Aerodynamic Design On Unstructured Grids For Turbulent Flows... NASA-TM-112867... Oct. 31. 1997 PDF Download
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725072091
Category :
Languages : en
Pages : 28
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Book Description
An aerodynamic design algorithm for turbulent flows using unstructured grids is described. The current approach uses adjoint (costate) variables for obtaining derivatives of the cost function. The solution of the adjoint equations is obtained using an implicit formulation in which the turbulence model is fully coupled with the flow equations when solving for the costate variables. The accuracy of the derivatives is demonstrated by comparison with finite-difference gradients and a few example computations are shown. In addition, a user interface is described which significantly reduces the time required for setting up the design problems. Recommendations on directions of further research into the Navier Stokes design process are made. Anderson, W. Kyle and Bonhaus, Daryl L. Langley Research Center NASA-TM-112867, NAS 1.15:112867 RTOP 522-31-21-01...
Author: W. Kyle Anderson
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792674853
Category :
Languages : en
Pages : 32
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Book Description
The current status of the development of unstructured grid methods in the Unsteady Aerodynamics Branch at NASA-Langley is described. These methods are being developed for steady and unsteady aerodynamic applications. The flow solvers that were developed for the solution of the unsteady Euler and Navier-Stokes equations are highlighted and selected results are given which demonstrate various features of the capability. The results demonstrate 2-D and 3-D applications for both steady and unsteady flows. Comparisons are also made with solutions obtained using a structured grid code and with experimental data to determine the accuracy of the unstructured grid methodology. These comparisons show good agreement which thus verifies the accuracy. Batina, John T. Langley Research Center NASA-TM-102730, NAS 1.15:102730, ICAS-90-6.9.4 RTOP 505-63-50-12...
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781792957154
Category :
Languages : en
Pages : 30
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Book Description
The current status of unstructured grid methods development in the Unsteady Aerodynamics Branch at NASA-Langley is described. These methods are being developed for unsteady aerodynamic and aeroelastic analyses. The flow solvers are highlighted which were developed for the solution of the unsteady Euler equations and selected results are given which show various features of the capability. The results demonstrate 2-D and 3-D applications for both steady and unsteady flows. Comparisons are also made with solutions obtained using a structured grid code and with experimental data to determine the accuracy of the unstructured grid methodology. These comparisons show good agreement which thus verifies the accuracy. Batina, John T. and Lee, Elizabeth M. and Kleb, William L. and Rausch, Russ D. Langley Research Center NASA-TM-104143, NAS 1.15:104143 RTOP 509-10-02-03...
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Author: American Institute of Aeronautics and Astronautics
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 896
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Book Description
Author: B. Kawohl
Publisher: Springer Science & Business Media
ISBN: 9783540679714
Category : Mathematics
Languages : en
Pages : 404
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Book Description
Optimal Shape Design is concerned with the optimization of some performance criterion dependent (besides the constraints of the problem) on the "shape" of some region. The main topics covered are: the optimal design of a geometrical object, for instance a wing, moving in a fluid; the optimal shape of a region (a harbor), given suitable constraints on the size of the entrance to the harbor, subject to incoming waves; the optimal design of some electrical device subject to constraints on the performance. The aim is to show that Optimal Shape Design, besides its interesting industrial applications, possesses nontrivial mathematical aspects. The main theoretical tools developed here are the homogenization method and domain variations in PDE. The style is mathematically rigorous, but specifically oriented towards applications, and it is intended for both pure and applied mathematicians. The reader is required to know classical PDE theory and basic functional analysis.
Author: O. Pironneau
Publisher: Springer Science & Business Media
ISBN: 3642877222
Category : Science
Languages : en
Pages : 179
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Book Description
The study of optimal shape design can be arrived at by asking the following question: "What is the best shape for a physical system?" This book is an applications-oriented study of such physical systems; in particular, those which can be described by an elliptic partial differential equation and where the shape is found by the minimum of a single criterion function. There are many problems of this type in high-technology industries. In fact, most numerical simulations of physical systems are solved not to gain better understanding of the phenomena but to obtain better control and design. Problems of this type are described in Chapter 2. Traditionally, optimal shape design has been treated as a branch of the calculus of variations and more specifically of optimal control. This subject interfaces with no less than four fields: optimization, optimal control, partial differential equations (PDEs), and their numerical solutions-this is the most difficult aspect of the subject. Each of these fields is reviewed briefly: PDEs (Chapter 1), optimization (Chapter 4), optimal control (Chapter 5), and numerical methods (Chapters 1 and 4).
Author: Hermann Glauert
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 246
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Book Description
