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Author: Piotr Doerffer Publisher: Springer Science & Business Media ISBN: 3642030041 Category : Technology & Engineering Languages : en Pages : 349
Book Description
This volume contains description of experimental and numerical results obtained in the UFAST project. The goal of the project was to generate experiment data bank providing unsteady characteristics of the shock boundary layer interaction. The experiments concerned basic-reference cases and the cases with application of flow control devices. Obtained new data bank have been used for the comparison with available simulation techniques, starting from RANS, through URANS, LES and hybrid RANS-LES methods. New understanding of flow physics as well as ability of different numerical methods in the prediction of such unsteady flow phenomena will be discussed.
Author: Piotr Doerffer Publisher: Springer Science & Business Media ISBN: 3642030041 Category : Technology & Engineering Languages : en Pages : 349
Book Description
This volume contains description of experimental and numerical results obtained in the UFAST project. The goal of the project was to generate experiment data bank providing unsteady characteristics of the shock boundary layer interaction. The experiments concerned basic-reference cases and the cases with application of flow control devices. Obtained new data bank have been used for the comparison with available simulation techniques, starting from RANS, through URANS, LES and hybrid RANS-LES methods. New understanding of flow physics as well as ability of different numerical methods in the prediction of such unsteady flow phenomena will be discussed.
Author: Piotr Doerffer Publisher: Springer ISBN: 9783642030031 Category : Technology & Engineering Languages : en Pages : 336
Book Description
This volume contains description of experimental and numerical results obtained in the UFAST project. The goal of the project was to generate experiment data bank providing unsteady characteristics of the shock boundary layer interaction. The experiments concerned basic-reference cases and the cases with application of flow control devices. Obtained new data bank have been used for the comparison with available simulation techniques, starting from RANS, through URANS, LES and hybrid RANS-LES methods. New understanding of flow physics as well as ability of different numerical methods in the prediction of such unsteady flow phenomena will be discussed.
Author: Holger Babinsky Publisher: Cambridge University Press ISBN: 1139498649 Category : Technology & Engineering Languages : en Pages : 481
Book Description
Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
Author: Russell Jay Shaw Publisher: ISBN: Category : Languages : en Pages : 852
Book Description
An experimental investigation of the unsteady separation shock wave motion in plume-induced, boundary layer separated (PIBLS) flowfields has been conducted. The PIBLS flowfields were created in a blowdown-type wind tunnel designed specifically to produce PIBLS in a planar, two-stream, supersonic flow. In this unique wind tunnel, separation of the freestream boundary layer upstream of the base plane was accomplished by utilizing an angle-induced separation geometry in the wind tunnel design in addition to operating the wind tunnel at jet-to-freestream static pressure ratios (JSPRs) greater than unity. In essence, the wind tunnel design consisted of a Mach 1.5 inner-jet flow angled at 40 degrees with respect to a Mach 2.5 freestream flow in the presence of a 0.5-inch thick base height. By throttling the stagnation pressure of the inner-jet flow, PIBLS flowfields, with nominal separation point locations ranging from two (JSPR $approx$ 1.7) to six (JSPR $approx$ 2.3) or more boundary layer thicknesses upstream of the base plane, were produced in the wind tunnel. The separation process associated with all of these PIBLS flowfields was observed by flow visualization techniques to be unsteady, and the separation shock wave that accompanied the separation process was found to exhibit large-scale (on the order of the incoming boundary layer thickness) motion in the streamwise direction. The primary objective of the current research program was to understand the unsteady characteristics of the separation shock wave motion present in the PIBLS flowfields by obtaining and analyzing detailed, non-intrusive experimental data including flow visualization photographs, surface flow visualization patterns, mean static pressure measurements, and instantaneous pressure fluctuation measurements throughout the region of shock wave motion (called the intermittent region). Since the vast majority of the statistical properties of the shock wave motion were computed from the fast-response pressure transducer measurements, the instantaneous pressure fluctuation measurements were of primary importance in the study. In recent years, similar measurements have been used to characterize the unsteady separation shock wave motion in shock wave boundary/layer interactions (SWBLIs) produced by solid boundary protuberances (i.e., compression ramps, circular cylinders, sharp- and blunt-edged fins, etc.). However, such data are virtually nonexistent in a plume-induced interaction and, therefore, the current data are quite unique. From standard time series and conditional analysis methods applied to the pressure fluctuation measurements, the statistical properties of the shock wave motion were determined over the intermittent region. The shock wave motion was found to be responsible for producing large pressure fluctuations over the intermittent region in these PIBLS flowfields. The standard deviation of the pressure fluctuations, when nondimensionalized by the local mean pressure, reached a maximum value of 0.22 near the middle of the intermittent region. The strength of the unsteady shock wave motion, determined as the ratio of the maximum standard deviation of the pressure fluctuations over the intermittent region to the mean pressure difference across the intermittent region, was calculated to be 0.43 for the current PIBLS flowfields. Both of these quantities demonstrate that the unsteady pressure loading caused by the shock wave motion has essentially the same magnitude in plume-induced separated flowfields as in SWBLI flowfields produced by solid boundary protuberances.
Author: Shia-Hui Peng Publisher: Springer Science & Business Media ISBN: 3642141684 Category : Technology & Engineering Languages : en Pages : 360
Book Description
Hybrid modelling of turbulent flows, combining RANS and LES techniques, has received increasing attention over the past decade to fill the gap between (U)RANS and LES computations in aerodynamic applications at industrially relevant Reynolds numbers. With the advantage of hybrid RANS-LES modelling approaches, being considerably more computationally efficient than full LES and more accurate than (U)RANS, particularly for unsteady aerodynamic flows, has motivated numerous research and development activities. These activities have been increasingly stimulated by the provision of modern computing facilities. The present book contains the contributions presented at the Third Symposium on Hybrid RANS-LES Methods, held in Gdansk, Poland, 10-12 June 2009. To a certain extent, this conference was a continuation of the first symposium taking place in Stockholm (Sweden, 2005) and the second in Corfu (Greece, 2007). Motivated by the extensive interest in the research community, the papers presented at the Corfu symposium were published by Springer in the book entitled “Advances in Hybrid RANS-LES Modelling” (in Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 97). At the Gdansk symposium, along with four invited keynotes, given respectively by S. Fu, U. Michel, M. Sillen and P. Spalart, another 28 papers were presented on the following topics: Unsteady RANS, LES, Improved DES Methods, Hybrid RANS-LES Methods, DES versus URANS and other Hybrid Methods, Modelli- related Numerical Issues and Industrial Applications. After the symposium all full papers have been further reviewed and revised for publication in the present book.
Author: Piotr Doerffer Publisher: Springer Nature ISBN: 3030474615 Category : Technology & Engineering Languages : en Pages : 540
Book Description
This book presents experimental and numerical findings on reducing shock-induced separation by applying transition upstream the shock wave. The purpose is to find out how close to the shock wave the transition should be located in order to obtain favorable turbulent boundary layer interaction. The book shares findings obtained using advanced flow measurement methods and concerning e.g. the transition location, boundary layer characteristics, and the detection of shock wave configurations. It includes a number of experimental case studies and CFD simulations that offer valuable insights into the flow structure. It covers RANS/URANS methods for the experimental test section design, as well as more advanced techniques, such as LES, hybrid methods and DNS for studying the transition and shock wave interaction in detail. The experimental and numerical investigations presented here were conducted by sixteen different partners in the context of the TFAST Project. The general focus is on determining if and how it is possible to improve flow performance in comparison to laminar interaction. The book mainly addresses academics and professionals whose work involves the aerodynamics of internal and external flows, as well as experimentalists working with compressible flows. It will also be of benefit for CFD developers and users, and for students of aviation and propulsion systems alike.
Author: Marianna Braza Publisher: Springer Science & Business Media ISBN: 1402098987 Category : Science Languages : en Pages : 588
Book Description
This Volume is the Proceedings of the IUTAM Symposium on Unsteady Separated Flows and Their Control held in Corfu, Greece, 18–22 June 2007. This was the second IUTAM Symposium on this subject, following the symposium in Toulouse, in April 2002. The Symposium consisted of single plenary sessions with invited lectures, - lected oral presentations, discussions on special topics and posters. The complete set of papers was provided to all participants at the meeting. The thematic sessions of this Symposium are presented in the following: Experimental techniques for the unsteady ow separation Theoretical aspects and analytical approaches of ow separation Instability and transition Compressibility effects related to unsteady separation Statistical and hybrid turbulence modelling for unsteady separated ows Direct and Large-Eddy Simulation of unsteady separated ows Theoretical/industrial aspects of unsteady separated ow control This IUTAM Symposium concerned an important domain of Theoretical and Applied Mechanics nowadays. It focused on the problem of ow separation and of its control. It achieved a uni ed approach regrouping the knowledge provided from theoretical, experimental, numerical simulation and modelling aspects for unsteady separated ows (incompressible and compressible regimes) and included ef cient control devices to achieve attenuation or suppression of separation. The subject - eas covered important themes in the domain of fundamental research as well as in the domain of applications.
Author: Marian Bubak Publisher: Springer ISBN: 3319108948 Category : Computers Languages : en Pages : 538
Book Description
To help researchers from different areas of science understand and unlock the potential of the Polish Grid Infrastructure and to define their requirements and expectations, the following 13 pilot communities have been organized and involved in the PLGrid Plus project: Acoustics, AstroGrid-PL, Bioinformatics, Ecology, Energy Sector, Health Sciences, HEPGrid, Life Science, Materials, Metallurgy, Nanotechnologies, Quantum Chemistry and Molecular Physics, and SynchroGrid. The book describes the experience and scientific results achieved by the project partners. Chapters 1 to 8 provide a general overview of research and development activities in the framework of the project with emphasis on services for different scientific areas and an update on the status of the PL-Grid infrastructure, describing new developments in security and middleware. Chapters 9 to 13 discuss new environments and services which may be applied by all scientific communities. Chapters 14 to 36 present how the PLGrid Plus environments, tools and services are used in advanced domain specific computer simulations; these chapters present computational models, new algorithms, and ways in which they are implemented. The book also provides a glossary of terms and concepts. This book may serve as a resource for researchers, developers and system administrators working on efficient exploitation of available e-infrastructures, promoting collaboration and exchange of ideas in the process of constructing a common European e-infrastructure.
Author: Konstantinos Kontis Publisher: Springer ISBN: 3319731807 Category : Technology & Engineering Languages : en Pages : 410
Book Description
This edited monograph contains the proceedings of the International Shock Interaction Symposium, which emerged as an heir to both the Mach Reflection and Shock Vortex Interaction Symposia. These scientific biannual meetings provide an ideal platform to expose new developments and discuss recent challenges in the field of shock wave interaction phenomena. The goal of the symposia is to offer a forum for international interaction between young and established scientists in the field of shock and blast wave interaction phenomena. The target audience of this book comprises primarily researchers and experts in the field of shock waves, but the book may also be beneficial for young scientists and graduate students alike.
Author: Piotr Doerffer
Author: Piotr Doerffer
Author: Piotr Doerffer
Author: Holger Babinsky
Author: Russell Jay Shaw
Author: Shia-Hui Peng
Author: Piotr Doerffer
Author: Marianna Braza
Author: Marian Bubak
Author: Konstantinos Kontis
Author: Raymond A. Humble