Download or read book On the Assessment of Immersed Boundary Methods for Fluid structure Interaction Modelling written by Mathieu Specklin and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The meshing stage of a Computation Fluid Dynamics (CFD) problem is of crucial importance. In realistic engineering applications, issues arise when dealing with complex, sharp and moving boundaries, removing the possibility of automatic creation of a high quality structured mesh for instance. For Fluid-Structure Interaction (FSI) problems, the standard body-fitted meshing approaches are also limited to low structure deformation and to simple geometries. In light of these limitations, Immersed Boundary Methods (IBMs) have shown to be good alternatives for a broad range of problems. The present work sets out to build a set of numerical methods based on IBMs to simulate both the motion of rigid bodies and the transport of thin flexible solids. This research focuses on the specific area of waste water pumps. Firstly, IBMs are used to provide estimates of the hydrodynamic performances of centrifugal pumps. Secondly, this type of method is used to give a first answer regarding the characterization of the physical mechanism that leads to clogging in such pumps. The numerical tool is coupled to two different solvers for the fluid equations: (i) Navier-Stokes (NS) and (ii) Lattice-Boltzmann (LB). In the NS context, a sharp IBM based on a penalization method is developed and implemented in the open source library OpenFOAM in order to model the flow around rigid bodies. The complete model includes correction of the boundary conditions at the fluid-solid interface to improve the accuracy of the solution and coupling with turbulence models. To model the transport and the deformation of flexible structures, a diffuse penalty based IBM coupled to a solid model based on the variational derivative of the deformation energy is considered. In the LB context, the diffuse IBM available in the open source library Palabos is assessed for one-way coupling problems with rigid bodies. The latter is extended and coupled to the same solid model as above in order to study flexible structures. The capabilities and the accuracy of the two IBMs are assessed and compared with several test cases dealing with rigid bodies. For the sharp NS-IBM, numerical results of academic cases highlight the benefits brought by the corrections of the interface boundary conditions. In engineering cases, the method leads to results in good agreement with experimental data and numerical data from standard body-fitted simulations. Finally, for the IBMs aimed at modelling the flexible structures, both physical approaches compare well with previous numerical models in literature, and are giving promising results regarding the clogging mechanism.

Download or read book Analysis of Fluid Structure Interaction Problem Using Immersed Boundary Method with a Finite Element Approach written by Mong-Tang Ni and published by . This book was released on 2008 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulation of Two way Fluid structure Interaction Using Immersed Boundary and Finite Element Methods written by Tuan Mohammad Yusoff Shah Tuan Ya and published by . This book was released on 2009 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Algebraic Topology written by Edwin H. Spanier and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book surveys the fundamental ideas of algebraic topology. The first part covers the fundamental group, its definition and application in the study of covering spaces. The second part turns to homology theory including cohomology, cup products, cohomology operations and topological manifolds. The final part is devoted to Homotropy theory, including basic facts about homotropy groups and applications to obstruction theory.

Download or read book Development of a Spectral Element immersed Boundary Method for Fluid structure Interaction Problems written by 陳立杰 and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fluid Structure Interaction written by Hans-Joachim Bungartz and published by Springer Science & Business Media. This book was released on 2007-06-24 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume in the series Lecture Notes in Computational Science and Engineering presents a collection of papers presented at the International Workshop on FSI, held in October 2005 in Hohenwart and organized by DFG's Research Unit 493 "FSI: Modeling, Simulation, and Optimization". The papers address partitioned and monolithic coupling approaches, methodical issues and applications, and discuss FSI from the mathematical, informatics, and engineering points of view.

Download or read book Immersed Boundary Method written by Somnath Roy and published by Springer Nature. This book was released on 2020-05-15 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the emerging applications of immersed boundary (IB) methods in computational mechanics and complex CFD calculations. It discusses formulations of different IB implementations and also demonstrates applications of these methods in a wide range of problems. It will be of special value to researchers and engineers as well as graduate students working on immersed boundary methods, specifically on recent developments and applications. The book can also be used as a supplementary textbook in advanced courses in computational fluid dynamics.

Download or read book Immersed Boundary Method for Coupled Fluid structure Interaction Problems written by Amaury Bannier and published by . This book was released on 2012 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new fluid-structure interaction approach for bio-inspired regime is presented. In this method, the incompressible fluid flow is discretized using the fast immersed boundary method with nullspace approach, previously developed by Colonius and Taira. The Lagrangian solid dynamics solver is greatly inspired from the virtual node algorithm by Zhu et al. The two system are coupled to satisfy the physical constraints at their interface. A new weak formulation of the immersed boundary method coherently enforces the interface force balance and the no-slip condition. Boundary stresses are treated as Lagrange multipliers to maintain a strong coupling. Strongly coupled solver are known to handle problems on which weakly coupled methods encounter stability restrictions (problems including large density ratio for instance). Numerical simulations have been conducted to model the vibrations of an initially perturbed elastic disk immersed in a fluid. Results have shown an inconsistency in the enforcement of the boundary stress term on the fluid system. Accuracy and convergence of the solid and the fluid solvers have been evaluated.

Download or read book An Immersed Boundary Method for Fluid Structure Acoustics Interaction at Low Reynolds Numbers written by Li Wang and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Isogeometric Analysis written by J. Austin Cottrell and published by John Wiley & Sons. This book was released on 2009-08-11 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: “The authors are the originators of isogeometric analysis, are excellent scientists and good educators. It is very original. There is no other book on this topic.” —René de Borst, Eindhoven University of Technology Written by leading experts in the field and featuring fully integrated colour throughout, Isogeometric Analysis provides a groundbreaking solution for the integration of CAD and FEA technologies. Tom Hughes and his researchers, Austin Cottrell and Yuri Bazilevs, present their pioneering isogeometric approach, which aims to integrate the two techniques of CAD and FEA using precise NURBS geometry in the FEA application. This technology offers the potential to revolutionise automobile, ship and airplane design and analysis by allowing models to be designed, tested and adjusted in one integrative stage. Providing a systematic approach to the topic, the authors begin with a tutorial introducing the foundations of Isogeometric Analysis, before advancing to a comprehensive coverage of the most recent developments in the technique. The authors offer a clear explanation as to how to add isogeometric capabilities to existing finite element computer programs, demonstrating how to implement and use the technology. Detailed programming examples and datasets are included to impart a thorough knowledge and understanding of the material. Provides examples of different applications, showing the reader how to implement isogeometric models Addresses readers on both sides of the CAD/FEA divide Describes Non-Uniform Rational B-Splines (NURBS) basis functions

Download or read book The Immersed Boundary Method for Simulating Gravitational Settling and Fluid Shear induced Deformation of Elastic Structures written by Sudeshna Ghosh and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, we study several fluid-structure interaction problems in two dimensions using the "Immersed Boundary (IB) method". The IB method is a versatile and robust approach for simulating the interaction of complex, elastic structures with an incompressible fluid flow. The method has been used to simulate a wide range of biological and non-biological fluid-structure interaction problems. The particular choice of problems we study is motivated by the dynamics of biofilms which are characterized by flow-induced deformation of complex structures as well as free flowing suspended biofilm particles. In this work we consider massless as well as massive structures. For the massive structures, mass is incorporated by distributing point masses at a collection of IB points on and inside the structure. Our mathematical model for massive IB structures uses a Boussinesq approximation which is valid for [Delta][rho] is less than or equal to [rho][subscript f], where [rho][subscript f] is the density of the fluid and [Delta][rho] is the density difference between the structure and fluid. We consider gravitational settling of massive particles and aim to capture hydrodynamic interactions with bounding walls as well as other particles. In all cases, we perform extensive numerical simulations and comparisons to other published experimental and numerical results in the literature. Then we consider the deflection of a flexible cantilever beam in response to a shear flow. Our numerical results are discussed in the context of analytical results from the linear beam theory. This model is extended to handle porosity in the solid, which is a characteristic feature of biofilm layers.

Download or read book Development of an Immersed Boundary Method for the Simulation of Moving Bodies at Fluid fluid Interfaces written by Adam Robert O'Brien and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particles interacting with interfaces in multiphase flows appear in many scenarios of industrial interest, including bitumen extraction, mineral recovery via froth flotation, soil remediation, and many others. This thesis presents the development of Immersed Boundary Methods (IBMs) coupled to a two-phase incompressible flow solver. The phases are treated as immiscible, and are modelled using the Volume-of-Fluid (VOF) method. The methods developed to include the effects of surface tension and contact lines are presented. A detailed description of the numerical methods, as well as their implementation into a new software framework, are presented. Details regarding the solution of the resulting large systems of sparse equations in parallel are briefly described. The accuracy of the proposed models are demonstrated in three chapters; test cases range from validation of the correct contact angle for droplets sitting on curved surfaces, to more complex Fluid-Structure Interaction (FSI) problems involving moving objects at fluid-fluid interfaces. Stationary IBMs were coupled with a VOF multiphase solver, with the effects of surface tension included via the Continuum Surface Force (CSF) method. The domain was separated into fluid and solid regions, with coupling between them achieved through a ghost-cell interpolation procedure, which in effect prescribed the desired boundary conditions for the velocity and pressure fields. A new method was developed to include the effects of contact angle/wetting for moving boundary problems. For these problems, a unified momentum equation for both the fluid and solid phases was solved, and the effect of the boundary was introduced into the momentum equation via a body force term. Solutions to FSI problems involving strong capillary forces are presented and compared to experiments. Finally, an application of the proposed numerical methods to simulating porous media injection is shown. The algorithm's ability to predict an interface's transition between stable displacement, viscous fingering and capillary fingering is demonstrated.

Download or read book Complex Effects in Large Eddy Simulations written by Stavros Kassinos and published by Springer Science & Business Media. This book was released on 2007-07-16 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of Large Eddy Simulations is reaching a level of maturity that brings this approach to the mainstream of engineering computations, while it opens opportunities and challenges. The main objective of this volume is to bring together leading experts in presenting the state-of-the-art and emerging approaches for treating complex effects in LES. A common theme throughout is the role of LES in the context of multiscale modeling and simulation.

Download or read book Fluid Structure Interaction written by Stefan Frei and published by Walter de Gruyter GmbH & Co KG. This book was released on 2017-11-20 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph discusses modeling, adaptive discretisation techniques and the numerical solution of fluid structure interaction. An emphasis in part I lies on innovative discretisation and advanced interface resolution techniques. The second part covers the efficient and robust numerical solution of fluid-structure interaction. In part III, recent advances in the application fields vascular flows, binary-fluid-solid interaction, and coupling to fractures in the solid part are presented. Moreover each chapter provides a comprehensive overview in the respective topics including many references to concurring state-of-the art work. Contents Part I: Modeling and discretization On the implementation and benchmarking of an extended ALE method for FSI problems The locally adapted parametric finite element method for interface problems on triangular meshes An accurate Eulerian approach for fluid-structure interactions Part II: Solvers Numerical methods for unsteady thermal fluid structure interaction Recent development of robust monolithic fluid-structure interaction solvers A monolithic FSI solver applied to the FSI 1,2,3 benchmarks Part III: Applications Fluid-structure interaction for vascular flows: From supercomputers to laptops Binary-fluid–solid interaction based on the Navier–Stokes–Cahn–Hilliard Equations Coupling fluid-structure interaction with phase-field fracture: Algorithmic details

Download or read book Advances in Fluid Structure Interaction written by Marianna Braza and published by Springer. This book was released on 2016-04-07 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses flow separation within the context of fluid-structure interaction phenomena. Here, new findings from two research communities focusing on fluids and structures are brought together, emphasizing the importance of a unified multidisciplinary approach. The book covers the theory, experimental findings, numerical simulations, and modeling in fluid dynamics and structural mechanics for both incompressible and compressible separated unsteady flows. There is a focus on the morphing of lifting structures in order to increase their aerodynamic and/or hydrodynamic performances, to control separation and to reduce noise, as well as to inspire the design of novel structures. The different chapters are based on contributions presented at the ERCOFTAC Symposium on Unsteady Separation in Fluid-Structure Interaction held in Mykonos, Greece, 17-21 June, 2013 and include extended discussions and new highlights. The book is intended for students, researchers and practitioners in the broad field of computational fluid dynamics and computational structural mechanics. It aims at supporting them while dealing with practical issues, such as developing control strategies for unsteady separation and applying smart materials and biomimetic approaches for design and control.

Download or read book Modeling and Simulation of Turbulent Mixing and Reaction written by Daniel Livescu and published by Springer Nature. This book was released on 2020-02-19 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights recent research advances in the area of turbulent flows from both industry and academia for applications in the area of Aerospace and Mechanical engineering. Contributions include modeling, simulations and experiments meant for researchers, professionals and students in the area.

Download or read book Computational Science ICCS 2002 written by Peter M.A. Sloot and published by Springer. This book was released on 2003-08-01 with total page 1265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Science is the scientific discipline that aims at the development and understanding of new computational methods and techniques to model and simulate complex systems. The area of application includes natural systems - such as biology environ mental and geo-sciences, physics, and chemistry - and synthetic systems such as electronics and financial and economic systems. The discipline is a bridge bet ween 'classical' computer science - logic, complexity, architecture, algorithm- mathematics, and the use of computers in the aforementioned areas. The relevance for society stems from the numerous challenges that exist in the various science and engineering disciplines, which can be tackled by advances made in this field. For instance new models and methods to study environmental issues like the quality of air, water, and soil, and weather and climate predictions through simulations, as well as the simulation-supported development of cars, airplanes, and medical and transport systems etc. Paraphrasing R. Kenway (R.D. Kenway, Contemporary Physics. 1994): 'There is an important message to scientists, politicians, and industrialists: in the future science, the best industrial design and manufacture, the greatest medical progress, and the most accurate environmental monitoring and forecasting will be done by countries that most rapidly exploit the full potential of computational science'. Nowadays we have access to high-end computer architectures and a large range of computing environments, mainly as a consequence of the enormous sti mulus from the various international programs on advanced computing, e.g.