Modeling Fluid Structure Interaction Over A Flexible Fin Attached To A Naca0012 Airfoil

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Modeling Fluid Structure Interaction Over a Flexible Fin Attached to a NACA0012 Airfoil

Author : Srinivasa Ravindra Pantula
Publisher :
ISBN 13 :
Total Pages : 167 pages
Book Rating : 4.:/5 (456 download)

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Book Synopsis Modeling Fluid Structure Interaction Over a Flexible Fin Attached to a NACA0012 Airfoil by : Srinivasa Ravindra Pantula

Download or read book Modeling Fluid Structure Interaction Over a Flexible Fin Attached to a NACA0012 Airfoil written by Srinivasa Ravindra Pantula and published by . This book was released on 2008 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow separation control is of importance to the performance of air vehicles. Generally, it is desired to postpone separation such that the overall drag is reduced, stall is delayed, lift is enhanced, and pressure recovery is improved. This work explores a new concept of post-stall flow control for airfoils and wings by using a thin flexible fin attached on the upper surface of an airfoil to passively manipulate flow structures in the fully separated flows for drag reduction and lift enhancement. The flow induced oscillations combined with the shape deformations change the overall pressure distribution on the fin, which in turn affect the fin dynamics. This mutual effect of inertial and elastic forces can also be considered through fluid-structure interactions (FSI). In order to study this problem a Navier-Stokes finite difference solver is coupled with a subdivision finite element solver in a segregated manner. The moving interface (i.e. fin) is modeled by a non-boundary conforming method called Immersed Boundary Methods (IBM). In the present dissertation validations for the Computational Fluid Dynamics (CFD), the Computational Structural Dynamics (CSD) and the Immersed boundary method (IBM) are presented. Then the coupled CFD-CSD solver is first used to model flow induced flapping flat plate with a 5[degree] angle of attack at Re = 20,000. Finally, the coupled solver is used to simulate flow over a NACA0012 airfoil with a passive flexible flapping fin attached to the upper surface of the airfoil with a 18[degree] angle of attack at Re = 63,000. The time averaged drag coefficient around the NACA0012 airfoil with the fin is computed at various angles of attack and compared with the baseline drag coefficient. The results show that the computations follow the experimental trend of drag reduction at higher angles of attack.

Fluid-Structure Interaction

Author : Hans-Joachim Bungartz
Publisher : Springer Science & Business Media
ISBN 13 : 3540345965
Total Pages : 401 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis Fluid-Structure Interaction by : Hans-Joachim Bungartz

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.

Flow Interaction with Highly Flexible Structures

Author : Kourosh Shoele
Publisher :
ISBN 13 : 9781124809069
Total Pages : 198 pages
Book Rating : 4.8/5 (9 download)

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Book Synopsis Flow Interaction with Highly Flexible Structures by : Kourosh Shoele

Download or read book Flow Interaction with Highly Flexible Structures written by Kourosh Shoele and published by . This book was released on 2011 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studying the interaction between fluid and structure is an essential step towards the understanding of many engineering and physical problems, from the flow instability of structures to the biolocomotion of insects, birds and fishes. The simulation of such problems is computationally challenging. This justifies the attempts to develop more sophisticated and more efficient numerical models of fluid-solid interactions. In this dissertation, we proposed numerical models both in potential flow and fully viscous flow for the interaction of immersed structure with a strongly unsteady flow. In particular we have developed efficient approaches to study two groups of problems, the flow interaction with skeleton-reinforced fish fins and flow interaction with highly flexible bluff bodies. Fins of bony fishes are characterized by a skeleton-reinforced membrane structure consisting of a soft collagen membrane strengthened by embedded flexible rays. Morphologically, each ray is connected to a group of muscles so that the fish can control the rotational motion of each ray individually, enabling multi-degree of freedom control over the fin motion and deformation. We have developed fluid-structure interaction models to simulate the kinematics and dynamic performance of a structurally idealized fin. The first method includes a boundary-element model of the fluid motion and a fully-nonlinear Euler-Bernoulli beam model of the embedded rays. In the second method, we use an improved immersed boundary approach. Using these models, we study thrust generation and propulsion efficiency of the fin at different combinations of parameters at both high-Re and intermediate-Re flow. Effects of kinematic as well as structural properties are examined. It has been illustrated that the fish's capacity to control the motion of each individual ray, as well as the anisotropic deformability of the fin determined by distribution of the rays (especially the detailed distribution of ray stiffness), is essential to high propulsion performance. We also note that this structural design is a recurring motif in nature. To understand flow-induced vibrations of deformable bluff objects, we study dynamics of a pressurized elastic ring within a uniform flow by using an immersed-boundary algorithm. The vibration of the flexible ring is decomposed into a pitching and flexible bending modes. Across the resonance region, nonlinear behavior of the ring is studied and the hydrodynamic loads are recorded. It is observed that within the resonance region, the lift force demonstrates a beating phenomenon reminiscent of findings from reduced models and low-degree-of-freedom systems.

On Modeling Fluid-structure Interaction

Author : Jose L. Ortiz
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis On Modeling Fluid-structure Interaction by : Jose L. Ortiz

Download or read book On Modeling Fluid-structure Interaction written by Jose L. Ortiz and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Experimental and Theoretical Study of Fluid-structure Interactions in Plunging Hydrofoils and Gravity-driven Falling Plates

Author : Ruijun Tian
Publisher :
ISBN 13 :
Total Pages : 218 pages
Book Rating : 4.:/5 (945 download)

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Book Synopsis Experimental and Theoretical Study of Fluid-structure Interactions in Plunging Hydrofoils and Gravity-driven Falling Plates by : Ruijun Tian

Download or read book Experimental and Theoretical Study of Fluid-structure Interactions in Plunging Hydrofoils and Gravity-driven Falling Plates written by Ruijun Tian and published by . This book was released on 2015 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two typical unsteady fluid-structure interaction problems have been investigated in the present study. One of them was about actively plunged flexible hydrofoil; the other was about gravity-driven falling plates in water. Real-time velocity field and dynamic response on the moving objects were measured to study these unsteady and highly nonlinear problems. For a long time, scientists have believed that bird and insect flight benefits greatly from the flexibility and morphing facility of their wings via flapping motion. A significant advantage flexible wing models have over quasi-steady rigid wing models is a much higher lift generation capability. Both experimental and computational studies have shown that the leading and trailing edge vortexes (LEX and TEV) play a major role in the efficient generation of such unconventionally high lift force. In this study, two NACA0012 miniature hydrofoils, one flexible and the other rigid, were actively plunged at various frequencies in a viscous glycerol-water solution to study the influence of flexibility. Two-dimensional, phase-locked particle image velocimetry (PIV) measurements were conducted to investigate the temporal and spacial development of LEVs and TEVs. Simultaneous measurements of lift and thrust forces were recorded to reveal the relationship between hydrodynamic force and the evolution of the surrounding flow field. Results from the flexible hydrofoil were compared to those from the rigid one in order to quantitatively analyze the effects of flexibility. The second problem focused on fluid-structure interaction of gravity driven falling plates. Falling leaves and paper cards in air has drawn plenty of research interest in the past decades to investigate the interaction between the fluid flow and the falling object. In this research, time-resolved PIV were employed to experimentally visualize the flow field evolution around the gravity-driven falling plates. The plates were made of different materials with various geometric dimensions, in order to investigate the effects of non-dimensional parameters such as Reynolds number (Re) and dimensionless moment of inertia (I*). Within the range of relative high Reynolds numbers (Re > 500), three types of falling modes were observed: i.e., periodic fluttering, periodic tumbling and marginal chaotic motion. It was found that the nondimensional moment of inertia controlled the falling mode. The flow features through the falling path of the plate were characterized and compared with their corresponding kinematics. Based on theoretical analysis and experimental results, a semi-analytical model was developed to calculate the real-time hydrodynamic force and moment applied on falling plates. With this model, the falling trajectory of 2D plates with arbitrary material/dimension combinations can be predicted. The model yielded a good match for both the dynamic force simulation and trajectory prediction.

Computational Modeling of Fluid-structure Interaction in Biological Flying and Swimming

Author : Hu Dai
Publisher :
ISBN 13 :
Total Pages : 148 pages
Book Rating : 4.:/5 (829 download)

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Book Synopsis Computational Modeling of Fluid-structure Interaction in Biological Flying and Swimming by : Hu Dai

Download or read book Computational Modeling of Fluid-structure Interaction in Biological Flying and Swimming written by Hu Dai and published by . This book was released on 2013 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

On the 3-dimensional Fluid-structure Interaction of Flexible Fibers in a Flow

Author : Ryan Howard Allaire
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (91 download)

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Book Synopsis On the 3-dimensional Fluid-structure Interaction of Flexible Fibers in a Flow by : Ryan Howard Allaire

Download or read book On the 3-dimensional Fluid-structure Interaction of Flexible Fibers in a Flow written by Ryan Howard Allaire and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Modeling Fluid Structure Interaction

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)

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Book Synopsis Modeling Fluid Structure Interaction by :

Download or read book Modeling Fluid Structure Interaction written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal goal of this program is on integrating experiments with analytical modeling to develop physics-based reduced-order analytical models of nonlinear fluid-structure interactions in articulated naval platforms. The critical research path for this effort is defined in the context of transitioning these models into engineering tools for design and analysis of existing and future marine systems. The symbiosis of analysis and experiments provides unique opportunities for advance the state-of-the-art in analytical modeling by directly addressing nonlinear coupling effects, and linking individual terms in the analysis to physical parameters measured in the laboratory. This research is also an excellent vehicle for training a new generation of workers who are adept at understanding fluid-structure interaction problems from both analytical dynamics and experimental fluid dynamics perspectives.

Two-way Fluid-structure Coupling Methodology for Modeling 3D Flexible Hydrofoils in Viscous Flow

Author : Zahra Mortazavinia
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (114 download)

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Book Synopsis Two-way Fluid-structure Coupling Methodology for Modeling 3D Flexible Hydrofoils in Viscous Flow by : Zahra Mortazavinia

Download or read book Two-way Fluid-structure Coupling Methodology for Modeling 3D Flexible Hydrofoils in Viscous Flow written by Zahra Mortazavinia and published by . This book was released on 2018 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lifting bodies, such as blades, wings, and hydrofoils, may be subject to instabilities, such as divergence, flutter, and resonance, which can fatigue the structure and reduce its operational longevity. Therefore, it is important to understand and accurately predict the response and stability of such structures to ensure their structural safety and facilitate the design and optimization of new and existing concepts. The interaction between fluid and structure, known as Fluid-Structure Interaction (FSI), should be taken into account in the study of elastic response and instabilities of flexible lifting bodies. In such applications, the fluid flow and structure are coupled through the loads exerted on the structure by the fluid, which results in the the structural deformation. In some FSI applications, fluid and solid can be coupled by one-way (unidirectional) load transfer. In this case, a given field may strongly affect, but not be affected significantly by the other field. However, for some practical engineering applications, in which there is a strong and potentially nonlinear relationship between the fields, one-way coupling is not adequate. In such cases, the structural displacement caused by the flow further enhances the fluid forces in such a way that both fluid and structure are interacting in a complex feedback fashion. Hence, two-way FSI analysis needs to be undertaken. Light-weight, flexible structures are widely used through recent advances in material technologies to improve hydrodynamic and structural performance compared to heavy and stiff materials. This project seeks to gain greater insight into the hydroelastic response of highly flexible hydrofoils, which undergo large deformation when subjected to high hydrodynamic loadings. This increases the necessity of incorporating strongly-coupled two-way FSI methodology in addition to the numerical challenges in mesh deformation modelling. At moderate to high Reynolds numbers, the development of turbulent flow around a hydrofoil causes a momentum transfer normal to the wall and allows the flow to re-attach, and form a Laminar Separation Bubble (LSB). Flow separation, formation of trailing edge vortices, location and movement of the LSB affect the hydrodynamic loading and structural vibration. Hence, an advanced numerical technique with sufficiently high spatial accuracy is incorporated in the present study to precisely capture these local interface phenomena, such as the onset and the amount of flow separation. The interaction between the foil and surrounding flow involve significant three-dimensional features that will not be neglected in the present study.

The Finite Element Method for Three-Dimensional Thermomechanical Applications

Author : Guido Dhondt
Publisher : John Wiley & Sons
ISBN 13 : 0470857625
Total Pages : 362 pages
Book Rating : 4.4/5 (78 download)

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Book Synopsis The Finite Element Method for Three-Dimensional Thermomechanical Applications by : Guido Dhondt

Download or read book The Finite Element Method for Three-Dimensional Thermomechanical Applications written by Guido Dhondt and published by John Wiley & Sons. This book was released on 2004-11-19 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Though many 'finite element' books exist, this book provides a unique focus on developing the method for three-dimensional, industrial problems. This is significant as many methods which work well for small applications fail for large scale problems, which generally: are not so well posed introduce stringent computer time conditions require robust solution techniques. Starting from sound continuum mechanics principles, derivation in this book focuses only on proven methods. Coverage of all different aspects of linear and nonlinear thermal mechanical problems in solids are described, thereby avoiding distracting the reader with extraneous solutions paths. Emphasis is put on consistent representation and includes the examination of topics which are not frequently found in other texts, such as cyclic symmetry, rigid body motion and nonlinear multiple point constraints. Advanced material formulations include anisotropic hyperelasticity, large strain multiplicative viscoplasticity and single crystal viscoplasticity. Finally, the methods described in the book are implemented in the finite element software CalculiX, which is freely available (www.calculix.de; the GNU General Public License applies). Suited to industry practitioners and academic researchers alike, The Finite Element Method for Three-Dimensional Thermomechanical Applications expertly bridges the gap between continuum mechanics and the finite element method.

Coupled Fluid-structure Interaction Modeling of a Parafoil

Author : Brandon Burnett
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (972 download)

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Book Synopsis Coupled Fluid-structure Interaction Modeling of a Parafoil by : Brandon Burnett

Download or read book Coupled Fluid-structure Interaction Modeling of a Parafoil written by Brandon Burnett and published by . This book was released on 2016 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the summer of 2014, Performance Designs, Inc. contacted Embry-Riddle Aeronautical University's Eagle Flight Research Center to lead an investigation on square parachute design and optimization using modern computational methods to reduce costs in experimental testing. This thesis investigates the foundation for using an implicit fluid-structure interaction computational model to tackle the challenges of modeling a highly-flexible, porous fabric for design optimization of a parafoil parachute's transient performance. Canopy deformations of a single-cell square parafoil using a fluid-structure interaction (FSI) model with nonlinear material modeling is compared to an experimental setup of matching geometry. The results of this thesis yielded a partial match of 24% between the experimental and FSI model deformations and thus asserts that fluid-structural model using ANSYS Multiphysics can be used to model square parachutes.

Numerical Study of Body Shape and Wing Flexibility in Fluid Structure Interaction

Author : Peter Nolan
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (91 download)

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Book Synopsis Numerical Study of Body Shape and Wing Flexibility in Fluid Structure Interaction by : Peter Nolan

Download or read book Numerical Study of Body Shape and Wing Flexibility in Fluid Structure Interaction written by Peter Nolan and published by . This book was released on 2015 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fluid Structure Interaction in Flexible Vessels

Author :
Publisher :
ISBN 13 :
Total Pages : 376 pages
Book Rating : 4.:/5 (94 download)

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Book Synopsis Fluid Structure Interaction in Flexible Vessels by :

Download or read book Fluid Structure Interaction in Flexible Vessels written by and published by . This book was released on 2005 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

An Introduction to the Theory of Aeroelasticity

Author : Y C Fung
Publisher : Courier Dover Publications
ISBN 13 : 0486469360
Total Pages : 516 pages
Book Rating : 4.4/5 (864 download)

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Book Synopsis An Introduction to the Theory of Aeroelasticity by : Y C Fung

Download or read book An Introduction to the Theory of Aeroelasticity written by Y C Fung and published by Courier Dover Publications. This book was released on 2008-10-17 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geared toward advanced undergraduates and graduate students, this outstanding text surveys aeroelastic problems, their historical background, basic physical concepts, and the principles of analysis.

A Modern Course in Aeroelasticity

Author : E.H. Dowell
Publisher : Springer Science & Business Media
ISBN 13 : 9401104999
Total Pages : 724 pages
Book Rating : 4.4/5 (11 download)

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Book Synopsis A Modern Course in Aeroelasticity by : E.H. Dowell

Download or read book A Modern Course in Aeroelasticity written by E.H. Dowell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeroelasticity is the study of flexible structures situated in a flowing fluid. Its modern origins are in the field of aerospace engineering, but it has now expanded to include phenomena arising in other fields such as bioengineering, civil engineering, mechanical engineering and nuclear engineering. The present volume is a teaching text for a first, and possibly second, course in aeroelasticity. It will also be useful as a reference source on the fundamentals of the subject for practitioners. In this third edition, several chapters have been revised and three new chapters added. The latter include a brief introduction to `Experimental Aeroelasticity', an overview of a frontier of research `Nonlinear Aeroelasticity', and the first connected, authoritative account of `Aeroelastic Control' in book form. The authors are drawn from a range of fields including aerospace engineering, civil engineering, mechanical engineering, rotorcraft and turbomachinery. Each author is a leading expert in the subject of his chapter and has many years of experience in consulting, research and teaching.

An Introduction to Flapping Wing Aerodynamics

Author : Wei Shyy
Publisher : Cambridge University Press
ISBN 13 : 1107067987
Total Pages : 321 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis An Introduction to Flapping Wing Aerodynamics by : Wei Shyy

Download or read book An Introduction to Flapping Wing Aerodynamics written by Wei Shyy and published by Cambridge University Press. This book was released on 2013-08-19 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an ideal book for graduate students and researchers interested in the aerodynamics, structural dynamics and flight dynamics of small birds, bats and insects, as well as of micro air vehicles (MAVs), which present some of the richest problems intersecting science and engineering. The agility and spectacular flight performance of natural flyers, thanks to their flexible, deformable wing structures, as well as to outstanding wing, tail and body coordination, is particularly significant. To design and build MAVs with performance comparable to natural flyers, it is essential that natural flyers' combined flexible structural dynamics and aerodynamics are adequately understood. The primary focus of this book is to address the recent developments in flapping wing aerodynamics. This book extends the work presented in Aerodynamics of Low Reynolds Number Flyers (Shyy et al. 2008).