Forces on a Transverse Circular Cylinder in a Steady Flow Near a Plane Boundary PDF Download

Author: Blaine Hafen
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 84

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Author: Blaine Hafen
Publisher:
ISBN:
Category : Cylinders
Languages : en
Pages : 170

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Book Description
An experimental study was conducted to determine the hydrodynamic forces on smooth and roughened circular cylinders as influenced by a nearby plane boundary. The ambient flow was perpendicular to the cylinder and parallel to the boundary. Measurements were taken in a water channel and a wind tunnel to obtain the influence of the boundary on the Strouhal number, lift and drag forces, and wake configuration. Reynolds numbers in the wind tunnel varied from 2 X 104 to 8 X 104, and the Reynolds number in the water channel was fixed at 5800. The value of CD for a smooth cylinder was found to increase about 20% to 60% as the cylinder neared the boundary, but at the boundary CD was about 15% less than the value in the free stream. Calculated values of CD based on the Strouhal number measured in the water channel compared favorably with CD values determined in the wind tunnel. The lift force was always positive due to wake effects.

Author: David William Meyers
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 57

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The mean in-line force and the time dependent transverse force acting on a circular cylinder undergoing periodic transverse oscillations in an otherwise steady flow was measured for various amplitudes and frequencies of oscillation at several steady flow velocities. The experiments were carried out in a recirculating water tunnel operating as a closed channel at the test section. The mean in-line force has been expressed in terms of a mean drag coefficient C sub di and plotted as a function of A/D and D/VT. The time dependent transverse force has been expressed in terms of the Fourier-averaged drag and inertia coefficients C sub di and C sub ml and plotted as functions of the relative amplitude A/D and the period parameter VT/D. The results have shown that the mean in-line force is significantly larger than that corresponding to steady flow about a non-oscillating cylinder and that energy may be transferred to the oscillating cylinder from the fluid at or near the vortex-shedding frequencies for the A/D values tested. (Author).

Author: Turgut 'Sarp' Sarpkaya
Publisher: Cambridge University Press
ISBN: 1139487590
Category : Technology & Engineering
Languages : en
Pages : 337

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A thorough understanding of the interaction of waves and currents with offshore structures has now become a vital factor in the safe and economical design of various offshore technologies. There has been a significant increase in the research efforts to meet this need. Although considerable progress has been made in the offshore industry and in the understanding of the interaction of waves, currents, and wind with ocean structures, most of the available books concentrate only on practical applications without a grounding in the physics. This text integrates an understanding of the physics of ocean-structure interactions with numerous applications. This more complete understanding will allow the engineer and designer to solve problems heretofore not encountered, and to design new and innovative structures. The intent of this book is to serve the needs of future generations of engineers designing more sophisticated structures at ever increasing depths.

Author: Don Tavolacci
Publisher:
ISBN:
Category : Fluid dynamics
Languages : en
Pages : 102

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Book Description
The flow configurations around and the forces acting on a circular cylinder with its axis parallel to a nearby plane boundary and subjected to a uniform flow were investigated. The flow conditions, which were perpendicular to the cylinder axis and parallel to the plane boundary were investigated experimentally and theoretically. Flow visualization was achieved through the use of tiny air bubbles entrapted in the fluid to locate the stagnation point and point of separation of flow. Also, the configuration of the cylinder wake was observed. A force measuring device employing the use of straingauges was used to record the change in lift and drag as the cylinder neared the plane boundary. The results showed that the drag and lift increased, and that the cylinder wake approximated that of an aerofoil configuration as the cylinder neared the plane boundary. In addition, as the cylinder approached the plane boundary, the top separation point of the cylinder boundary layer moved towards the front of the cylinder, the bottom separation point moved towards the rear of the cylinder, and the front stagnation point moved downward. The boundary layer along the plane boundary was observed to separate at a position downstream of the test cylinder. This separation point position was determined to be a function of the distance between the cylinder and the plane boundary for a specific Reynolds number.

Author: B. Mutlu Sumer
Publisher: World Scientific
ISBN: 9789810228989
Category : Technology & Engineering
Languages : en
Pages : 560

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Book Description
Originally published in 1977, Contact and Conflicthas remained an important book, which has inspired numerous scholars to examine further the relationships between the Indians and the Europeans -- fur traders as well as settlers. For this edition, Robin Fisher has written a new introduction in which he surveys the literature since 1977 and comments on any new insights into these relationships. Fisher contends that the fur trade had originally brought minimal cultural change to the Indians. In 1858 it essentially came to an end, and with the beginning of white settlement, there was a fundamental change in the relationship between Indians and Europeans. What had been a reciprocal system between the two civilizations became a pattern of white dominance. He shows that while the Indians had been able to adjust gradually to the changes introduced by the traders in the contact period, they lost control of their culture under the impact of colonization.

Author: Jorge Welti-Chanes
Publisher: CRC Press
ISBN: 1420006266
Category : Science
Languages : en
Pages : 570

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Specifically developed for food engineers, this is an in-depth reference book that focuses on transport phenomena in food preservation. First it reviews the fundamental concepts regarding momentum, heat, and mass transfer. Then the book examines specific applications of these concepts into a variety of traditional and novel processes and products.

Author: Turgut Sarpkaya
Publisher:
ISBN:
Category : Vibration
Languages : en
Pages : 126

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Book Description
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.

Author:
Publisher:
ISBN:
Category : Marine resources
Languages : en
Pages : 944

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Author: Rajeev Jaiman
Publisher: Springer Nature
ISBN: 9811985782
Category : Technology & Engineering
Languages : en
Pages : 1028

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Book Description
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.