Download or read book Recent Advances in Transonic Computational Aeroelasticity written by and published by . This book was released on 1988 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent advances in computational transonic aerodynamics written by Jerry C. South and published by . This book was released on 1985 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Computational Aeroelasticity written by Min Xu and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-12-07 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a state-of-art overview of computational methods for nonlinear aeroelasticity and load analysis, focusing on key techniques and fundamental principles for CFD/CSD coupling in temporal domain. CFD/CSD coupling software design and applications of CFD/CSD coupling techniques are discussed in detail as well. It is an essential reference for researchers and students in mechanics and applied mathematics.

Download or read book Computational Structural Mechanics Fluid Dynamics written by A.K. Noor and published by Elsevier. This book was released on 2013-10-22 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational structural mechanics (CSM) and computational fluid dynamics (CFD) have emerged in the last two decades as new disciplines combining structural mechanics and fluid dynamics with approximation theory, numerical analysis and computer science. Their use has transformed much of theoretical mechanics and abstract science into practical and essential tools for a multitude of technological developments which affect many facets of our life. This collection of over 40 papers provides an authoritative documentation of major advances in both CSM and CFD, helping to identify future directions of development in these rapidly changing fields. Key areas covered are fluid structure interaction and aeroelasticity, CFD technology and reacting flows, micromechanics, stability and eigenproblems, probabilistic methods and chaotic dynamics, perturbation and spectral methods, element technology (finite volume, finite elements and boundary elements), adaptive methods, parallel processing machines and applications, and visualization, mesh generation and artificial intelligence interfaces.

Download or read book Transonic Aerodynamics Past Progress and Current Status written by Max Franz Platzer and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents a brief summary of the past progress, current status and development trends of transonic aerodynamics. The main methods to compute steady and unsteady transonic flows are reviewed. Also, recent advances in transonic buffet prediction and transonic airfoil design are summarized and attention is drawn to problems requiring further intensive research efforts. (Author).

Download or read book An Overview of Recent Developments in Computational Aeroelasticity written by Robert M. Bennett and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current Status of Computational Methods for Transonic Unsteady Aerodynamics and Aeroelastic Applications written by and published by . This book was released on 1992 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Application of finite elements for computational aeroelasticity written by Ralf Unger and published by Cuvillier Verlag. This book was released on 2011-10-19 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, a coupled multiphysical system is considered, whereas the focus is upon aeroelastic problems. For a consistent formulation of such coupled systems, an energy based variational formulation is chosen to describe initially the structural and fluid subsystem by Hamilton’s principle. Both basic fluid model equations - inviscid and viscous fluid models - are employed by this weak variational energy principle. This procedure allows to describe the coupled problem by the classical direct two-field approach as well as by a novel indirect three-field approach. To discretize the entire system consistently with finite elements, the CBS scheme is employed for the fluid domain described by the Navier-Stokes equation in ALE frame of reference. This allows the fluid domain to be temporally deformable, which is essential for aeroelastic computations. The CBS scheme is verified for a wide range of typical fluid problems ranging from inviscid, viscous, incompressible and turbulent flows. A good agreement with data published in literature and with the further solver TAU are found, which underlines the applicability of the CBS scheme for different fluid flow models. The DG-CBS scheme as a novel and attractive approach has been derived from the continuous version. One important advantage of the DG version is the design of the element edge flux to be locally conservative. For the example of the laminar flow over the NACA0012 airfoil as well as for the panel flutter problem, a comparison of the CBS and DG-CBS scheme is made on structured fluid grids including grid convergence studies. With biquadratic, more accurate results in terms of the flutter frequency are obtained with DG-CBS scheme. Moreover, no global system of linear equations needs to be solved at the computational expense of addidtional element edge flux calculations with the DG version. This might be attractive for fluid grids with a high number of degrees of freedom. Consequently, the whole coupled system is further discretized with finite elements including the structural subdomain, the deformation of the fluid grid and the transfer scheme. For the fluid grid deformation, it is found, that all of the presented stiffness evaluation methods perform similarly. The stiffness strategy based on the wall distance and the characteristic length is recommended to be used for the simple testcases with the unstructured grid. For a structured grid around an airfoil, the best grids are obtained with the stiffness methods based on the wall distance. Thus, for general fluid grid deformations, the method, which use a combination of the wall distance and the characteristic length, can be recommended and is hence applied for the panel flutter problem. Based on the unified weak variational coupling schemes, several data transfer schemes are introduced, which share the property of load and energy conservation. With a h-refinement of the integration grid, a significant reduction of the transfer error is observed for low-curved interface meshes. The decrease of the transfer error is limited by the facetting error, which is identified for highly curved interface meshes and for a realistic wing configuration. For the panel flutter problem at Ma∞ = 1.0 and rp = 170, the Galerkin and the dual-Lagrange based transfer as well as the conservative interpolation gives similar results in terms of the frequency and amplitude of the LCO. With its local accuracy together with a global load conservation property and due to the efficiency of a matrix-free transfer scheme, the dual-Lagrange based transfer is an attractive approach for the data transmission of the coupled system. A smooth transfer scheme is proposed, which uses the novel three-field coupling approach with a higher spatial order discretization of the connectivity frame. Regarding the time integration and equilibrium iteration, the three-field approach is assessed for a strongly coupled problem. With the use of the Newton-GMRES iteration scheme, the number of DN cycles is reduced for the three-field approach. Moreover, the same coupling matrices are identified for the three-field approach, which alreay appeared within the iteration process of two-field approach. This allows the application of a simple staggered time integration scheme for the panel flutter problem. The comparison of the two- and three-field approach shows that both, the frequency and the amplitude of the LCO, are only marginally affected. However, the smooth data transfer leads to a clean fluid solution without artificial shocks, which has been observed with the two-field approach and a small number structural elements at the interface. Furthermore, a consistent time integration approach for the structure is proposed, so that both subsystems use the same temporal discretization. Here, similar results in terms of the LCO’s frequency and amplitude are obtained, when the Newmark or the consistent three-point backward difference scheme for the structural time integration of the panel is applied. Thus, the panel flutter problem using a simple staggered time integration scheme with the consistent time integration for the fluid and structural subsystem and with the proposed three-field approach could be analyzed in detail running numerous simulations. At subsonic flow conditions, the panel shows a static deflection behavior in up- or downward direction depending on Ma∞ and rp, but indepentent of rm. On the other hand, the panel exhibits a LCO and the critical values of the dynamic pressure strongly depend on the mass ratio. For low values of rm, a supersonic dip in the stability boundary is observed. It is shown, that the frequency of the LCO increases with increasing Mach number, dynamic pressure and mass ratio. Moreover, a linear dependency between the frequency and the amplitude of the LCO for high mass ratios and low Mach numbers is found. Turbulence modeling with the aid of the CBS scheme in the context of an aeroelastic problem is employed in this thesis. The Spalart-Allmaras turbulence model in conjunction with the CBS scheme is primarily verified with data found in literature and with the flowsolver TAU for pure compressible fluid flow over an airfoil. For the panel flutter problem, the turbulent boundary layer leads to an additional damping behavior. The frequency of the LCO is unaffected by the Reynolds number, but a dependency regarding Re is noticed for the amplitude and the mean deformation. Finally, a strong shift of the critical dynamic pressure to higher values could be observed for the stability chart, which is caused by the damping influence. Subsequent work regarding this thesis certainly involves the investigation of the panel flutter phenomenon in three dimensions. This is motivated by the good performance of the CBS scheme in 3D found in literature. Another topic, which should be considered further, is the application of the three-field coupling approach for more than two subdomains, e.g. fluid-fluid-structure or fluid-structure-structure interaction. In this context, the performance of the presented coupling scheme in conjunction with an incompressible fluid could be a subject for research. Herein, the avoidance of the added mass effect due to an artificial compressibility within the CBS scheme is an interesting aspect. Moreover, attempts to improve the standard finite element methodology by a NURBS based isogeometric analysis can be observed in literature, see [CHB09] and the references therein. A NURBS based coupling scheme is a straightforward enhancement to the present methodology. Further, an adaptive refinement - mesh, polynomial, or a combination of both - is surely an attractive approach to improve the accuracy of the methodology. Finally, from the CFD point of view, more precise numerical methods were established and thus, the CBS scheme could be enhanced with a transition prediction scheme as well as with a large or detached eddy simulation (LES/DES) methodology to capture more complex fluid flow phenomena.

Download or read book Nonlinear Phenomena in Computational Transonic Aeroelasticity written by Kenneth A. Kousen and published by . This book was released on 1989 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Modern Course in Aeroelasticity written by E.H. Dowell and published by Springer. This book was released on 1995 with total page 768 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.

Download or read book A Modern Course in Aeroelasticity written by Howard C. Curtiss Jr. and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: Areader who achieves a substantial command of the material con tained in this book should be able to read with understanding most of the literature in the field. Possible exceptions may be certain special aspects of the subject such as the aeroelasticity of plates and sheIls or the use of electronic feedback control to modify aeroelastic behavior. The first author has considered the former topic in aseparate volume. The latter topic is also deserving of aseparate volume. In the first portion of the book the basic physical phenomena of divergence, control surface eflectiveness, flutter and gust response of aeronautical vehicles are treated. As an indication of the expanding scope of the field, representative examples are also drawn from the non aeronautical literature. To aid the student who is encountering these phenomena for the first time, each is introduced in the context of a simple physical model and then reconsidered systematicaIly in more compli cated models using more sophisticated mathematics.

Download or read book A Modern Course in Aeroelasticity written by Robert Clark and published by Springer Science & Business Media. This book was released on 2006-01-24 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this new edition, the fundamental material on classical linear aeroelasticity has been revised. Also new material has been added describing recent results on the research frontiers dealing with nonlinear aeroelasticity as well as major advances in the modelling of unsteady aerodynamic flows using the methods of computational fluid dynamics and reduced order modeling techniques. New chapters on aeroelasticity in turbomachinery and aeroelasticity and the latter chapters for a more advanced course, a graduate seminar or as a reference source for an entrée to the research literature.

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.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1989 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heterogeneous Computing Multidisciplinary Applications written by Nobuhiko Koike and published by SIAM. This book was released on 2000-01-01 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This symposium brought together technology providers, application program developers, and industrial users of high performance computing systems. The articles address the current and future developments of computing systems for numerical simulation seen from these various viewpoints. The main issues raised include these questions: