Download or read book Interfering of Two Tandem Cylinders Undergoing VIV written by Milad Armin and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Behaviour of two cylinders in tandem subjected to a stream of steady uniform flow is investigated. This research includes experimental and mathematical simulation so that a better understanding of the interaction between two bodies undergoing vortex induced vibration (VIV) can be achieved while one is submerged in the wake of the other. Amplitude and frequency of oscillation are observed for both cylinders when they are placed at different distances from each other. Positioning cylinders at various spacings can help to shed some light on the interaction mechanism of the upstream wake and trailing cylinder. An experimental investigation was carried out in sub-critical Reynolds number and low mass-damping to simulate the conditions in which offshore structures are deployed. Initially, two identical cylinders are placed in-line with the stream at various spacings. The response of leading cylinder is observed to be similar to that of an isolated cylinder experiencing VIV at all spacings. On the other hand, trailing cylinder response is observed to increase with flow velocity at small and medium spacings. Moreover,as the spacing grows large downstream response becomes more similar to that of the leading cylinder. Motion trajectory of trailing cylinder is significantly influenced by the leading body, and does not follow the typical figure of eight observed for an isolated cylinder at all velocities. Frequency power spectrum of obtained time histories reveals that two sources of excitation exist for trailing cylinder. Corresponding motion to each excitation source is determined using Fast Fourier Transform.The second set of experiment was conducted using similar cylinders with different natural frequencies to observe how it influences the interaction between two cylinders. It was observed that behaviour of trailing cylinder alters in comparison with initial set up. However, two sources of excitation are still detected in this set-up. Mathematical simulation is pursued by modelling the oscillating cylinders with a simple mass-spring-damper system. Furthermore, the force exerted to cylinders by wake is simulated by wake oscillators which can capture the self-exciting and self-limiting nature of VIV phenomenon. Two equations are coupled together by assuming that wake force is proportional to cylinder acceleration. Then, the system of equations is solved analytically,and results are compared to those obtained by a SimuLink model of the system. SimuLink model is solved by numerical RungeKutta method. It was observed that model is successful in simulating leading cylinder vibration amplitude,while it, initially, fails drastically to predict the oscillation amplitude of trailing cylinder due to buffeting vortices. Two terms were added to accommodate the effect of upstream wake on the trailing cylinder, to modify the force in the equation of motion which is respectively proportional to acceleration and velocity of the cylinder. Moreover, acceleration term is determined by fitting a linear function of the variable to the difference between upstream and downstream wake force obtaining from the experimental investigation results. Additionally, the damping term is determined by optimization of variance between simulation and experiment results. Such an observation can confirm that upstream turbulent wake has a significant influence on added mass coeffcient of the trailing cylinder which both are observed to be dependent on upstream Strouhal number.Overall, the agreement between mathematical model and experimental results is evaluated for both cylinders. Model error for trailing cylinder is calculated between 20% to 30% in cross-flow direction. This error is lower than that of the leading cylinder which is a well established method in literature for simulating VIV of an isolated cylinder.
Download or read book A Critical Review of the Intrinsic Nature of Vortex Induced Vibrations written by Turgut Sarpkaya and published by . This book was released on 2003 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a concise and comprehensive review of the progress made during the past two decades on vortex induced vibration (VIV) of mostly circular cylindrical structures subjected to steady uniform flow. The critical elements of the evolution of the ideas, theoretical insights, experimental methods, and numerical models are traced systematically; the strengths and weaknesses of the current state of the understanding of the complex fluid/structure interaction are discussed in some detail. Finally, some suggestions are made for further research on VIV. The organization of the paper is given at the end of the next section.
Download or read book Mechanics of Flow Induced Vibration written by Rajeev Jaiman and published by Springer Nature. This book was released on 2023-06-10 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses various passive and active techniques for controlling unsteady flow dynamics and associated coupled mechanics of fluid-structure interaction. Coupled multiphysics and multidomain simulations are emerging and challenging research areas, which have received significant attention during the past decade. One of the most common multiphysics and multidomain problems is fluid-structure interaction (FSI), i.e., the study of coupled physical systems involving fluid and a structure that have a mechanical influence on each other. Regardless of the application area, the investigation toward modeling of fluid-structure interaction and the underlying mechanisms in dealing with coupled fluid-structure instability with real-world applications remains a challenge to scientists and engineers. This book is designed for students and researchers who seek knowledge of computational modeling and control strategies for fluid-structure interaction. Specifically, this book provides a comprehensive review of the underlying unsteady physics and coupled mechanical aspects of the fluid-structure interaction of freely vibrating bluff bodies, the self-induced flapping of thin flexible structures, and aeroelasticity of shell structures. Understanding flow-induced loads and vibrations can lead to safer and cost-effective structures, especially for light and high-aspect ratio structures with increased flexibility and harsh environmental conditions. Using the body-fitted and moving mesh formulations, the physical insights associated with structure-to-fluid mass ratios, Reynolds number, nonlinear structural deformation, proximity interference, near-wall contacts, free-surface, and other interacting physical fields are covered in this book. In conjunction with the control techniques, data-driven model reduction approaches based on subspace projection and deep neural calculus are covered for low-dimensional modeling of unsteady fluid-structure interaction.
Download or read book Recent Advances in Mechanical Engineering written by Ivan Tolj and published by Springer Nature. This book was released on 2022-08-18 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the select proceedings of 5th International Conference on Mechanical Engineering (ICOME). ICOME is a series of international conference in mechanical engineering held every two years in Indonesia. The covered topics include aerodynamics and fluid mechanics, air conditioning and cooling system, turbomachinery and alternative fuels, modeling, simulation and optimization, thermodynamics and heat transfer, and combustion system. This book also covers material engineering, composite materials, biomaterials, fatigue and fracture, corrosion, tribology, and biomechanics. Given the contents, the book is useful for students, researchers, and professionals in the area of mechanical engineering and materials.
Download or read book Flow induced Vibration written by Robert D. Blevins and published by . This book was released on 2001-01-01 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focuses on applications for offshore platforms and piping; and, wind-induced vibration of buildings, bridges, and towers. This title also focuses on acoustic and mechanical vibration of heat exchangers, power lines, and process ducting.
Download or read book Ships and Offshore Structures XIX written by Carlos Guedes Soares and published by CRC Press. This book was released on 2015-09-03 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: This three-volume work presents the proceedings from the 19th International Ship and Offshore Structures Congress held in Cascais, Portugal on 7th to 10th September 2015. The International Ship and Offshore Structures Congress (ISSC) is a forum for the exchange of information by experts undertaking and applying marine structural research.The aim of
Download or read book The Anaesthesia Science Viva Book written by Simon Bricker and published by Cambridge University Press. This book was released on 2005 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The definitive guide to this part of the FRCA exam.
Download or read book Fluid Structure Interactions written by Michael P. Païdoussis and published by Cambridge University Press. This book was released on 2014-01-02 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structures in contact with fluid flow, whether natural or man-made, are inevitably subject to flow-induced forces and flow-induced vibration: from plant leaves to traffic signs and to more substantial structures, such as bridge decks and heat exchanger tubes. Under certain conditions the vibration may be self-excited, and it is usually referred to as an instability. These instabilities and, more specifically, the conditions under which they arise are of great importance to designers and operators of the systems concerned because of the significant potential to cause damage in the short term. Such flow-induced instabilities are the subject of this book. In particular, the flow-induced instabilities treated in this book are associated with cross-flow, that is, flow normal to the long axis of the structure. The book treats a specific set of problems that are fundamentally and technologically important: galloping, vortex-shedding oscillations under lock-in conditions, and rain-and-wind-induced vibrations, among others. The emphasis throughout is on providing a physical description of the phenomena that is as clear and up-to-date as possible.
Download or read book Beyond Vision written by Pavel Florensky and published by Reaktion Books. This book was released on 2006-08-15 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beyond Vision is the first English-language collection of essays on art by Pavel Florensky (1882–1937), Russian philosopher, priest, linguist, scientist, mathematician – and art historian. In addition to seven essays by Florensky, the book includes a biographical introduction and an examination of Florensky’s contribution as an art historian by Nicoletta Misler. Beyond Vision reveals Florensky’s fundamental attitudes to the vital questions of construction, composition, chronology, function and destination in the fields of painting, sculpture and design. His reputation as a theologian and philosopher is already established in the English-speaking world, but this first collection in English of his art essays (translated by Wendy Salmond) will be a revelation to those in the field. Pavel Florensky was a true polymath: trained in mathematics and philosophy at Moscow University, he rejected a scholarship in advanced mathematics in order to study theology at the Moscow Theological Academy. He was also an expert linguist, scientist and art historian. A victim of the Soviet government’s animosity towards religion, he was condemned to a Siberian labor camp in 1933 where he continued his work under increasingly difficult circumstances. He was executed in 1937.
Download or read book Springer Handbook of Ocean Engineering written by Manhar R. Dhanak and published by Springer. This book was released on 2016-07-23 with total page 1344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is the definitive reference for the interdisciplinary field that is ocean engineering. It integrates the coverage of fundamental and applied material and encompasses a diverse spectrum of systems, concepts and operations in the maritime environment, as well as providing a comprehensive update on contemporary, leading-edge ocean technologies. Coverage includes an overview on the fundamentals of ocean science, ocean signals and instrumentation, coastal structures, developments in ocean energy technologies and ocean vehicles and automation. It aims at practitioners in a range of offshore industries and naval establishments as well as academic researchers and graduate students in ocean, coastal, offshore and marine engineering and naval architecture. The Springer Handbook of Ocean Engineering is organized in five parts: Part A: Fundamentals, Part B: Autonomous Ocean Vehicles, Subsystems and Control, Part C: Coastal Design, Part D: Offshore Technologies, Part E: Energy Conversion
Download or read book Flow Induced Vibrations written by Eduard Naudascher and published by Courier Corporation. This book was released on 2012-03-27 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite their variety, the vibration phenomena from many different engineering fields can be classified into a relatively few basic excitation mechanisms. The classification enables engineers to identify all possible sources of excitation in a given system and to assess potential dangers. This graduate-level text presents a synthesis of research results and practical experience from disparate fields in the form of engineering guidelines. It is particularly geared toward assessing the possible sources of excitation in a flow system, in identifying the actual danger spots, and in finding appropriate remedial measures or cures. Flow-induced vibrations are presented in terms of their basic elements: body oscillators, fluid oscillators, and sources of excitation. By stressing these basic elements, the authors provide a basis for the transfer of knowledge from one system to another, as well as from one engineering field to another. In this manner, well-known theories on cylinders in cross-flow or well-executed solutions from the field of wind engineering--to name just two examples--may be useful in other systems or fields on which information is scarce. The unified approach is broad enough to permit treatment of the major excitation mechanism, yet simple enough to be of practical use.
Download or read book A Fuller Explanation written by Amy C. Edmondson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a broad sense Design Science is the grammar of a language of images rather than of words. Modern communication techniques enable us to transmit and reconstitute images without the need of knowing a specific verbal sequential language such as the Morse code or Hungarian. International traffic signs use international image symbols which are not specific to any particular verbal language. An image language differs from a verbal one in that the latter uses a linear string of symbols, whereas the former is multidimensional. Architectural renderings commonly show projections onto three mutually perpendicular planes, or consist of cross sections at differ ent altitudes representing a stack of floor plans. Such renderings make it difficult to imagine buildings containing ramps and other features which disguise the separation between floors; consequently, they limit the creativity of the architect. Analogously, we tend to analyze natural structures as if nature had used similar stacked renderings, rather than, for instance, a system of packed spheres, with the result that we fail to perceive the system of organization determining the form of such structures.
Download or read book Advances in Critical Flow Dynamics Involving Moving Deformable Structures with Design Applications written by Marianna Braza and published by Springer Nature. This book was released on 2021-02-10 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on the latest knowledge concerning critical phenomena arising in fluid-structure interaction due to movement and/or deformation of bodies. The focus of the book is on reporting progress in understanding turbulence and flow control to improve aerodynamic / hydrodynamic performance by reducing drag, increasing lift or thrust and reducing noise under critical conditions that may result in massive separation, strong vortex dynamics, amplification of harmful instabilities (flutter, buffet), and flow -induced vibrations. Theory together with large-scale simulations and experiments have revealed new features of turbulent flow in the boundary layer over bodies and in thin shear layers immediately downstream of separation. New insights into turbulent flow interacting with actively deformable structures, leading to new ways of adapting and controlling the body shape and vibrations to respond to these critical conditions, are investigated. The book covers new features of turbulent flows in boundary layers over wings and in shear layers immediately downstream: studies of natural and artificially generated fluctuations; reduction of noise and drag; and electromechanical conversion topics. Smart actuators as well as how smart designs lead to considerable benefits compared with conventional methods are also extensively discussed. Based on contributions presented at the IUTAM Symposium “Critical Flow Dynamics involving Moving/Deformable Structures with Design applications”, held in June 18-22, 2018, in Santorini, Greece, the book provides readers with extensive information about current theories, methods and challenges in flow and turbulence control, and practical knowledge about how to use this information together with smart and bio-inspired design tools to improve aerodynamic and hydrodynamic design and safety.
Download or read book Proceedings of the 14th International Ship and Offshore Structures Congress written by Hideomi Ohtsubo and published by . This book was released on 2000 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Review of Forensic Medicine and Toxicology written by Gautam Biswas and published by JP Medical Ltd. This book was released on 2012-07-20 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Up-to-date information, substantial amount of material on clinical Forensic Medicine included in a nutshell. Medical Jurisprudence, Identification, Autopsy, Injuries, Sexual Offences, Forensic Psychiatry and Toxicology are dealt with elaborately.
Download or read book Dynamics and Control of Energy Systems written by Achintya Mukhopadhyay and published by Springer Nature. This book was released on 2019-10-14 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances in dynamics and control of different types of energy systems. It covers research on dynamics and control in energy systems from different aspects, namely, combustion, multiphase flow, nuclear, chemical and thermal. The chapters start from the basic concepts so that this book can be useful even for researchers with very little background in the area. A dedicated chapter provides an overview on the fundamental aspects of the dynamical systems approach. The book will be of use to researchers and professionals alike.
Download or read book OSCEs for Medical Finals written by Hamed Khan and published by John Wiley & Sons. This book was released on 2013-01-22 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: OSCEs for Medical Finals has been written by doctors from a variety of specialties with extensive experience of medical education and of organising and examining OSCEs. The book and website package consists of the most common OSCE scenarios encountered in medical finals, together with checklists, similar to OSCE mark schemes, that cover all of the key learning points students need to succeed. Each topic checklist contains comprehensive exam-focussed advice on how to maximise performance together with a range of ‘insider's tips' on OSCE strategy and common OSCE pitfalls. Designed to provide enough coverage for those students who want to gain as many marks as possible in their OSCEs, and not just a book which will ensure students ‘scrape a pass', the book is fully supported by a companion website at www.wiley.com/go/khan/osces, containing: OSCE checklists from the book A survey of doctors and students of which OSCEs have a high chance of appearing in finals in each UK medical school
