Lesfoil Large Eddy Simulation Of Flow Around A High Lift Airfoil

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LESFOIL: Large Eddy Simulation of Flow Around a High Lift Airfoil

Lars Davidson,Davor Cokljat,Jochen Fröhlich,Michael A. Leschziner,Chris Mellen,Wolfgang Rodi

Author : Lars Davidson,Davor Cokljat,Jochen Fröhlich,Michael A. Leschziner,Chris Mellen,Wolfgang Rodi
Publisher : Springer Science & Business Media
Page : 246 pages
File Size : 48,5 Mb
Release : 2012-09-22
Category : Technology & Engineering
ISBN : 9783540364573

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LESFOIL: Large Eddy Simulation of Flow Around a High Lift Airfoil by Lars Davidson,Davor Cokljat,Jochen Fröhlich,Michael A. Leschziner,Chris Mellen,Wolfgang Rodi Pdf

Large Eddy Simulation is a relatively new and still evolving computatio nal strategy for predicting turbulent flows. It is now widely used in research to elucidate fundamental interactions in physics of turbulence, to predict phe nomena which are closely linked to the unsteady features of turbulence and to create data bases against which statistical closure models can be asses sed. However, its applicability to complex industrial flows, to which statisti cal models are applied routinely, has not been established with any degree of confidence. There is, in particular, a question mark against the prospect of LES becoming an economically tenable alternative to Reynolds-averaged N avier-Stokes methods at practically high Reynolds numbers and in complex geometries. Aerospace flows pose particularly challenging problems to LES, because of the high Reynolds numbers involved, the need to resolve accura tely small-scale features in the thin and often transitional boundary layers developing on aerodynamic surfaces. When the flow also contains a separated region - due to high incidence, say - the range and disparity of the influen tial scales to be resolved is enormous, and this substantially aggravates the problems of resolution and cost. It is just this combination of circumstances that has been at the heart of the project LESFOIL to which this book is devoted. The project combined the efforts, resources and expertise of 9 partner organisations, 4 universities, 3 industrial companies and 2 research institu tes.

Direct and Large-Eddy Simulation IV

Bernard Geurts,Rainer Friedrich,Olivier Métais

Author : Bernard Geurts,Rainer Friedrich,Olivier Métais
Publisher : Springer Science & Business Media
Page : 543 pages
File Size : 55,8 Mb
Release : 2013-06-29
Category : Technology & Engineering
ISBN : 9789401712637

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Direct and Large-Eddy Simulation IV by Bernard Geurts,Rainer Friedrich,Olivier Métais Pdf

This volume contains the proceedings of the 2001 DLES4 workshop. It describes and discusses state-of-the-art modeling and simulation approaches for complex flows. Fundamental turbulence and modeling issues but also elements from modern numerical analysis are at the heart of this field of interest.

Engineering Turbulence Modelling and Experiments 6

Wolfgang Rodi

Author : Wolfgang Rodi
Publisher : Elsevier
Page : 1011 pages
File Size : 48,9 Mb
Release : 2005-05-05
Category : Science
ISBN : 9780080530956

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Engineering Turbulence Modelling and Experiments 6 by Wolfgang Rodi Pdf

Proceedings of the world renowned ERCOFTAC (International Symposium on Engineering Turbulence Modelling and Measurements). The proceedings include papers dealing with the following areas of turbulence: · Eddy-viscosity and second-order RANS models · Direct and large-eddy simulations and deductions for conventional modelling · Measurement and visualization techniques, experimental studies · Turbulence control · Transition and effects of curvature, rotation and buoyancy on turbulence · Aero-acoustics · Heat and mass transfer and chemically reacting flows · Compressible flows, shock phenomena · Two-phase flows · Applications in aerospace engineering, turbomachinery and reciprocating engines, industrial aerodynamics and wind engineering, and selected chemical engineering problems Turbulence remains one of the key issues in tackling engineering flow problems. These problems are solved more and more by CFD analysis, the reliability of which depends strongly on the performance of the turbulence models employed. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulent momentum, heat and mass transfer. For the understanding of turbulence phenomena, experiments are indispensable, but they are equally important for providing data for the development and testing of turbulence models and hence for CFD software validation. As in other fields of Science, in the rapidly developing discipline of turbulence, swift progress can be achieved only by keeping up to date with recent advances all over the world and by exchanging ideas with colleagues active in related fields.

High Performance Computing in Science and Engineering, Garching/Munich 2007

Siegfried Wagner,Matthias Steinmetz,Arndt Bode,Matthias Brehm

Author : Siegfried Wagner,Matthias Steinmetz,Arndt Bode,Matthias Brehm
Publisher : Springer Science & Business Media
Page : 700 pages
File Size : 50,7 Mb
Release : 2008-10-22
Category : Mathematics
ISBN : 9783540691822

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High Performance Computing in Science and Engineering, Garching/Munich 2007 by Siegfried Wagner,Matthias Steinmetz,Arndt Bode,Matthias Brehm Pdf

For the fourth time, the Leibniz Supercomputing Centre (LRZ) and the Com- tence Network for Technical, Scienti c High Performance Computing in Bavaria (KONWIHR) publishes the results from scienti c projects conducted on the c- puter systems HLRB I and II (High Performance Computer in Bavaria). This book reports the research carried out on the HLRB systems within the last three years and compiles the proceedings of the Third Joint HLRB and KONWIHR Result and Reviewing Workshop (3rd and 4th December 2007) in Garching. In 2000, HLRB I was the rst system in Europe that was capable of performing more than one Tera op/s or one billion oating point operations per second. In 2006 it was replaced by HLRB II. After a substantial upgrade it now achieves a peak performance of more than 62 Tera op/s. To install and operate this powerful system, LRZ had to move to its new facilities in Garching. However, the situation regarding the need for more computation cycles has not changed much since 2000. The demand for higher performance is still present, a trend that is likely to continue for the foreseeable future. Other resources like memory and disk space are currently in suf cient abundance on this new system.

Wind Energy - Impact of Turbulence

Michael Hölling,Joachim Peinke,Stefan Ivanell

Author : Michael Hölling,Joachim Peinke,Stefan Ivanell
Publisher : Springer Science & Business
Page : 207 pages
File Size : 40,8 Mb
Release : 2014-05-15
Category : Technology & Engineering
ISBN : 9783642546969

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Wind Energy - Impact of Turbulence by Michael Hölling,Joachim Peinke,Stefan Ivanell Pdf

This book presents the results of the seminar “Wind Energy and the Impact of Turbulence on the Conversion Process” which was supported from three societies, namely the EUROMech, EAWE and ERCOFATC and took place in Oldenburg, Germany in spring 2012. The seminar was one of the first scientific meetings devoted to the common topic of wind energy and basic turbulence. The established community of researchers working on the challenging puzzle of turbulence for decades met the quite young community of researchers, who face the upcoming challenges in the fast growing field of wind energy applications. From the fluid mechanical point of view, wind turbines are large machines operating in the fully turbulent atmospheric boundary layer. In particular they are facing small-scale turbulent inflow conditions. It is one of the central puzzles in basic turbulence research to achieve a fundamental understanding of the peculiarities of small-scale turbulence. This book helps to better understand the resulting aerodynamics around the wind turbine’s blades and the forces transmitted into the machinery in this context of puzzling inflow conditions. This is a big challenge due to the multi-scale properties of the incoming wind field ranging from local flow conditions on the profile up to the interaction of wake flows in wind farms.

High Performance Computing in Science and Engineering ' 07

Wolfgang E. Nagel

Author : Wolfgang E. Nagel
Publisher : Springer Science & Business Media
Page : 661 pages
File Size : 41,7 Mb
Release : 2007-12-18
Category : Mathematics
ISBN : 9783540747390

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High Performance Computing in Science and Engineering ' 07 by Wolfgang E. Nagel Pdf

This book presents the state-of-the-art in simulation on supercomputers. Leading researchers present results achieved on systems of the Stuttgart High Performance Computing Center in 2007. The reports cover all fields of computational science and engineering, with emphasis on industrially relevant applications. Presenting results for both vector-based and microprocessor-based systems, the book allows comparison between performance levels and usability of various architectures.

50 Years of CFD in Engineering Sciences

Akshai Runchal

Author : Akshai Runchal
Publisher : Springer Nature
Page : 950 pages
File Size : 50,8 Mb
Release : 2020-03-09
Category : Technology & Engineering
ISBN : 9789811526701

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50 Years of CFD in Engineering Sciences by Akshai Runchal Pdf

Prof. D. Brian Spalding, working with a small group of students and colleagues at Imperial College, London in the mid-to late-1960’s, single-handedly pioneered the use of Computational Fluid Dynamics (CFD) for engineering practice.This book brings together advances in computational fluid dynamics in a collection of chapters authored by leading researchers, many of them students or associates of Prof. Spalding. The book intends to capture the key developments in specific fields of activity that have been transformed by application of CFD in the last 50 years. The focus is on review of the impact of CFD on these selected fields and of the novel applications that CFD has made possible. Some of the chapters trace the history of developments in a specific field and the role played by Spalding and his contributions. The volume also includes a biographical summary of Brian Spalding as a person and as a scientist, as well as tributes to Brian Spalding by those whose life was impacted by his innovations. This volume would be of special interest to researchers, practicing engineers, and graduate students in various fields, including aerospace, energy, power and propulsion, transportation, combustion, management of the environment, health and pharmaceutical sciences.

High Performance Computing on Vector Systems 2007

Sabine Roller,Peter Lammers,Toshiyuki Furui,Martin Galle,Wolfgang Bez

Author : Sabine Roller,Peter Lammers,Toshiyuki Furui,Martin Galle,Wolfgang Bez
Publisher : Springer Science & Business Media
Page : 265 pages
File Size : 54,7 Mb
Release : 2007-10-16
Category : Computers
ISBN : 9783540743842

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High Performance Computing on Vector Systems 2007 by Sabine Roller,Peter Lammers,Toshiyuki Furui,Martin Galle,Wolfgang Bez Pdf

This book contains papers presented at the fifth and sixth Teraflop Workshop. It presents the state-of-the-art in high performance computing and simulation on modern supercomputer architectures. It covers trends in hardware and software development in general and specifically the future of vector-based systems and heterogeneous architectures. It covers computational fluid dynamics, fluid-structure interaction, physics, chemistry, astrophysics, and climate research.

MEGAFLOW - Numerical Flow Simulation for Aircraft Design

Norbert Kroll,Jens K. Fassbender

Author : Norbert Kroll,Jens K. Fassbender
Publisher : Springer Science & Business Media
Page : 311 pages
File Size : 40,7 Mb
Release : 2006-10-02
Category : Technology & Engineering
ISBN : 9783540323822

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MEGAFLOW - Numerical Flow Simulation for Aircraft Design by Norbert Kroll,Jens K. Fassbender Pdf

The aerospace industry increasingly relies on advanced numerical simulation tools in the early design phase. This volume provides the results of a German initiative which combines many of the CFD development activities from the German Aerospace Center (DLR), universities, and aircraft industry. Numerical algorithms for structured and hybrid Navier-Stokes solvers are presented in detail. The capabilities of the software for complex industrial applications are demonstrated.

Modelling Fluid Flow

János Vad,Tamás Lajos,Rudolf Schilling

Author : János Vad,Tamás Lajos,Rudolf Schilling
Publisher : Springer Science & Business Media
Page : 424 pages
File Size : 50,7 Mb
Release : 2013-04-17
Category : Technology & Engineering
ISBN : 9783662087978

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Modelling Fluid Flow by János Vad,Tamás Lajos,Rudolf Schilling Pdf

Modelling Fluid Flow presents invited lectures, workshop summaries and a selection of papers from a recent international conference CMFF '03 on fluid technology. The lectures follow the current evolution and the newest challenges of the computational methods and measuring techniques related to fluid flow. The workshop summaries reflect the recent trends, open questions and unsolved problems in the mutually inspiring fields of experimental and computational fluid mechanics. The papers cover a wide range of fluids engineering, including reactive flow, chemical and process engineering, environmental fluid dynamics, turbulence modelling, numerical methods, and fluid machinery.

New Results in Numerical and Experimental Fluid Mechanics VI

Cameron Tropea

Author : Cameron Tropea
Publisher : Springer Science & Business Media
Page : 973 pages
File Size : 49,7 Mb
Release : 2007-10-26
Category : Computers
ISBN : 9783540744580

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New Results in Numerical and Experimental Fluid Mechanics VI by Cameron Tropea Pdf

This volume features the contributions to the 15th Symposium of the STAB (German Aerospace Aerodynamics Association). Papers provide a broad overview of ongoing work in Germany, including high aspect ratio wings, low aspect ratio wings, bluff bodies, laminar flow control and transition, active flow control, hypersonic flows, aeroelasticity, aeroacoustics, mathematical fundamentals, numerical simulations, physical fundamentals, and facilities.

High Performance Computing in Science and Engineering ' 05

Wolfgang E. Nagel,Willi Jäger

Author : Wolfgang E. Nagel,Willi Jäger
Publisher : Springer Science & Business Media
Page : 342 pages
File Size : 54,8 Mb
Release : 2006-03-06
Category : Mathematics
ISBN : 9783540290643

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High Performance Computing in Science and Engineering ' 05 by Wolfgang E. Nagel,Willi Jäger Pdf

Provides the advances in modelling and simulation on supercomputers. Presenting results achieved on systems of the High Performance Computing Center Stuttgart (HLRS) for the year 2005, these reports cover various fields of computational science and engineering, ranging from CFD via computational physics and chemistry to computer science.

High Performance Computing on Vector Systems 2005

Thomas Bönisch,Katharina Benkert,Toshiyuki Furui,Yoshiki Seo,Wolfgang Bez

Author : Thomas Bönisch,Katharina Benkert,Toshiyuki Furui,Yoshiki Seo,Wolfgang Bez
Publisher : Springer Science & Business Media
Page : 246 pages
File Size : 55,5 Mb
Release : 2007-05-31
Category : Computers
ISBN : 9783540350743

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High Performance Computing on Vector Systems 2005 by Thomas Bönisch,Katharina Benkert,Toshiyuki Furui,Yoshiki Seo,Wolfgang Bez Pdf

The book presents the state of the art in high performance computing and simulation on modern supercomputer architectures. It covers trends in hardware and software development in general and specifically the future of vector-based systems and heterogeneous architectures. The application contributions include computational fluid dynamics, physics, chemistry, astrophysics, and biology. Innovative application fields like multiphysics simulations and material science are presented.

Important Factors for Accurate Scale-Resolving Simulations of Automotive Aerodynamics

Petter Ekman

Author : Petter Ekman
Publisher : Linköping University Electronic Press
Page : 96 pages
File Size : 55,8 Mb
Release : 2020-04-02
Category : Electronic books
ISBN : 9789179298630

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Important Factors for Accurate Scale-Resolving Simulations of Automotive Aerodynamics by Petter Ekman Pdf

Road transports are responsible for almost 18 % of the greenhouse gas emission in Europe and are today the leading cause of air pollution in cities. Aerodynamic resistance has a significant effect on fuel consumption and hence the emission of vehicles. For electric vehicles, emissions are not affected by the aerodynamics as such but instead have a significant effect on the effective range of the vehicle. In 2017, a new measurement procedure was introduced, Worldwide Harmonized Light Vehicles Test Procedure (WLTP), for measuring emissions, fuel consumption, and range. This procedure includes a new test cycle with increased average driving speed compared to the former procedure, which thereby increases the importance of the aerodynamic resistance, as it drastically increases with speed. A second effect is that the exact car configuration sold to the customer needs to be certified in terms of fuel consumption and emissions. The result is that every possible combination of optional extras, which might affect the aerodynamic resistance, needs to be aerodynamically analyzed and possibly improved. From 2021, the European Commission will introduce stricter emission regulations for new passenger cars, with the fleet-wide average lowered to 95 grams CO2=km, which puts an even higher demand on achieving efficient aerodynamics. Virtual development of the aerodynamics of road vehicles is today used to a great extent, using Computational Fluid Dynamics, as it enables faster and cheaper development. However, achieving high accuracy for the prediction of the flow field and aerodynamic forces is challenging, especially given the complexity of both the vehicle geometry in itself and the surrounding flow field. Even for a simplified generic bluff body, accurately predicting the flow field and aerodynamic forces is a challenge. The main reason for this challenge of achieving results with high accuracy is the prediction of the complex behavior of turbulence. Scale-resolving simulation (SRS) methods, such as Large Eddy Simulation (LES), where most of the turbulent structures are resolved has in many studies shown high accuracy but unfortunately to a very high computational cost. It is primarily the small turbulent structures within the near-wall region that requires a _ne resolution in both space (the mesh) and in time. This fine resolution is the reason for the very high computational cost and makes LES unfeasible for practical use in industrial aerodynamic development at present and in the near future. By modeling the turbulent structures within the near-wall region using a Reynolds-Averaged Navier-Stokes (RANS) model, and resolving the turbulence outside the region with a LES model, a coarser resolution is possible to use, resulting in significantly lower computational cost. Which used RANS model is of high importance, and especially how much turbulent viscosity the model generates, as too high values can result in suppression of the resolved turbulence. The transitioning between the RANS and LES regions have a significant effect on the results. Faster transition enables more resolved turbulence, favorable for higher accuracy, but needs to be balanced with sufficient shielding of the RANS region. If resolving the turbulence occurs within the near-wall region, and the mesh is not sufficiently fine, it can result in poor accuracy. By increasing the time-step size and disregarding best-practice guides, the computational cost can be significantly reduced. The accuracy is reasonably insensitive to the larger time step sizes until a certain degree, thereby enabling computationally cheaper SRS to achieve high accuracy of aerodynamic predictions needed to meet present and future emission regulations.

High Performance Computing in Science and Engineering, Munich 2004

Siegfried Wagner,Werner Hanke,Arndt Bode,Franz Durst

Author : Siegfried Wagner,Werner Hanke,Arndt Bode,Franz Durst
Publisher : Springer Science & Business Media
Page : 469 pages
File Size : 44,7 Mb
Release : 2005-12-06
Category : Mathematics
ISBN : 9783540266570

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High Performance Computing in Science and Engineering, Munich 2004 by Siegfried Wagner,Werner Hanke,Arndt Bode,Franz Durst Pdf

Leading-edge research groups in the field of scientific computing present their outstanding projects using the High Performance Computer in Bavaria (HLRB), Hitachi SR8000-F1, one of the top-level supercomputers for academic research in Germany. The projects address modelling and simulation in the disciplines Biosciences, Chemistry, Chemical Physics, Solid-State Physics, High-Energy Physics, Astrophysics, Geophysics, Computational Fluid Dynamics, and Computer Science. The authors describe their scientific background, their resource requirements with respect to top-level supercomputers, and their methods for efficient utilization of the costly high-performance computing power. Contributions of interdisciplinary research projects that have been supported by the Competence Network for Scientific High Performance Computing in Bavaria (KONWIHR) complete the broad range of supercomputer research and applications covered by this volume.

Lesfoil Large Eddy Simulation Of Flow Around A High Lift Airfoil

LESFOIL: Large Eddy Simulation of Flow Around a High Lift Airfoil by Lars Davidson,Davor Cokljat,Jochen Fröhlich,Michael A. Leschziner,Chris Mellen,Wolfgang Rodi Pdf

Direct and Large-Eddy Simulation IV by Bernard Geurts,Rainer Friedrich,Olivier Métais Pdf

Engineering Turbulence Modelling and Experiments 6 by Wolfgang Rodi Pdf

High Performance Computing in Science and Engineering, Garching/Munich 2007 by Siegfried Wagner,Matthias Steinmetz,Arndt Bode,Matthias Brehm Pdf

Wind Energy - Impact of Turbulence by Michael Hölling,Joachim Peinke,Stefan Ivanell Pdf

High Performance Computing in Science and Engineering ' 07 by Wolfgang E. Nagel Pdf

50 Years of CFD in Engineering Sciences by Akshai Runchal Pdf

High Performance Computing on Vector Systems 2007 by Sabine Roller,Peter Lammers,Toshiyuki Furui,Martin Galle,Wolfgang Bez Pdf

MEGAFLOW - Numerical Flow Simulation for Aircraft Design by Norbert Kroll,Jens K. Fassbender Pdf

Modelling Fluid Flow by János Vad,Tamás Lajos,Rudolf Schilling Pdf

New Results in Numerical and Experimental Fluid Mechanics VI by Cameron Tropea Pdf

High Performance Computing in Science and Engineering ' 05 by Wolfgang E. Nagel,Willi Jäger Pdf

High Performance Computing on Vector Systems 2005 by Thomas Bönisch,Katharina Benkert,Toshiyuki Furui,Yoshiki Seo,Wolfgang Bez Pdf

Important Factors for Accurate Scale-Resolving Simulations of Automotive Aerodynamics by Petter Ekman Pdf

High Performance Computing in Science and Engineering, Munich 2004 by Siegfried Wagner,Werner Hanke,Arndt Bode,Franz Durst Pdf

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