On The Combined Performance Of Non Local Artificial Boundary Conditions With The New Generation Of Advanced Multigrid Flow Solvers
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On The Combined Performance Of Non Local Artificial Boundary Conditions With The New Generation Of Advanced Multigrid Flow Solvers
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Author : T. W. Roberts
language : en
Publisher:
Release Date : 2000
On The Combined Performance Of Non Local Artificial Boundary Conditions With The New Generation Of Advanced Multigrid Flow Solvers written by T. W. Roberts and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Aerodynamics categories.
We develop theoretically and implement numerically a unified flow solution methodology that combines the advantages relevant to two independent groups of methods in CFD that have recently proven successful: The new factorizable schemes for the equations of hydrodynamics that facilitate the construction of optimally convergent multigrid algorithms, and highly accurate global far-field artificial boundary conditions (ABCs). The primary result that we have obtained is the following. Global ABCs do not hamper the optimal (i.e., unimprovable) multigrid convergence rate pertinent to the solver. At the same time, contrary to the standard local ABCs, the solution accuracy provided by the global ABCs deteriorates very slightly or does not deteriorate at all when the computational domain shrinks, which clearly translates into substantial savings of computer resources.
Quadratic Optimization In The Problems Of Active Control Of Sound
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Author : Josip Lončarić
language : en
Publisher: DIANE Publishing
Release Date : 2002
Quadratic Optimization In The Problems Of Active Control Of Sound written by Josip Lončarić and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Recent Advances In Achieving Textbook Multigrid Efficiency For Computational Fluid Dynamics Simulations
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Author : Achi Brandt
language : en
Publisher:
Release Date : 2002
Recent Advances In Achieving Textbook Multigrid Efficiency For Computational Fluid Dynamics Simulations written by Achi Brandt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Recent advances in achieving textbook multigrid efficiency for fluid simulations are presented. Textbook multigrid efficiency is defined as attaining the solution to the governing system of equations in a computational work which is a small multiple of the operation counts associated with discretizing the system. Strategies are reviewed to attain this efficiency by exploiting the factorizability properties inherent to a range of fluid simulations, including the compressible Navier-Stokes equations. factorizability is used to separate the elliptic and hyperbolic factors contributing to the target system; each of the factors can then be treated individually and optimally. Boundary regions and discontinuities are addressed with separate (local) treatments. New formulations and recent calculations demonstrating the attainment of textbook efficiency for aerodynamic simulations are shown.
Nasa Langley Scientific And Technical Information Output 2000
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Author :
language : en
Publisher:
Release Date : 2001
Nasa Langley Scientific And Technical Information Output 2000 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Mechanics
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Author :
language : en
Publisher:
Release Date : 2002
Mechanics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Mechanics, Applied categories.
Activities Of Institute For Computer Applications In Science And Engineering Icase
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Author :
language : en
Publisher:
Release Date : 2001
Activities Of Institute For Computer Applications In Science And Engineering Icase written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Optimization Of Acoustic Source Strength In The Problems Of Active Noise Control
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Author : Josip Lončarić
language : en
Publisher:
Release Date : 2002
Optimization Of Acoustic Source Strength In The Problems Of Active Noise Control written by Josip Lončarić and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Noise control categories.
We consider a problem of eliminating the unwanted time-harmonic noise on a predetermined region of interest. The desired objective is achieved by active means, i.e., by introducing additional sources of sound called control sources, that generate the appropriate annihilating acoustic signal (anti-sound). A general solution for the control sources has been obtained previously in both continuous and discrete formulation of the problem. In the current paper, we focus on optimizing the overall absolute acoustic source strength of the control sources. Mathematically, this amounts to the minimization of multi-variable complex-valued functions in the sense of L1 with conical constraints, which are only 'marginally' convex. The corresponding numerical optimization problem appears very challenging even for the most sophisticated state-of-the-art methodologies, and even when the dimension of the grid is small, and the waves are long. Our central result is that the global L1-optimal solution can, in fact, be obtained without solving the numerical optimization problem. This solution is given by a special layer of monopole sources on the perimeter of the protected region. We provide a rigorous proof of the global L1 minimality for both continuous and discrete optimization problems in the one-dimensional case. We also provide numerical evidence that corroborates our result in the two-dimensional case, when the protected domain is a cylinder. Even though we cannot fully justify it, we believe that the same result holds in the general case, i.e., for multi-dimensional settings and domains of arbitrary shape. We formulate it as a conjecture at the end of the paper.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1989
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aeronautics categories.
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1999
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Aeronautics categories.
Aeronautical Engineering A Cumulative Index To A Continuing Bibliography Supplement 300
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Author :
language : en
Publisher:
Release Date : 1994
Aeronautical Engineering A Cumulative Index To A Continuing Bibliography Supplement 300 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.