Improvement Of Cavitation And Fluid Structure Interaction Modelling In Water Hammer Computations
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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.
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 Interaction In Case Of Waterhammer With Cavitation
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Author : Arris Sieno Tijsseling
language : en
Publisher:
Release Date : 1993
Fluid Structure Interaction In Case Of Waterhammer With Cavitation written by Arris Sieno 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 categories.
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.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Advanced Computational Techniques For The Analysis Of 3 D Fluid Structure Interaction With Cavitation
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Author : Michael Alan Sprague
language : en
Publisher:
Release Date : 2002
Advanced Computational Techniques For The Analysis Of 3 D Fluid Structure Interaction With Cavitation written by Michael Alan Sprague and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Cavitation categories.
Modelling Of Intakes Cavitation And Pressure Surges
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Author : R. Higginbotham
language : en
Publisher: Bhra Fluid Engineering
Release Date : 1989
Modelling Of Intakes Cavitation And Pressure Surges written by R. Higginbotham and has been published by Bhra Fluid Engineering this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Cavitation categories.
Mechanical Vibrations Theory And Applications Si Edition
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Author : Kelly
language : en
Publisher: Cengage Learning
Release Date : 2012-08-14
Mechanical Vibrations Theory And Applications Si Edition written by Kelly and has been published by Cengage Learning this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-14 with Technology & Engineering categories.
MECHANICAL VIBRATIONS: THEORY AND APPLICATIONS takes an applications-based approach at teaching students to apply previously learned engineering principles while laying a foundation for engineering design. This text provides a brief review of the principles of dynamics so that terminology and notation are consistent and applies these principles to derive mathematical models of dynamic mechanical systems. The methods of application of these principles are consistent with popular Dynamics texts. Numerous pedagogical features have been included in the text in order to aid the student with comprehension and retention. These include the development of three benchmark problems which are revisited in each chapter, creating a coherent chain linking all chapters in the book. Also included are learning outcomes, summaries of key concepts including important equations and formulae, fully solved examples with an emphasis on real world examples, as well as an extensive exercise set including objective-type questions. Important Notice: Media content referenced within the product description or the product text may not be available in the ebook version.
Transactions Of The Institution Of Engineers Australia Civil Engineering
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Author :
language : en
Publisher:
Release Date : 1988
Transactions Of The Institution Of Engineers Australia Civil Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Civil engineering categories.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1948
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Mechanics, Applied categories.