Computational electromagnetics

About: Computational electromagnetics is a research topic. Over the lifetime, 6412 publications have been published within this topic receiving 113727 citations. The topic is also known as: Electromagnetic field analysis.

The generalized multipole technique for computational electromagnetics

Abstract: Geometry, differential and integral forms Coulomb-Ampere theory of electricity and magnetism Maxwell's electrodynamics post-Maxwellian electrodynamics numerical field computations well-known numerical methods Generalized Multipole Technique (GMT) Multiple Multipole Programs (MMP) personal computers and transputers.

Computer analysis of transient voltages in large grounding systems

Abstract: A computer model for transient analysis of a network of buried and above ground conductors is presented The model is based on the electromagnetic field theory approach and the modified image theory Validation of the model is achieved by comparison with field measurements The model is applied for computation of transient voltages to remote ground of large grounding grid conductors Also computation of longitudinal and leakage currents, transient impedance, electromagnetic fields, and transient induced voltages is possible This model is aimed to help in EMC and lightning protection studies that involve electrical and electronic systems connected to grounding systems

Analysis of Large Complex Structures With the Synthetic-Functions Approach

Abstract: An innovative procedure is presented that allows the method of moments (MoM) analysis of large and complex antenna and scattering problems at a reduced memory and CPU cost, bounded within the resources provided by a standard (32 bit) personal computer. The method is based on the separation of the overall geometry into smaller portions, called blocks, and on the degrees of freedom of the field. The blocks need not be electrically unconnected. On each block, basis functions are generated with support on the entire block, that are subsequently used as basis functions for the analysis of the complete structure. Only a small number of these functions is required to obtain an accurate solution; therefore, the overall number of unknowns is drastically reduced with consequent impact on storage and solution time. These entire-domain basis functions are called synthetic functions; they are generated from the solution of the electromagnetic problem for the block in isolation, under excitation by suitably defined sources. The synthetic functions are obtained from the responses to all sources via a procedure based on the singular-value decomposition. Because of the strong reduction of the global number of unknowns, one can store the MoM matrix and afford a direct solution. The method is kernel-free, and can be implemented on existing MoM codes.

Shadow-corrected electromagnetic scattering from a randomly rough surface

Abstract: The problem of electromagnetic scattering from a randomly rough surface is analyzed in the high-frequency limit with the use of the Kirchhoff approximation in conjunction with the vector Kirchhoff equation. The surface is allowed to have a finite conductivity but is assumed to be homogeneous. The analysis does not require that the surface be described as a Gaussian process; however, explicit formulas are presented for this case. A major new consideration is the effect of shadowing by the surface on its ability to scatter energy.

Microwave Sintering: Fundamentals and Modeling

Abstract: This paper reviews the basic physical notions underlying microwave sintering and the theoretical and numerical models of the microwave sintering process. The propagation and absorption of electromagnetic waves in materials, and the distribution of electromagnetic field in cavity resonators that serve as applicators for microwave processing are discussed and the electromagnetic modeling of such applicators is reviewed. The microwave absorption properties of ceramic and metal powder materials and the methods of their description are addressed. Self-consistent electromagnetic and thermal models that are capable of predicting the temperature distribution in the microwave-heated materials and dynamic effects such as thermal runaway instabilities are reviewed. The multiphysics simulations that combine electromagnetic, thermal, and sintering models and result in predicting densification, shrinkage, and grain structure evolution are discussed in detail. The significance of microwave nonthermal effects in sintering is demonstrated based on the experimental results, and the models of such effects are reviewed.