Accuracy of MOM calculations for scattering from simple objects

Summarizes a study of applications of massively parallel high performance computing to analysis of electromagnetic scattering from a number of targets. Specifically, the paper focuses on the use of advanced numerical techniques and massively parallel computing in implementation of the method of moments (MOM) to numerical solution of integral equation electromagnetic scattering formulations. The goal of the paper is to increase numerical accuracy without sacrificing computational efficiency. The main thrust is to explore several strategies for improving the accuracy of method of moments (MOM) calculations of electromagnetic scattering from metallic, dielectric, and resistive bodies. These strategies, involving more intensive computation than less accurate conventional techniques, are ideally suited for implementation on a massively parallel high-performance computer. The paper emphasizes strategies to minimize computation time and storage requirements. Some of these strategies include adaptive partitioning of the scattering body; non-uniform partitioning of the body; and the usage of alternative basis functions, including basis functions incorporating correct singular behavior near edges. The residual and the singular value decomposition (SVD) are used to diagnose solution convergence and accuracy. Specific cases presented include application of the strategies outlined to the cases of scattering from 2-dimensional metallic and dielectric scatterers.