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.

Electromagnetic Scattering by Parallel Metamaterial Cylinders

Abstract: Electromagnetic Scattering problem by multiple metamaterial cylinders are studied. A formulation for coating conducting cylinders by metamaterial is presented. The formulation is based on the expansion of electromagnetic fields by Bessel functions in local cylindrical coordinates and then transformation from local coordinates to others using addition theorem of Hankel function. Near fields and scattering cross sections for metamaterial and dielectric cylinders are studied and compared to each other. We have shown that an array of metamaterial cylinders increases forward scattering cross section which may use to increase the directivity of antennas.

In-mold electromagnetic stirring in continuous casting

Abstract: To get the optimal operation of in-mold electromagnetic stirring through the fundamental characteristics, a three-dimensional magnetohydrodynamic calculation model was used, taking into consideration heat transfer and solidification as well as free surface. Comparison between measured velocity and calculated velocity is in agreement. A shadow method that calculates electromagnetic force in consideration of free surface transition is proposed to reduce computing time and maintain sufficient accuracy. A calculated free surface of mercury under a 200-Hz magnetic field shows an adequate agreement with the experimental one. Calculation results applied to the continuous casting process taking into consideration heat transfer and solidification are in good agreement with operation data. This model shows that electromagnetic stirring makes the solidified shell uniform and dynamic deviation of temperature stable.

Computational Electromagnetics and Model-Based Inversion: A Modern Paradigm for Eddy-Current Nondestructive Evaluation

Abstract: ─ This is the first of a planned series of papers in which we demonstrate the application of computational electromagnetics, especially the volume-integral method, to problems in eddycurrent nondestructive evaluation (NDE). In particular, we will apply the volume-integral code, VIC-3D, to solve forward and inverse problems in NDE. The range of problems that will be considered spans industries from nuclear power to aerospace to materials characterization. In this paper we will introduce the notion of model-based inversion, emphasizing the role of `estimationtheoretic metrics' to the practical application of inverse theory. Index Terms ─ volume-integral equations, electromagnetic nondestructive evaluation, modelbased inversion, model-based standards, estimation-theoretic metrics.

The finite-element modeling of three-dimensional time-domain electromagnetic fields in strongly inhomogeneous media

Abstract: An efficient and accurate finite-element method is presented for computing transient electromagnetic fields in three-dimensional configurations containing arbitrarily inhomogeneous media that may be anisotropic. To obtain accurate results with an optimum computational efficiency, both edge and Cartesian elements are used for approximating the spatial distribution of the field. The efficiency and the storage requirements of the method are further optimized by choosing an irreducible implicit formulation, by solving the resulting system of algebraic equations in terms of the time-dependent expansion coefficients iteratively, and by using an incomplete LU-decomposition for preconditioning. A method is described for imposing the divergence condition in a weighted sense. The theory discussed was implemented in the FEMAXT code. >