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Author: Zsolt-Andrei Peter Publisher: ISBN: Category : Languages : fr Pages : 228
Book Description
Le but de la thèse est l'analyse de simulations numériques directes de la turbulence bidimensionnelle dans un écoulement décrit par les équations de Navier-Stokes. Dans le traitement des données numériques (pression, vitesse et vorticité) on utilise des méthodes mathématiques combinées de traitement du signal et de l'image pour mieux comprendre le phénomène de la turbulence 2D. Le premier volet de l'étude porte sur l'analyse des signaux 1D en certain points de l'écoulement, tandis que le deuxième développe une analyse similaire pour les images de l'écoulement provenant de la même simulation. On a essayé de valider la coexistence des deux cascades dans le spectre d'énergie, prédit par Batchelor et Kraichnan. Parmi les techniques utilisées on compte l'analyse Fourier, les ondelettes et le modèle auto-régressif pour représenter et comparer le contenu des fréquences des signaux. On a réalisé une analyse temps-fréquences des données en utilisant l'algorithme de choix de la meilleur base des paquets d'ondelettes et cosinus. Ces fonctions de type paquets ont été aussi employées à la séparation de l'écoulement en parties significatives de point de vue physique. La méthode de la décomposition en valeurs singulières (POD), basée sur la théorie de Hilbert-Schmidt est aussi exploitée pour comprimer les donnés et pour localiser les structures cohérentes dans l'écoulement turbulent. Ces résultats ont été combinés dans le cadre de l'algorithme de matching-pursuit pour trouver les motifs d'écoulement qui sont cohérents avec un dictionnaire particulier (comme les paquets d'ondelettes et cosinus, fonction de Gabor, modes POD, modes prolate etc.).
Author: Zsolt-Andrei Peter Publisher: ISBN: Category : Languages : fr Pages : 228
Book Description
Le but de la thèse est l'analyse de simulations numériques directes de la turbulence bidimensionnelle dans un écoulement décrit par les équations de Navier-Stokes. Dans le traitement des données numériques (pression, vitesse et vorticité) on utilise des méthodes mathématiques combinées de traitement du signal et de l'image pour mieux comprendre le phénomène de la turbulence 2D. Le premier volet de l'étude porte sur l'analyse des signaux 1D en certain points de l'écoulement, tandis que le deuxième développe une analyse similaire pour les images de l'écoulement provenant de la même simulation. On a essayé de valider la coexistence des deux cascades dans le spectre d'énergie, prédit par Batchelor et Kraichnan. Parmi les techniques utilisées on compte l'analyse Fourier, les ondelettes et le modèle auto-régressif pour représenter et comparer le contenu des fréquences des signaux. On a réalisé une analyse temps-fréquences des données en utilisant l'algorithme de choix de la meilleur base des paquets d'ondelettes et cosinus. Ces fonctions de type paquets ont été aussi employées à la séparation de l'écoulement en parties significatives de point de vue physique. La méthode de la décomposition en valeurs singulières (POD), basée sur la théorie de Hilbert-Schmidt est aussi exploitée pour comprimer les donnés et pour localiser les structures cohérentes dans l'écoulement turbulent. Ces résultats ont été combinés dans le cadre de l'algorithme de matching-pursuit pour trouver les motifs d'écoulement qui sont cohérents avec un dictionnaire particulier (comme les paquets d'ondelettes et cosinus, fonction de Gabor, modes POD, modes prolate etc.).
Author: Patrick Siarry Publisher: John Wiley & Sons ISBN: 1118623673 Category : Technology & Engineering Languages : en Pages : 277
Book Description
This book describes the optimization methods most commonly encountered in signal and image processing: artificial evolution and Parisian approach; wavelets and fractals; information criteria; training and quadratic programming; Bayesian formalism; probabilistic modeling; Markovian approach; hidden Markov models; and metaheuristics (genetic algorithms, ant colony algorithms, cross-entropy, particle swarm optimization, estimation of distribution algorithms, and artificial immune systems).
Author: Ronald Lee Panton Publisher: Computational Mechanics ISBN: Category : Science Languages : en Pages : 448
Book Description
Why is wall turbulence self-sustaining? In this book well-regarded researchers not only discuss what they know and believe, but also speculate on ideas that still require numerical or experimental testing and verification. An initial brief history of boundary layer structure research is followed by chapters on experimental information and specific topics within the subject. There are then sections on computational aspects.
Author: Uriel Frisch Publisher: Springer Science & Business Media ISBN: 9401151180 Category : Science Languages : en Pages : 630
Book Description
Advances in Turbulence VII contains an overview of the state of turbulence research with some bias towards work done in Europe. It represents an almost complete collection of the invited and contributed papers delivered at the Seventh European Turbulence Conference, sponsored by EUROMECH and ERCOFTAC and organized by the Observatoire de la Côte d'Azur. New high-Reynolds number experiments combined with new techniques of imaging, non-intrusive probing, processing and simulation provide high-quality data which put significant constraints on possible theories. For the first time, it has been shown, for a class of passive scalar problems, why dimensional analysis sometimes gives the wrong answers and how anomalous intermittency corrections can be calculated from first principles. The volume is thus geared towards specialists in the area of flow turbulence who could not attend the conference as well as anybody interested in this rapidly moving field.
Author: Kevin W. Cassel Publisher: Cambridge University Press ISBN: 1108787622 Category : Technology & Engineering Languages : en Pages : 728
Book Description
Address vector and matrix methods necessary in numerical methods and optimization of linear systems in engineering with this unified text. Treats the mathematical models that describe and predict the evolution of our processes and systems, and the numerical methods required to obtain approximate solutions. Explores the dynamical systems theory used to describe and characterize system behaviour, alongside the techniques used to optimize their performance. Integrates and unifies matrix and eigenfunction methods with their applications in numerical and optimization methods. Consolidating, generalizing, and unifying these topics into a single coherent subject, this practical resource is suitable for advanced undergraduate students and graduate students in engineering, physical sciences, and applied mathematics.
Author: Jean-Michel Combes Publisher: Springer Science & Business Media ISBN: 3642759882 Category : Science Languages : en Pages : 337
Book Description
The last two subjects mentioned in the title "Wavelets, Time Frequency Methods and Phase Space" are so well established that they do not need any explanations. The first is related to them, but a short introduction is appropriate since the concept of wavelets emerged fairly recently. Roughly speaking, a wavelet decomposition is an expansion of an arbitrary function into smooth localized contributions labeled by a scale and a position pa rameter. Many of the ideas and techniques related to such expansions have existed for a long time and are widely used in mathematical analysis, theoretical physics and engineering. However, the rate of progress increased significantly when it was realized that these ideas could give rise to straightforward calculational methods applicable to different fields. The interdisciplinary structure (R.C.P. "Ondelettes") of the C.N.R.S. and help from the Societe Nationale Elf-Aquitaine greatly fostered these developments. The conference, the proceedings of which are contained in this volume, was held at the Centre National de Rencontres Mathematiques (C.N.R.M) in Marseille from December 14-18, 1987 and bought together an interdisciplinary mix of par ticipants. We hope that these proceedings will convey to the reader some of the excitement and flavor of the meeting.
Author: Sushabhan Choudhury Publisher: Springer Nature ISBN: 9811386188 Category : Technology & Engineering Languages : en Pages : 966
Book Description
The book focuses on the integration of intelligent communication systems, control systems, and devices related to all aspects of engineering and sciences. It includes high-quality research papers from the 3rd international conference, ICICCD 2018, organized by the Department of Electronics, Instrumentation and Control Engineering at the University of Petroleum and Energy Studies, Dehradun on 21–22 December 2018. Covering a range of recent advances in intelligent communication, intelligent control and intelligent devices., the book presents original research and findings as well as researchers’ and industrial practitioners’ practical development experiences of.
Author: Jonathan Skinner Publisher: ISBN: Category : Medical Languages : en Pages : 260
Book Description
A practical resource on using echcardiography by the specialist in infants four weeks old and younger. Lavish illustrations, clinical examples, and practical advice provide an excellent companion to those applying echocardiography for infant care.
Author: Ronald J. Adrian Publisher: Cambridge University Press ISBN: 0521440084 Category : Science Languages : en Pages : 585
Book Description
Particle image velocimetry, or PIV, refers to a class of methods used in experimental fluid mechanics to determine instantaneous fields of the vector velocity by measuring the displacements of numerous fine particles that accurately follow the motion of the fluid. Although the concept of measuring particle displacements is simple in essence, the factors that need to be addressed to design and implement PIV systems that achieve reliable, accurate, and fast measurements and to interpret the results are surprisingly numerous. The aim of this book is to analyze and explain them comprehensively.
Author: Zsolt-Andrei Peter
Author: Zsolt-Andrei Peter
Author: Patrick Siarry
Author: Ronald Lee Panton
Author: Uriel Frisch
Author: Yves Meyer
Author: Kevin W. Cassel
Author: Jean-Michel Combes
Author: Sushabhan Choudhury
Author: Jonathan Skinner
Author: Ronald J. Adrian