers, mathematicians and physicists, DLES-6 covered a large range of topics, from the more technical ones like numerical methods, initial and inflow conditions, the coupling of RANS and LES zones, subgrid and wall modelling to topics with a stronger focus on flow physics such as aero-acoustics, compressible and geophysical flows, flow control, multiphase flow and turbulent combustion, to quote only a few. The present proceedings contain the written versions of 7 invited lectures and 82 selected and reviewed contributions which are organized in 16 parts entitled Turbulent Mixing and Combustion; Subgrid Modelling; Flows involving Curvature, Rotation and Swirl; Free Turbulent Flows; Multiphase Flows; Wall Models for LES; Complex Geometries and Boundary Conditions; Flow Control; Heat Transfer; Aeroacoustics; Variable Density Flows; Inflow/Initial conditions; Separated/Reattached Flows; Hybrid RANS-LES Approach; Compressible Flows; and Numerical Techniques and POD.
1 362 kr
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Unlike conventional interpretations of Kant's Rechtslehre, Rainer Friedrich demonstrates that Kant does not derive the necessity of a state of public law from natural property law. Rather, the innate human right of liberty forms the subjective legal basis of the state.The close textual analysis both consults the preparatory studies to the doctrine of law and virtue and Kant's relevant lectures and considers contemporary commentaries. The study emphasizes the systematicity of duty underlying the Rechtslehre, Kant's doctrine of subjective rights, the doctrine of original acquisition and the significance of the general will for private law, together with the transition from private to public law. Rainer Friedrich provides a coherent historically and systematically arranged reconstruction of Kant's rationality of law.
1 590 kr
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The scientific work described in this book is the result of an international coopera tion of over 60 researchers from many different European countries over more than 10 years. Considerable advances have been made in the development, appli cation and improvement of methods and models for the calculation of emissions. Work on the quantification of uncertainties of emission data could be enhanced and carried out and uncertainty assessments conducted. The developed methods present the current state of the art in this field. Collaboration of teams has taken place under the EUROTRAC, the EUREKA project on the transport and chemical transformation of trace constituents in the troposphere over Europe extensive and networks of joint research work could be established across Europe. The editors wish to express their gratitude to all contributing authors and their teams for their cooperation, without which this book could never have been com piled. Furthermore, authors and editors alike are much obliged to the International Scientific Secretariate (ISS) of EUROTRAC, in particular Dr. Pauline Midgley, for outstanding support in the preparation of this book.
2 118 kr
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Transport causes a wide range of damage to human health, ecosytems and materials which are not reflected in the prices for transport. Thus, the damage caused by cars, planes, ships and trains should be known and transformed into monetary values, so called external costs. Within this book, a method to estimate the external costs stemming from the emissions of atmospheric pollutants of transport, including damage from greenhouse gases, fine particles, ozone, nitrous oxides, benzene and other carcinogenic substances, is described and applied to calculate the external costs of a huge number of current and future transport techniques operating in different locations all over Europe. A number of case studies demonstrate how the results can be used to aid policy decisions. The book is an important basis for assessing transport techniques, discussing transport taxes and charges and implementing ecopolitical instruments.
555 kr
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Ist die steuerliche Belastung der Autofahrer in der bestehenden Höhe berechtigt oder muß sie bei Anwendung des Verursacherprinzips erniedrigt oder gar weiter erhöht werden? Dies ist eine der zentralen Fragen mit denen sich dieses Buch beschäftigt. Die dabei angewandte Methode ist die Ermittlung der externen Kosten, also die Monetarisierung der auftretenden Schäden. Neben den Aufwendungen für den Bau und Unterhalt von Verkehrswegen sind dies vor allem Schäden an Personen, Umwelt und Materialien, die zu einem großen Teil von der Allgemeinheit getragen werden müssen. Die Autoren stellen damit rationale, nachvollziehbare Grundlagen für die aktuelle umwelt- und verkehrspolitische Diskussion zu Verfügung.
Tropospheric Modelling and Emission Estimation
Chemical Transport and Emission Modelling on Regional, Global and Urban Scales Chemistry Chemistry
Inbunden, Engelska, 1997
1 590 kr
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The end result of policy-related experimental and theoretical scientific work on the abatement of atmospheric emissions is a hierarchy of computer models that can be used to analyse and predict the behaviour of pollutants on urban, local regional and global scales. Such models are required to simulate an extremely complex natural situation in which a non-linear chemistry must be included together with the vagaries of the meteorology and the terrain. This book describes recent advances in the development and application of models on all scales, and in the techniques for the estimation and verification of emissions. It includes reviews of recent work together with detailed results and provides a useful picture of the field in a European context.
Umwelt- und Gesundheitsschäden durch die Stromerzeugung
Externe Kosten von Stromerzeugungssystemen
Häftad, Tyska, 1997
555 kr
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Dieses Buch bietet eine Fülle von Fakten und Argumenten für alle, die sich für die Bewertung von Stromerzeugungstechniken und der Gestaltung der künftigen Stromversorgung interessieren. Es liefert - unter anderem - konkrete Anhaltspunkte für die Ausgestaltung einer ökologischen Steuerreform. Es werden die wichtigsten Umwelt- und Gesundheitsschäden, die durch fossile, regenerative und nukleare Stromerzeugungstechniken entstehen, beschrieben und soweit wie möglich quantifiziert. Um diese Schäden vergleichend bewerten zu können, werden sie anschießend monetarisiert, d.h. ausgehend von den Präferenzen der Bevölkerung in sogenannte externe Kosten umgerechnet.
1 590 kr
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The scientific work described in this book is the result of an international coopera tion of over 60 researchers from many different European countries over more than 10 years. Considerable advances have been made in the development, appli cation and improvement of methods and models for the calculation of emissions. Work on the quantification of uncertainties of emission data could be enhanced and carried out and uncertainty assessments conducted. The developed methods present the current state of the art in this field. Collaboration of teams has taken place under the EUROTRAC, the EUREKA project on the transport and chemical transformation of trace constituents in the troposphere over Europe extensive and networks of joint research work could be established across Europe. The editors wish to express their gratitude to all contributing authors and their teams for their cooperation, without which this book could never have been com piled. Furthermore, authors and editors alike are much obliged to the International Scientific Secretariate (ISS) of EUROTRAC, in particular Dr. Pauline Midgley, for outstanding support in the preparation of this book.
2 118 kr
Skickas inom 10-15 vardagar
Transport causes a wide range of damage to human health, ecosytems and materials which are not reflected in the prices for transport. Thus, the damage caused by cars, planes, ships and trains should be known and transformed into monetary values, so called external costs. Within this book, a method to estimate the external costs stemming from the emissions of atmospheric pollutants of transport, including damage from greenhouse gases, fine particles, ozone, nitrous oxides, benzene and other carcinogenic substances, is described and applied to calculate the external costs of a huge number of current and future transport techniques operating in different locations all over Europe. A number of case studies demonstrate how the results can be used to aid policy decisions. The book is an important basis for assessing transport techniques, discussing transport taxes and charges and implementing ecopolitical instruments.
Tropospheric Modelling and Emission Estimation
Chemical Transport and Emission Modelling on Regional, Global and Urban Scales Chemistry Chemistry
Häftad, Engelska, 2010
1 590 kr
Skickas inom 10-15 vardagar
The end result of policy-related experimental and theoretical scientific work on the abatement of atmospheric emissions is a hierarchy of computer models that can be used to analyse and predict the behaviour of pollutants on urban, local regional and global scales. Such models are required to simulate an extremely complex natural situation in which a non-linear chemistry must be included together with the vagaries of the meteorology and the terrain. This book describes recent advances in the development and application of models on all scales, and in the techniques for the estimation and verification of emissions. It includes reviews of recent work together with detailed results and provides a useful picture of the field in a European context.
385 kr
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Tropospheric Ozone Abatement
Developing Efficient Strategies for the Reduction of Ozone Precursor Emissions in Europe
Häftad, Engelska, 2011
1 073 kr
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The occurrence of high concentrations of ozone during summer episodes in the troposphere over Europe is a problem still unsolved. Although a number· of measures have been implemented that will achieve a further reduction of precursor emissions in the next years, this will not be sufficient to reduce the ozone concentration to levels below thresholds set up to protect human health and plants. Thus, further reductions of emissions of volatile organic compounds and nitrogen oxides are necessary. However, with regard to the increasing costs associated with increasing emission reduction, it is essential to implement abatement strategies, that are effective, i.e. achieving the environmental aim set up, and efficient, i. e. doing this with the least costs possible. In this book, the authors describe the features and the application of a methodology and a model system to identify effective and efficient strategies to reduce ambient concentrations of tropospheric ozone to comply with thresholds set up to protect human health, agricultural crops and ecosystems. Furthermore, macroeconomic impacts of such strategies are addressed and, as burden and benefits of these strategies are not equally distributed between countries, different burden sharing schemes are discussed. The content of this book is based on results of a comprehensive research project, the project INFOS (assessment of policy instruments for efficient ozone abatement strategies in Europe), funded by the European Commission (Directorate General XII) under the Fourth Framework Programme for research, technological development and demonstration activities.
Turbulent Shear Flows 8
Selected Papers from the Eighth International Symposium on Turbulent Shear Flows, Munich, Germany, September 9 – 11, 1991
Häftad, Engelska, 2011
1 073 kr
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This volume contains a selection of the papers presented at the Eighth Symposium on Turbulent Shear Flows held at the Technical University of Munich, 9-11 September 1991. The first of these biennial international symposia was held at the Pennsylvania State Uni versity, USA, in 1977; subsequent symposia have been held at Imperial College, London, England; the University of California, Davis, USA; the University of Karlsruhe, Ger many; Cornell University, Ithaca, USA; the Paul Sabatier University, Toulouse, France; and Stanford University, California, USA. The purpose of this series of symposia is to provide a forum for the presentation and discussion of new developments in the field of turbulence, especially as related to shear flows of importance in engineering and geo physics. From the 330 extended abstracts submitted for this symposium, 145 papers were presented orally and 60 as posters. Out of these, we have selected twenty-four papers for inclusion in this volume, each of which has been revised and extended in accordance with the editors' recommendations. The following four theme areas were selected after consideration of the quality of the contributions, the importance of the area, and the selection made in earlier volumes: - wall flows, - separated flows, - compressibility effects, - buoyancy, rotation, and curvature effects. As in the past, each section corresponding to the above areas begins with an introduction by an authority in the field that places the individual contributions in context with one another and with related research.
634 kr
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Direct and Large Eddy Simulation of Turbulence
Proceedings of the EUROMECH Colloquium No. 199, München, FRG, September 30 to October 2, 1985
Häftad, Engelska, 1986
1 073 kr
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This volume contains papers presented to a EUROMECH-Colloquium held in Munich, September 30 to October 2, 1985. The Colloquium is number 199 in a series of colloquia inaugurated by the European Mechanics Committee. The meeting was jointly organized by the 'Lehrstuhl fur Stromungsmechanik' at the 'Technische Universitat Munchen' and the 'Institut fur Physik der Atmosphare' of the 'Deutsche Forschungs- und Versuchsanstalt fur Luft- und Raumfahrt' (DFVLR) in Oberpfaffenhofen. 'Direct' and 'large eddy simulation' are terms which denote two closely con- nected methods of turbulence research. In a 'direct simulation' (DS), turbu- lent motion is simulated by numerically integrating the Navier-Stokes equations in three-dimensional space and as a function of time. Besides ini- tial and boundary conditions no physical simplifications are involved. Com- puter resources limit the resolution in time and space, though simulations with an order of one million discrete points in space are feasible. The simu- lated flow fields can be considered as true realizations of turbulent flow fields and analysed to answer questions on the basic behaviour of turbulence.Direct simulations are valid as long as all the excited scales remain within the band of resolved scales. This means that viscosity must be strong enough to damp out the not resolved scales or the simulation is restricted to a lim- ited integration-time interval only. In summary, DS provides a tool to investigate turbulent motions from first principles at least for a finite band of scales.
2 118 kr
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The workshop 'Direct and Large-Eddy Simulation-4' was held at the Uni versity ofTwente, July 18-20, 2001. DLES4is part of a series ofERCOFfAC workshops that originated at the University of Surrey in 1994. Over the years the DLES-series has grown into a major international venue focused on the development and application of direct and large-eddy simulation. Fundamental turbulence - and modeling issues but also elements from modem numerical analysis are at the heart of this field of interest, a fact which is clearly reflected by the contents of these proceedings. Modeling and simulation of complex flow phenomena forms a central ele ment in a large volume of scientific - and applied research. The problem of simulating turbulent flows and capturing their main dynamical features remains a highly motivating challenge. This three-day workshop focused on recent de velopments in numerical and physical modeling of complex flow phenomena concentrating on modem strategies in the field of direct and large-eddy simula tion. A major aim was to promote the exchange of ideas and problems from both industrial and academic background paying attention to physical, mathematical and engineering aspects.
Advances in LES of Complex Flows
Proceedings of the Euromech Colloquium 412, held in Munich, Germany 4∓6 October 2000
Häftad, Engelska, 2010
1 590 kr
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The articles focus on new developments in the field of large-eddy simulation of complex flows and are related to the topics: modelling and analysis of subgrid scales, numerical issues in LES cartesian grids for complex geometries, curvilinear and non-structured grids for complex geometries. DES and RANS-LES coupling, aircraft wake vortices, combustion and magnetohydrodynamics. Progress has been made not only in understanding and modelling the dynamics of unresolved scales, but also in designing means that prevent the contamination of LES predictions by discretization errors. Progress is reported as well on the use of cartesian and curvilinear coordinates to compute flow in and around complex geometries and in the field of LES with unstructured grids. A chapter is dedicated to the detached-eddy simulation technique and its recent achievements and to the promising technique of coupling RANS and LES solutions in order to push the resolution-based Reynolds number limit of wall-resolving LES to higher values. Complexity due to physical mechanisms links the last two chapters. It is shown that LES constitutes the tool to analyse the physics of aircraft wake vortices during landing and takeoff. Its thorough understanding is a prerequisite for reliable predictions of the distance between consecutive landing airplanes. Subgrid combustion modelling for LES of single and two-phase reacting flows is demonstrated to have the potential to deal with finite-rate kinetics in high Reynolds number flows of full-scale gas turbine engines. Fluctuating magnetic fields are more reliably predicted by LES when tensor-diffusivity rather than gradient-diffusion models are used. An encouraging result in the context of turbulence control by magnetic fields.
Direct and Large-Eddy Simulation V
Proceedings of the fifth international ERCOFTAC Workshop on direct and large-eddy simulation held at the Munich University of Technology, August 27–29, 2003
Häftad, Engelska, 2010
2 118 kr
Skickas inom 10-15 vardagar
This volume contains the Proceedings of DLES-5, the fifth international ERCOFTAC workshop on direct and large-eddy simulation which was held at the Munich university of Technology, August 27-29, 2003. It covers all aspects of DNS and LES, but also hybrid methods like RANS/LES coupling and detached-eddy simulations designed to provide answers to technical flow problems at reasonable computational cost. Being organized in four parts, the book covers issues in LES modelling and numerics in its first part, i.e. subgrid-scale modelling, wall models for LES and numerical techniques as well as error estimation. Laminar-turbulent transition phenomena in incompressible and compressible flows form the topic of part 2. Turbulent flows involving complex physical phenomena like multiphase and non-Newtonian effects, scalar transport, combustion, compressibility and noise generation are at the heart of part 3. Turbulent flows in complex geometries bridge the gap in part 4 to practical flow configurations in aerodynamics, turbomachinery and several other applied sciences.
Direct and Large-Eddy Simulation VI
Proceedings of the Sixth International ERCOFTAC Workshop on Direct and Large-Eddy Simulation, held at the University of Poitiers, September 12-14, 2005
Häftad, Engelska, 2010
3 174 kr
Skickas inom 10-15 vardagar
The sixth ERCOFTAC Workshop on ‘Direct and Large-Eddy Simulation’ (DLES-6) was held at the University of Poitiers from September 12-14, 2005. Following the tradition of previous workshops in the DLES-series, this edition has reflected the state of the art of numerical simulation of transitional and turbulent flows and provided an active forum for discussion of recent developments in simulation techniques and understanding of flow physics. At a fundamental level this workshop addressed numerous theoretical and physical aspects of transitional and turbulent flows. At an applied level it contributed to the solution of problems related to energy production, transportation and the environment. Since the prediction and analysis of fluid turbulence and transition continues to challenge engineers, mathematicians and physicists, DLES-6 covered a large range of topics, from the more technical ones like numerical methods, initial and inflow conditions, the coupling of RANS and LES zones, subgrid and wall modelling to topics with a stronger focus on flow physics such as aero-acoustics, compressible and geophysical flows, flow control, multiphase flow and turbulent combustion, to quote only a few. The present proceedings contain the written versions of 7 invited lectures and 82 selected and reviewed contributions which are organized in 16 parts entitled Turbulent Mixing and Combustion; Subgrid Modelling; Flows involving Curvature, Rotation and Swirl; Free Turbulent Flows; Multiphase Flows; Wall Models for LES; Complex Geometries and Boundary Conditions; Flow Control; Heat Transfer; Aeroacoustics; Variable Density Flows; Inflow/Initial conditions; Separated/Reattached Flows; Hybrid RANS-LES Approach; Compressible Flows; and Numerical Techniques and POD.