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A Combined Finite Element And Boundary Integral Formulation For Solution Via Cgfft Of 2 Dimensional Scattering Problems
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722891985 Total Pages :154 pages Book Rating :4.8/5 (919 download)
Book Synopsis A Combined Finite Element and Boundary Integral Formulation for Solution Via Cgfft of 2-Dimensional Scattering Problems by : National Aeronautics and Space Administration (NASA)
Download or read book A Combined Finite Element and Boundary Integral Formulation for Solution Via Cgfft of 2-Dimensional Scattering Problems written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new technique is presented for computing the scattering by 2-D structures of arbitrary composition. The proposed solution approach combines the usual finite element method with the boundary integral equation to formulate a discrete system. This is subsequently solved via the conjugate gradient (CG) algorithm. A particular characteristic of the method is the use of rectangular boundaries to enclose the scatterer. Several of the resulting boundary integrals are therefore convolutions and may be evaluated via the fast Fourier transform (FFT) in the implementation of the CG algorithm. The solution approach offers the principle advantage of having O(N) memory demand and employs a 1-D FFT versus a 2-D FFT as required with a traditional implementation of the CGFFT algorithm. The speed of the proposed solution method is compared with that of the traditional CGFFT algorithm, and results for rectangular bodies are given and shown to be in excellent agreement with the moment method. Collins, Jeffery D. and Volakis, John L. Unspecified Center BOUNDARY INTEGRAL METHOD; FAST FOURIER TRANSFORMATIONS; FINITE ELEMENT METHOD; WAVE SCATTERING; ALGORITHMS; COMPUTATIONAL GRIDS; COMPUTER SYSTEMS PERFORMANCE; MEMORY (COMPUTERS); METHOD OF MOMENTS; WAVE EQUATIONS...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722128135 Total Pages :56 pages Book Rating :4.1/5 (281 download)
Book Synopsis A Combined Finite Element-Boundary Element Formulation for Solution of Two-Dimensional Problems Via Cgfft by : National Aeronautics and Space Administration (NASA)
Download or read book A Combined Finite Element-Boundary Element Formulation for Solution of Two-Dimensional Problems Via Cgfft written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-13 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for the computation of electromagnetic scattering from arbitrary two-dimensional bodies is presented. The method combines the finite element and boundary element methods leading to a system for solution via the conjugate gradient Fast Fourier Transform (FFT) algorithm. Two forms of boundaries aimed at reducing the storage requirement of the boundary integral are investigated. It is shown that the boundary integral becomes convolutional when a circular enclosure is chosen, resulting in reduced storage requirement when the system is solved via the conjugate gradient FFT method. The same holds for the ogival enclosure, except that some of the boundary integrals are not convolutional and must be carefully treated to maintain O(N) memory requirement. Results for several circular and ogival structures are presented and shown to be in excellent agreement with those obtained by traditional methods. Collins, Jeffery D. and Jin, Jian-Ming and Volakis, John L. Unspecified Center...
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 1990 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1991 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :IEEE Antennas and Propagation Society Publisher :Institute of Electrical & Electronics Engineers(IEEE) ISBN 13 : Total Pages :560 pages Book Rating :4.F/5 ( download)
Book Synopsis Finite Elements for Wave Electromagnetics by : IEEE Antennas and Propagation Society
Download or read book Finite Elements for Wave Electromagnetics written by IEEE Antennas and Propagation Society and published by Institute of Electrical & Electronics Engineers(IEEE). This book was released on 1994 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1991 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Semi-Annual Report For NASA Grant NAG-2-541 by : NASA
Download or read book Semi-Annual Report For NASA Grant NAG-2-541 written by NASA and published by . This book was released on with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Electromagnetic Fields in Living Systems by : James C. Lin
Download or read book Advances in Electromagnetic Fields in Living Systems written by James C. Lin and published by Springer Science & Business Media. This book was released on 1994 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 2 in this series offers research into two specific regions of the electromagnetic spectrum: extremely low frequency fields and radiofrequency radiation, with particular emphasis on the latter. The investigations explore: melatonin synthesis and exposure to extremely low frequency (ELF) fields ELF fields and cancer computational bioelectromagnetics health effects, including the carcinogenic potential of radiofrequency radiation radiofrequency radiation as an energy source for arrhythmia, and practical applications of the radiofrequency exposure standard.
Book Synopsis APPLICATIONS OF THE CONJUGATE GRADIENT FFT METHOD IN SCATTERING AND RADIATION INCLUDING SIMULATIONS WITH IMPEDANCE BOUNDARY CONDITIONS. by : KASRA BARKESHLI
Download or read book APPLICATIONS OF THE CONJUGATE GRADIENT FFT METHOD IN SCATTERING AND RADIATION INCLUDING SIMULATIONS WITH IMPEDANCE BOUNDARY CONDITIONS. written by KASRA BARKESHLI and published by . This book was released on 1991 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: finite number of steps. Moreover, since the CGFFT algorithm is highly vectorizable, it can be efficiently implemented on supercomputers and multiprocessor machines.
Book Synopsis user mannual for automesh-2d by : chongyu hua
Download or read book user mannual for automesh-2d written by chongyu hua and published by . This book was released on with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Electromagnetics and Its Applications by : Thomas G. Campbell
Download or read book Computational Electromagnetics and Its Applications written by Thomas G. Campbell and published by Springer. This book was released on 1997-09-30 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the first ICASE/LaRC Work shop on Computational Electromagnetics and Its Applications conducted by the Institute for Computer Applications in Science and Engineering and NASA Langley Research Center. We had several goals in mind when we decided, jointly with the Elec tromagnetics Research Branch, to organize this workshop on Computa tional Electromagnetics ( CEM). Among our goals were a desire to obtain an overview of the current state of CEM, covering both algorithms and ap plications and their effect on NASA's activities in this area. In addition, we wanted to provide an attractive setting for computational scientists with expertise in other fields, especially computational fluid dynamics (CFD), to observe the algorithms and tools of CEM at work. Our expectation was that scientists from both fields would discover mutually beneficial inter connections and relationships. Another goal was to learn of progress in solution algorithms for electromagnetic optimization and design problems; such problems make extensive use of field solvers and computational effi ciency is at a premium. To achieve these goals we assembled the renowned group of speakers from academia and industry whose talks are contained in this volume. The papers are printed in the same order in which the talks were pre sented at the meeting. The first paper is an overview of work currently being performed in the Electromagnetic Research Branch at the Langley Research Center.
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1991 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Software for Microwave Engineering by : Tatsuo Itoh
Download or read book Finite Element Software for Microwave Engineering written by Tatsuo Itoh and published by Wiley-Interscience. This book was released on 1996-08-23 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite element methods have become essential design tools for managing the complex structures and devices needed in modern microwave technology. Long the preferred techniques of both researchers and engineers, their migration from research lab to routine industrial use has been accelerated by hardware and software improvements. The last decade has seen the widespread availability of good commercial finite element programs for an extensive range of applications. Finite Element Software for Microwave Engineering provides the first comprehensive overview of this burgeoning field. With its unique focus on current and future industrial applications rather than on mathematical methodology, this book is an invaluable complement to the existing literature on finite element methods. Directed to practicing engineers and researchers, the book describes user experience with current software, shows how existing programs can be used to solve problems not foreseen by their designers, and attempts to predict which methods may appear in the commercial products of tomorrow.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis TECHNICAL REPORT FOR NASA Grant NAG-2-541 by :
Download or read book TECHNICAL REPORT FOR NASA Grant NAG-2-541 written by and published by . This book was released on with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Combined Finte Element-Boundary Element Formulation for Solution of Axially Symmetric Bodies by : JEFFERY D. COLLINS, JOHN L. VOLAKIS
Download or read book A Combined Finte Element-Boundary Element Formulation for Solution of Axially Symmetric Bodies written by JEFFERY D. COLLINS, JOHN L. VOLAKIS and published by . This book was released on with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1991 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
