Fluid structure interaction (180 Ergebnisse)

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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - The development of complex energy converters generates currently unresolved demands on simulation tools. In this thesis, a model-based method to represent fluid-structure interaction is developed using the example of vertical-axis turbines. The kinematics of a turbine are simulated with a multi-body approach supporting flexible bodies. The dynamics of the flexible bodies are based on order-reduced models.The fluid domain is represented by Reynolds-averaged Navier-Stokes equations combined with an actuator-line method, a reduced model of the blade approximated by external forces in the momentum equations. Coupling of mechanical and fluid solver is achieved by a two-way iterative approach. The convergence rate is increased by usage of a step prediction based on quasi-Newton methods. An acceleration using a proper orthogonal decomposition to decompose the system dynamics achieves the fastest convergence rates. As an alternative to the partitioned approach a monolithic approach is outlined and its restrictions by using the selected solvers are identified.The simulation method is validated with experimental data and applied to vertical-axis turbines, both in air and water domains. Extensive validation of uncoupled flow problems and coupled dynamic response of turbines is accomplished. The results are in good agreement with experimental data and analytic solutions. Comparison to potential flow and streamtube methods shows the enhanced accuracy of the developed tool chain. Compared to available, fully meshed solutions, the computational costs are significantly lower.Conclusively, a vertical-axis tidal turbine with flexible blades is simulated and deflections are compared to a linear solution. The local blade deflections are examined and linked to wake-body interaction.…

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Taschenbuch. Zustand: Neu. Neuware - Fluid-structure interaction problems prove difficult due to the coupling between fluid and solid behavior. Typically, different theoretical formulations and numerical methods are used to solve fluid and structural problems separately. The leastsquares finite element method is capable of accurately solving both fluid and structural problems. This capability allows for a simultaneously coupled fluid structure interaction formulation using a single variational approach to solve complex and nonlinear aeroelasticity problems. The least-squares finite element method was compared to commonly used methods for both structures and fluids individually. The fluid analysis was compared to finite differencing methods and the structural analysis type compared to traditional Weak Galerkin finite element methods. The simultaneous solution method was then applied to aeroelasticity problems with a known solution. Achieving these results required unique iterative methods to balance each domain's or differential equation's weighting factor within the simultaneous solution scheme. The scheme required more computational time but it did provide the first hands-off method capable of solving complex fluid-structure interaction problems using a simultaneous least-squares formulation. A sequential scheme was also examined for coupled problems.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.…

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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Experiments on hydraulic components indicated that hydraulic pressure causes an additional load on the crack faces and that a viscous fluids do not flow out during rapid load changes, which reduces the effective damage amplitude. In this work, a simulation of the fluid-structure interaction is modeled with an averaged thin-film flow and coupled with a mechanical model. The simulation of the oil flow in the crack and the crack provides a better understanding of the FSI and its impact on fatigue.…

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Buch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - Computational fluid-structure interaction and flow simulation are challenging research areas that bring solution and analysis to many classes of problems in science, engineering, and technology. Young investigators under the age of 40 are conducting much of the frontier research in these areas, some of which is highlighted in this book. The first author of each chapter took the lead role in carrying out the research presented. The topics covered includeComputational aerodynamic and FSI analysis of wind turbines,Simulating free-surface FSI and fatigue-damage in wind-turbine structural systems,Aorta flow analysis and heart valve flow and structure analysis,Interaction of multiphase fluids and solid structures,Computational analysis of tire aerodynamics with actual geometry and road contact, andA general-purpose NURBS mesh generation method for complex geometries.This book will be a valuable resource for early-career researchers and students - not only those interested in computational fluid-structure interaction and flow simulation, but also other fields of engineering and science, including fluid mechanics, solid mechanics and computational mathematics - as it will provide them with inspiration and guidance for conducting their own successful research. It will also be of interest to senior researchers looking to learn more about successful research led by those under 40 and possibly offer collaboration to these researchers.…

Buch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - This book treats the derivation and implementation of a unified particle finite element formulation for the solution of fluid and solid mechanics, Fluid-Structure Interaction (FSI) and coupled thermal problems.FSI problems are involved in many engineering branches, from aeronautics to civil and biomedical engineering. The numerical method proposed in this book has been designed to deal with a large part of these. In particular, it is capable of simulating accurately free-surface fluids interacting with structures that may undergo large displacements, suffer from thermo-plastic deformations and even melt. The method accuracy has been successfully verified in several numerical examples. The thesis also contains the application of the proposed numerical strategy for the simulation of a real industrial problem. This thesis, defended at the Universitat Politecnica de Catalunya in 2015, was selected (ex aequo) as the best PhD thesis in numerical methods in Spain for theyear 2015 by the Spanish Society of Numerical Methods in Engineering (SEMNI).…

Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - This book treats the derivation and implementation of a unified particle finite element formulation for the solution of fluid and solid mechanics, Fluid-Structure Interaction (FSI) and coupled thermal problems.FSI problems are involved in many engineering branches, from aeronautics to civil and biomedical engineering. The numerical method proposed in this book has been designed to deal with a large part of these. In particular, it is capable of simulating accurately free-surface fluids interacting with structures that may undergo large displacements, suffer from thermo-plastic deformations and even melt. The method accuracy has been successfully verified in several numerical examples. The thesis also contains the application of the proposed numerical strategy for the simulation of a real industrial problem. This thesis, defended at the Universitat Politecnica de Catalunya in 2015, was selected (ex aequo) as the best PhD thesis in numerical methods in Spain for theyear 2015 by the Spanish Society of Numerical Methods in Engineering (SEMNI).…

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