Download or read book Efficient Large Electromagnetic Simulation Based on Hybrid TLM and Modal Approach on Grid Computing and Supercomputer written by Mihai Alexandru and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of Information Communications Technology (ICT), the major challenge is to create systems increasingly small, boarding more and more intelligence, hardware and software, including complex communicating architectures. This requires robust design methodologies to reduce the development cycle and prototyping phase. Thus, the design and optimization of physical layer communication is paramount. The complexity of these systems makes them difficult to optimize, because of the explosion in the number of unknown parameters. The methods and tools developed in past years will be eventually inadequate to address problems that lie ahead. Communicating objects will be very often integrated into cluttered environments with all kinds of metal structures and dielectric larger or smaller sizes compared to the wavelength. The designer must anticipate the presence of such barriers in the propagation channel to establish properly link budgets and an optimal design of the communicating object. For example, the wave propagation in an airplane cabin from sensors or even an antenna, towards the cockpit is greatly affected by the presence of the metal structure of the seats inside the cabin or even the passengers. So, we must absolutely take into account this perturbation to predict correctly the power balance between the antenna and a possible receiver. More generally, this topic will address the theoretical and computational electromagnetics in order to propose an implementation of informatics tools for the rigorous calculation of electromagnetic scattering inside very large structures or radiation antenna placed near oversized objects. This calculation involves the numerical solution of very large systems inaccessible by traditional resources. The solution will be based on grid computing and supercomputers. Electromagnetic modeling of oversized structures by means of different numerical methods, using new resources (hardware and software) to realize yet more performant calculations, is the aim of this work. The numerical modeling is based on a hybrid approach which combines Transmission-Line Matrix (TLM) and the mode matching methods. The former is applied to homogeneous volumes while the latter is used to describe complex planar structures. In order to accelerate the simulation, a parallel implementation of the TLM algorithm in the context of distributed computing paradigm is proposed. The subdomain of the structure which is discretized upon TLM is divided into several parts called tasks, each one being computed in parallel by different processors. To achieve this, the tasks communicate between them during the simulation by a message passing library. An extension of the modal approach to various modes has been developped by increasing the complexity of the planar structures. The results prove the benefits of the combined grid computing and hybrid approach to solve electrically large structures, by matching the size of the problem with the number of computing resources used. The study highlights the role of parallelization scheme, cluster versus grid, with respect to the size of the problem and its repartition. Moreover, a prediction model for the computing performances on grid, based on a hybrid approach that combines a historic-based prediction and an application profile-based prediction, has been developped. The predicted values are in good agreement with the measured values. The analysis of the simulation performances has allowed to extract practical rules for the estimation of the required resources for a given problem. Using all these tools, the propagation of the electromagnetic field inside a complex oversized structure such an airplane cabin, has been performed on grid and also on a supercomputer. The advantages and disadvantages of the two environments are discussed.
Download or read book Multigrid Finite Element Methods for Electromagnetic Field Modeling written by Yu Zhu and published by John Wiley & Sons. This book was released on 2006-03-10 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first comprehensive monograph that features state-of-the-art multigrid methods for enhancing the modeling versatility, numerical robustness, and computational efficiency of one of the most popular classes of numerical electromagnetic field modeling methods: the method of finite elements. The focus of the publication is the development of robust preconditioners for the iterative solution of electromagnetic field boundary value problems (BVPs) discretized by means of finite methods. Specifically, the authors set forth their own successful attempts to utilize concepts from multigrid and multilevel methods for the effective preconditioning of matrices resulting from the approximation of electromagnetic BVPs using finite methods. Following the authors' careful explanations and step-by-step instruction, readers can duplicate the authors' results and take advantage of today's state-of-the-art multigrid/multilevel preconditioners for finite element-based iterative electromagnetic field solvers. Among the highlights of coverage are: * Application of multigrid, multilevel, and hybrid multigrid/multilevel preconditioners to electromagnetic scattering and radiation problems * Broadband, robust numerical modeling of passive microwave components and circuits * Robust, finite element-based modal analysis of electromagnetic waveguides and cavities * Application of Krylov subspace-based methodologies for reduced-order macromodeling of electromagnetic devices and systems * Finite element modeling of electromagnetic waves in periodic structures The authors provide more than thirty detailed algorithms alongside pseudo-codes to assist readers with practical computer implementation. In addition, each chapter includes an applications section with helpful numerical examples that validate the authors' methodologies and demonstrate their computational efficiency and robustness. This groundbreaking book, with its coverage of an exciting new enabling computer-aided design technology, is an essential reference for computer programmers, designers, and engineers, as well as graduate students in engineering and applied physics.
Download or read book Computational Electromagnetics Retrospective and Outlook written by Iftikhar Ahmed and published by Springer. This book was released on 2014-08-27 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book will cover the past, present and future developments of field theory and computational electromagnetics. The first two chapters will give an overview of the historical developments and the present the state-of-the-art in computational electromagnetics. These two chapters will set the stage for discussing recent progress, new developments, challenges, trends and major directions in computational electromagnetics with three main emphases: a. Modeling of ever larger structures with multi-scale dimensions and multi-level descriptions (behavioral, circuit, network and field levels) and transient behaviours b. Inclusions of physical effects other than electromagnetic: quantum effects, thermal effects, mechanical effects and nano scale features c. New developments in available computer hardware, programming paradigms (MPI, Open MP, CUDA and Open CL) and the associated new modeling approaches These are the current emerging topics in the area of computational electromagnetics and may provide readers a comprehensive overview of future trends and directions in the area. The book is written for students, research scientists, professors, design engineers and consultants who engaged in the fields of design, analysis and research of the emerging technologies related to computational electromagnetics, RF/microwave, optimization, new numerical methods, as well as accelerator simulator, dispersive materials, nano-antennas, nano-waveguide, nano-electronics, terahertz applications, bio-medical and material sciences. The book may also be used for those involved in commercializing electromagnetic and related emerging technologies, sensors and the semiconductor industry. The book can be used as a reference book for graduates and post graduates. It can also be used as a text book for workshops and continuing education for researchers and design engineers.
Download or read book Electromagnetic Modeling and Simulation written by Levent Sevgi and published by John Wiley & Sons. This book was released on 2014-03-13 with total page 665 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book presents simple, easy-to-use, but effective short codes as well as virtual tools that can be used by electrical, electronic, communication, and computer engineers in a broad range of electrical engineering problems Electromagnetic modeling is essential to the design and modeling of antenna, radar, satellite, medical imaging, and other applications. In this book, author Levent Sevgi explains techniques for solving real-time complex physical problems using MATLAB-based short scripts and comprehensive virtual tools. Unique in coverage and tutorial approach, Electromagnetic Modeling and Simulation covers fundamental analytical and numerical models that are widely used in teaching, research, and engineering designs—including mode and ray summation approaches with the canonical 2D nonpenetrable parallel plate waveguide as well as FDTD, MoM, and SSPE scripts. The book also establishes an intelligent balance among the essentials of EM MODSIM: The Problem (the physics), The Theory and Models (mathematical background and analytical solutions), and The Simulations (code developing plus validation, verification, and calibration). Classroom tested in graduate-level and short courses, Electromagnetic Modeling and Simulation: Clarifies concepts through numerous worked problems and quizzes provided throughout the book Features valuable MATLAB-based, user-friendly, effective engineering and research virtual design tools Includes sample scenarios and video clips recorded during characteristic simulations that visually impact learning—available on wiley.com Provides readers with their first steps in EM MODSIM as well as tools for medium and high-level code developers and users Electromagnetic Modeling and Simulation thoroughly covers the physics, mathematical background, analytical solutions, and code development of electromagnetic modeling, making it an ideal resource for electrical engineers and researchers.
Download or read book Advanced Modeling in Computational Electromagnetic Compatibility written by Dragan Poljak and published by John Wiley & Sons. This book was released on 2007-02-26 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text combines the fundamentals of electromagnetics with numerical modeling to tackle a broad range of current electromagnetic compatibility (EMC) problems, including problems with lightning, transmission lines, and grounding systems. It sets forth a solid foundation in the basics before advancing to specialized topics, and allows readers to develop their own EMC computational models for applications in both research and industry.
Download or read book Complex Electromagnetic Problems and Numerical Simulation Approaches written by Levent Sevgi and published by John Wiley & Sons. This book was released on 2003-06-10 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, engineering problems are very complex, requiring powerful computer simulations to power them. For engineers, observable-based parameterization as well as numerically computable formsâ??with rapid convergent properties if in a seriesâ??are essential. Complex Electromagnetic Problems and Numerical Simulation Approaches, along with its companion FTP site, will show you how to take on complex electromagnetic problems and solve them in an accurate and efficient manner. Organized into two distinct parts, this comprehensive resource first introduces you to the concepts, approaches, and numerical simulation techniques that will be used throughout the book and then, in Part II, offers step-by-step guidance as to their practical, real-world applications. Self-contained chapters will enable you to find specific solutions to numerous problems. Filled with in-depth insight and expert advice, Complex Electromagnetic Problems and Numerical Simulation Approaches: Describes ground wave propagation Examines antenna systems Deals with radar cross section (RCS) modeling Explores microstrip network design with FDTD and TLM techniques Discusses electromagnetic compatibility (EMC) and bio-electromagnetics (BEM) modeling Presents radar simulation Whether you're a professional electromagnetic engineer requiring a consolidated overview of the subject or an academic/student who wishes to use powerful simulators as a learning tool, Complex Electromagnetic Problems and Numerical Simulation Approaches - with its focus on model development, model justification, and range of validity - is the right book for you.
Download or read book Grid Computing for Electromagnetics written by Luciano Tarricone and published by Artech House. This book was released on 2004 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, more and more practitioners, researchers, and students are utilizing the power and efficiency of grid computing for their increasingly complex electromagnetics applications. This cutting-edge book offers practical and comprehensive guidance in using this new, low-cost approach to supercomputing to solve huge numerical electromagnetics problems. The book describes how to perform critical data exploration via the Web in a simple manner, build a computational grid for an electromagnetics application, and use collaborative engineering to share remote resources online. Moreover, this invaluable reference explains how to use grid computing to explore new electromagnetics applications that can lead to innovative market and research opportunities. CD-ROM Included! Contains all the software needed to build a grid and sample code for several application areas.
Download or read book Techniques for Numerically Efficient Analysis of Multi scale Problems in Computational Electromagnetics written by Kapil Sharma and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-scale problems in numerical electromagnetics are becoming increasingly common with the advent and widespread usage of compact mobile phones, body area networks, small and nano antennas, sensors, high-speed interconnects, integrated circuits and complex electronic packaging structures, to name just a few commercial applications. Numerical electromagnetic modeling and simulation of structures with multi-scale features is highly challenging due to the fact that electrically small as well as large features are simultaneously present in the model which demands for discretization of the computational domain such that the number of degrees of freedom is very large, thus, levying a heavy burden on computational resources. The multi-scale nature of a given problem also exacerbates the challenge of generating very fine meshes which do not introduce instabilities or ill-conditioned behaviors. In this work we introduce a hybrid technique, which combines frequency domain and time domain techniques in a manner such that the fine features (electrically small) of the object being modeled are handled by the Method of Moments (MoM) technique while the electrically large parts of the structure are dealt with by using the Finite-Difference Time-Domain (FDTD) technique in order to reduce the computational burden. Recently, structures with multi-scale features have been simulated by using the dipole moment (DM) approach combined with the FDTD technique to handle fine features in a multi-scale geometry. However, when the size of the scatterer becomes larger in terms of the wavelength and the quasi-static assumption becomes invalid, extensive modifications of the DM/FDTD hybrid approach are needed resulting in a high computational cost.The research proposes a novel hybrid FDTD technique, which combines the Method of Moments and the Finite-Difference Time-Domain techniques directly in the time domain circumventing the need to carry out frequency transform calculations as required in the DM approach when the object size is not small (size>/20). The proposed technique utilizes piecewise sinusoidal basis functions to represent the currents on arbitrarily shaped wires with fine features, and modified RWG basis function for surfaces. The fields scattered by the object with fine features in MoM region are computed in the time domain on a planar interface. The time domain fields obtained at the planar interface are then combined with the FDTD update equations. In contrast to the existing techniques used to handle this type of problems, the proposed technique is both efficient as well as stable.
Download or read book Computational Electromagnetic Methods for Multiphysics Simulations written by Xiaoyan Xiong and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Computational Electromagnetic Methods for Multiphysics Simulations" by Xiaoyan, Xiong, 熊晓燕, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: In this thesis, novel numerical algorithms rooted in computational electromagnetic methods are developed for multiphysics simulations. Due to multidisciplinary scientific advances, conventional electromagnetic methods face many new challenges that involve more physics beyond electromagnetics. It could start with extreme frequencies, periodicity, new materials or nonlinearities. When the frequency is low, the circuit physics dominates the field coupling results. Hence, a new electric field integral equation (EFIE) method is proposed to describe both circuit and wave physics at low frequency. It is formulated by using the Coulomb-gauge Green's function of quasi-static approximation. Integrated with loop-tree decomposition, frequency normalization and basis rearrangement techniques, the developed Coulomb-gauge EFIE approach shows the capability of solving low-frequency problems. By analyzing the properties of surface and Bloch modes inside finite periodic structures (FPSs), a novel method is proposed to calculate large FPSs efficiently and accurately. Thanks to the fast decay feature of surface waves, the performance of large FPSs is accurately predicted from the information of surface waves and Bloch waves inside small FPSs. The proposed method captures the edge effects meanwhile saves considerable computer resources. Furthermore, a general homogenization methodology is proposed to simplify the modeling and design of devices containing FPSs. To answer the nonlinear simulation request for nanoparticles, a surface integral equation (SIE) method is developed to model nonlinear optics problems. The second-harmonic radiation from metal nanoparticles with arbitrary shapes is evaluated. The mutual coupling between fundamental and second-harmonic fields is captured to take the depletion of fundamental field into account. With this method, a novel compact nonlinear Yagi-Uda antenna is designed to direct second-harmonic radiation. Simultaneously spectral and spatial isolations are achieved between scattered second-harmonic waves and incident fundamental waves. The developed SIE method is efficient with a surface discretization; and can employ experimentally tabulated linear susceptibility and nonlinear surface susceptibility tensor of metals directly. Finally, to handle the measured data for radio frequency and microwave nonlinear devices, a systematic and general-purpose method is proposed to generate blackbox macro-models of nonlinear circuits based on the Volterra series representation of X-parameters. The generated macro-models include memory effects automatically and can support transient simulation with arbitrary input. It constitutes a powerful supplement to existing blackbox macro-modeling methods for nonlinear circuits. The above proposed methods are demonstrated by various examples. The accuracy, efficiency, and robustness of these methods are clearly observed. Subjects: Electromagnetism - Data processing
Download or read book The Electromagnetic Wave Simulator written by Wolfgang J. R. Hoefer and published by Wiley. This book was released on 1991-08-15 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excellent coverage of the two-dimensional transmission line matrix (TLM) method of electromagnetic field modeling and TLM electromagnetic wave simulation software for MS-DOS computers is detailed. Divided into 3 sections, it begins with a comprehensive treatment of the two-dimensional TLM method, including all concepts and procedures incoporated in the field-modeling part of the software. An expansive user's manual and tutorial, which describes various features of the simulator using numerous examples, comprises the middle section. Concludes with a unique selection of experiments for a typical course in microwaves and electromagnetics.
Download or read book Computational Methods in Electromagnetic Compatibility written by Dragan Poljak and published by Wiley. This book was released on 2018-04-24 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers a comprehensive overview of the recent advances in the area of computational electromagnetics Computational Method in Electromagnetic Compatibility offers a review of the most recent advances in computational electromagnetics. The authors—noted experts in the field—examine similar problems by taking different approaches related to antenna theory models and transmission line methods. They discuss various solution methods related to boundary integral equation techniques and finite difference techniques. The topics covered are related to realistic antenna systems including antennas for air traffic control or ground penetrating radar antennas; grounding systems (such as grounding systems for wind turbines); biomedical applications of electromagnetic fields (such as transcranial magnetic stimulation); and much more. The text features a number of illustrative computational examples and a reference list at the end of each chapter. The book is grounded in a rigorous theoretical approach and offers mathematical details of the formulations and solution methods. This important text: Provides a trade-off between a highly efficient transmission line approach and antenna theory models providing analysis of high frequency and transient phenomena Contains the newest information on EMC analysis and design principles Discusses electromagnetic field coupling to thin wire configurations and modeling in bioelectromagnetics Written for engineering students, senior researchers and practicing electrical engineers, Computational Method in Electromagnetic Compatibility provides a valuable resource in the design of equipment working in a common electromagnetic environment.
Download or read book The Method of Moments in Electromagnetics written by Walton C. Gibson and published by CRC Press. This book was released on 2021-09-06 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Method of Moments in Electromagnetics, Third Edition details the numerical solution of electromagnetic integral equations via the Method of Moments (MoM). Previous editions focused on the solution of radiation and scattering problems involving conducting, dielectric, and composite objects. This new edition adds a significant amount of material on new, state-of-the art compressive techniques. Included are new chapters on the Adaptive Cross Approximation (ACA) and Multi-Level Adaptive Cross Approximation (MLACA), advanced algorithms that permit a direct solution of the MoM linear system via LU decomposition in compressed form. Significant attention is paid to parallel software implementation of these methods on traditional central processing units (CPUs) as well as new, high performance graphics processing units (GPUs). Existing material on the Fast Multipole Method (FMM) and Multi-Level Fast Multipole Algorithm (MLFMA) is also updated, blending in elements of the ACA algorithm to further reduce their memory demands. The Method of Moments in Electromagnetics is intended for students, researchers, and industry experts working in the area of computational electromagnetics (CEM) and the MoM. Providing a bridge between theory and software implementation, the book incorporates significant background material, while presenting practical, nuts-and-bolts implementation details. It first derives a generalized set of surface integral equations used to treat electromagnetic radiation and scattering problems, for objects comprising conducting and dielectric regions. Subsequent chapters apply these integral equations for progressively more difficult problems such as thin wires, bodies of revolution, and two- and three-dimensional bodies. Radiation and scattering problems of many different types are considered, with numerical results compared against analytical theory as well as measurements.
Download or read book Multi scale Modeling written by Fadi Khalil and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The numerical electromagnetic tools for complex structures simulation, i.e. multi-scale, are often limited by available computation resources. Nowadays, Grid computing has emerged as an important new field, based on shared distributed computing resources of Universities and laboratories. Using these shared resources, this study is focusing on grid computing potential for electromagnetic simulation of multi-scale structure. Since the numerical simulations tools codes are not initially written for distributed environment, the first step consists to adapt and deploy them in Grid computing environment. A performance study is then realized in order to evaluate the efficiency of execution on the test-bed infrastructure. New approaches for distributing the electromagnetic computations on the grid are presented and validated. These approaches allow a very remarkable simulation time reduction for multi-scale structures and friendly-user interfaces.
Download or read book A Hybrid Method for Electromagnetic Modeling of Large Scale Structures written by Quang M. Nguyen and published by . This book was released on 2016 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is focused on developing a new hybrid method in computational electromagnetics to solve complex problems accurately in a timely fashion. The concept is based on dividing the original computational domain into smaller sub-domains. Each sub-domain is first solved independently, then the interactions between the sub-domains are accounted for through an iterative procedure. The main difference of the proposed hybrid scheme in this study in comparison with the current hybrid methods in the literature is that the proposed method allows users to have the freedom to choose from a number of available methods that suit the problem best. Current hybrid methods rely on a predetermined combination of numerical techniques. This flexibility in the choice of methods employed in the hybrid approach is achieved by creating an interface capable of interacting between the different methods properly. Furthermore, the proposed method renders to parallel implementation as each sub-domain is solved independently. The proposed hybrid scheme in its current state can be applied to three different scenarios: (i) multiple non-touching homogeneous objects, (ii) inhomogeneous objects, and (iii) multiple touching PEC objects. Numerical examples of various combinations of the methods are presented to validate the accuracy and the robustness of the proposed.
Download or read book High Performance Computing Systems and Applications written by Nikitas J. Dimopoulos and published by Springer Science & Business Media. This book was released on 2002 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: High Performance Computing Systems and Applications contains a selection of fully refereed papers presented at the 14th International Conference on High Performance Computing Systems and Applications held in Victoria, Canada, in June 2000. This book presents the latest research in HPC Systems and Applications, including distributed systems and architecture, numerical methods and simulation, network algorithms and protocols, computer architecture, distributed memory, and parallel algorithms. It also covers such topics as applications in astrophysics and space physics, cluster computing, numerical simulations for fluid dynamics, electromagnetics and crystal growth, networks and the Grid, and biology and Monte Carlo techniques. High Performance Computing Systems and Applications is suitable as a secondary text for graduate level courses, and as a reference for researchers and practitioners in industry.
Download or read book Introduction to Reversible Computing written by Kalyan S. Perumalla and published by CRC Press. This book was released on 2013-09-10 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few books comprehensively cover the software and programming aspects of reversible computing. Filling this gap, Introduction to Reversible Computing offers an expanded view of the field that includes the traditional energy-motivated hardware viewpoint as well as the emerging application-motivated software approach. Collecting scattered knowledge into one coherent account, the book provides a compendium of both classical and recently developed results on reversible computing. It explores up-and-coming theories, techniques, and tools for the application of reversible computing—the logical next step in the evolution of computing systems. The book covers theory, hardware and software aspects, fundamental limits, complexity analyses, practical algorithms, compilers, efficiency improvement techniques, and application areas. The topics span several areas of computer science, including high-performance computing, parallel/distributed systems, computational theory, compilers, power-aware computing, and supercomputing. The book presents sufficient material for newcomers to easily get started. It provides citations to original articles on seminal results so that readers can consult the corresponding publications in the literature. Pointers to additional resources are included for more advanced topics. For those already familiar with a certain topic within reversible computing, the book can serve as a one-stop reference to other topics in the field.
Download or read book Power Systems Electromagnetic Transients Simulation written by Neville Watson and published by IET. This book was released on 2003 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic transients simulation (EMTS) has become a universal tool for the analysis of power system electromagnetic transients in the range of nanoseconds to seconds. This book provides a thorough review of EMTS and many simple examples are included to clarify difficult concepts. This book will be of particular value to advanced engineering students and practising power systems engineers.
