Water Hammer And Fluid Structure Interaction Modelling
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Water Hammer And Fluid Structure Interaction Modelling
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Author : Sameh Mansour
language : en
Publisher:
Release Date : 1998
Water Hammer And Fluid Structure Interaction Modelling written by Sameh Mansour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Improvement Of Cavitation And Fluid Structure Interaction Modelling In Water Hammer Computations
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Author : S. G. S. Mansour
language : en
Publisher:
Release Date : 1994
Improvement Of Cavitation And Fluid Structure Interaction Modelling In Water Hammer Computations written by S. G. S. Mansour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Numeric Modelling Of Water Hammer Effects In Penstocks
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Author : Dominic Bernard
language : en
Publisher:
Release Date : 2013
Numeric Modelling Of Water Hammer Effects In Penstocks written by Dominic Bernard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with University of Ottawa theses categories.
Water hammer represents a complex hydraulic phenomenon with significant consequences on the proper functioning and safety of operation for pipe and conduit systems. The complexity and intricate physics of water hammer translated into significant difficulties associated firstly, with finding a proper solution for understanding the mechanism of its occurrence and, secondly, relating to proposing technically and economically viable design methods and devices that would help reduce and mitigate water hammer effects. In this context, the present thesis deals with the numerical modeling of the transient behaviour of water pipe segments. Following an extensive literature review of the state-of-the-art on the water hammer mechanisms and past work on experimental, analytical and numerical analysis of this phenomenon, a three dimensional numerical model of the water hammer in a pipe which considers the fluid-structure interaction (FSI) is developed using a Finite Element Method --Finite Volume Method (FEM-FVM) technique. Structural and fluid computational results based on rapid and slow gate closure scenarios are compared with existing closed-form solutions of the water hammer. A parametric study is also performed on a simply supported pipe segment to determine the influence of various design parameter. A systematic sensitivity analysis was conducted and a ranking mechanism was established for the importance of each parameter on the fluid fields and structural response. A first comparative analysis is conducted on horizontally and vertically bent elevated pipe segments to quantify the influence of the bend angle on the results. A second comparative analysis is performed on a horizontally bent segment buried in soil to determine the influence of the pipe interaction with the soil on the response. It is observed that the thickness, span, initial velocity and bend angle had a significant impact on the pressure and structural response. The presence of soil was observed to have a significant benefit in decreasing the von-Mises stresses.
Fluid Structure Interaction In Case Of Waterhammer With Cavitation
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Author : A. S. Tijsseling
language : en
Publisher:
Release Date : 1993
Fluid Structure Interaction In Case Of Waterhammer With Cavitation written by A. S. Tijsseling and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Cavitation categories.
Fluid Structure Interactions
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Author : Michael P. Paidoussis
language : en
Publisher: Academic Press
Release Date : 1998-10-12
Fluid Structure Interactions written by Michael P. Paidoussis and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-10-12 with Technology & Engineering categories.
This volume emphasizes the fundamentals and mechanisms giving rise to flow-induced vibration of use to researchers, designers, and operators. Fluid Structure Interactions provides useful problem-solving tools, and conveys the ideas in a physically comprehensible manner. The book includes a complete bibliography of important work in the field. . The Non-linear behaviour of Fluid-Structure interactions . The possible existence of chaotic oscillations . The use of this area as a model to demonstrate new mathematical techniques This book will prove invaluable to researchers, practitioners, and students in fluid-structure interactions, flow-induced vibrations, and dynamics and vibrations.
About An Important Phenomenon Water Hammer
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Author : Kamil Urbanowicz
language : en
Publisher: Mdpi AG
Release Date : 2024-01-05
About An Important Phenomenon Water Hammer written by Kamil Urbanowicz and has been published by Mdpi AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-05 with Technology & Engineering categories.
Explore "About an Important Phenomenon-Water Hammer", a groundbreaking Special Issue featuring insights from leading experts. When pressurized pipe flow is disrupted, water hammer-a once overlooked phenomenon-creates waves of importance in engineering, driving a dangerous surge. Dedicated to modeling water hammer and experimental verification, this Special Issue delves into contemporary water hammer discourse, tackling key challenges in fluid dynamics. It intertwines with related phenomena including fluid friction, cavitation, viscoelastic deformations, and fluid-structure interaction. Whether unraveling complexities or developing safeguarding methods, submissions enrich our understanding, enabling us to traverse historical origins, mathematical foundations, and contemporary dimensions. "About an Important Phenomenon-Water Hammer" is more than a publication; it is a platform for sharing insights and innovations shaping the future of fluid dynamics and practical engineering.
Fluid Structure Interaction And Moving Boundary Problems Iv
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Author : Subrata Kumar Chakrabarti
language : en
Publisher: WIT Press
Release Date : 2007
Fluid Structure Interaction And Moving Boundary Problems Iv written by Subrata Kumar Chakrabarti and has been published by WIT Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Science categories.
Publishing papers presented at the Fourth International Conference on Fluid Structure Interactions, this book features contributions from experts specialising in this field on new ideas and the latest techniques. A valuable addition to this successful series and will be of great interest to mechanical and structural engineers, offshore engineers, earthquake engineers, naval engineers and any other experts involved in topics related to fluid structure interaction. Topics covered include: Hydrodynamic Forces; Response of Structures including Fluid Dynamic; Offshore Structure and Ship Dynamics; Fluid Pipeline Interactions; Structure Response to Serve Shock and Blast Loading; Vortex Shedding and Flow Induced Vibrations; Cavitations Effects in Turbo Machines and Pumps; Wind Effects on Bridges and Tall Structures; Mechanics of Cables, Rivers and Moorings; Building Biofluids and Biological Tissue Interaction Problems in CFD; Experimental Studies and Validation; Vibrations and Noise; Free Surface Flows and Moving Boundary Problems.
Fluid And Structural Analysis Of Pipes Under Water Hammer Effects
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Author : Huade Cao
language : en
Publisher:
Release Date : 2020
Fluid And Structural Analysis Of Pipes Under Water Hammer Effects written by Huade Cao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The present study contributes to the analysis of pipes under water hammer by developing a hydraulic model, a structural model, and a fluid-pipe interaction model. Under the conventional hydraulic water hammer models based on the classical boundary conditions, the energy is dissipated along the pipe only through friction at the pipe-fluid interface. As a result, the predicted water hammer pressure waves are observed to dissipate in a pattern that differs from that observed in experimental studies. This is particularly the case for water hammer models with unsteady friction based on weighting-functions, in which the predicted pressure wave front keeps its original shape during propagation, as opposed to smoothen and widen as observed in experiments. In a bid to improve the predicted pressure wave front smoothing, the first contribution of the study postulates the presence of a water jet at the pipe inlet throughout water hammer, resulting in a newly proposed boundary expression. The boundary expression introduces an additional source of energy dissipation due to the reflection of the pressure wave at the pipe inlet. The boundary expression was applied in conjunction to three friction models in order to predict the pressure wave history. The model was calibrated based on published experimental data. The proposed boundary expression was shown to improve the predictive capability of the classical water hammer model in replicating of experimentally observed damping patterns in pressure history with respect to peak pressure values, wave front smoothing and phase shifting. While the classical water hammer model omits all inertial effects in the pipe wall, the extended water hammer model captures longitudinal inertial effects. Neither models, however, capture the bending stiffness of the pipe wall, thus predicting an unrealistic discontinuity in the radial displacement of the pipe wall in neighbourhood of the wave front. In order to remedy this limitation, the second contribution of the study develops a finite element formulation for the dynamic structural analysis of pipes subjected to general axisymmetric loading based on thin shell analysis. The validity of the formulation is demonstrated through comparisons with predictions of shell models based on the commercial software ABAQUS for static, natural vibration, and transient dynamic problems. The model is subsequently used to conduct a one-way coupled water hammer analysis, in which the transient pressure histories as predicted from the classical water hammer model is used as input into the structural model. The results suggest that the radial inertial effects in the pipe wall influence the predicted pipe response for fast valve closure scenarios, but the effect becomes negligible when the valve closure time is over eight times larger than the radial period of vibration. Water hammer models based on one-way coupling omit the fluid-pipe interaction effects. In order to capture such effects, the structural finite element model developed herein, was coupled to several hydraulic water hammer models, in a partitioned algorithm. The coupling was based on the Block Gauss-Seidel Algorithm, in which the hydraulic and structural models were iterated sequentially until convergence was attained within a specified tolerance before advancing to a new time step. A linear interpolation technique was adopted to exchange information between the non-matched fluid and structure interfaces. The number of iterations needed for convergence were accelerated by adopting either constant or dynamic relaxation factors. In order to assess the correctness of the implementation of the partitioned approach scheme, the classical and extended water hammer models were solved using the implemented Block Gauss-Seidel Algorithm and the results were compared to those based on the monolithic approach. The close agreement between both predictions demonstrated the validity of the Block Gauss-Seidel Algorithm implementation. The Algorithm was then extended to couple the structural shell finite element model developed herein with the hydraulic water hammer model. The effect of the specified convergence tolerance, the Courant number, the type of relaxation factor and fluid-structure interfaces, were investigated on the stability and computational efficiency for the partitioned models. The results indicate that the Aitken relaxation technique is recommended to accelerate the convergence rate of the two-way coupled analyses.
Fluid Structure Interaction Vii
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Author : C. A. Brebbia
language : en
Publisher: WIT Press
Release Date : 2013
Fluid Structure Interaction Vii written by C. A. Brebbia and has been published by WIT Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Science categories.
Containing papers presented at the Seventh International Conference on the topic, this book covers new developments in fluid structure interaction problems. First organised in 2001, the conference includes contributions from international experts on a variety of topics, including: Structure response to severe shock and blast; Hydrodynamic forces; Aeroelasticity; Computational methods; Flow induced vibrations; Experimental studies and validation; Bioengineering applications; Offshore structures; Soil structure interaction.
Mechanics Of Flow Induced Vibration
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Author : Rajeev Jaiman
language : en
Publisher: Springer Nature
Release Date : 2023-06-10
Mechanics Of Flow Induced Vibration written by Rajeev Jaiman and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-06-10 with Technology & Engineering categories.
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.