Iso-Geometric Integral Equation Solvers and Their Compression via Manifold Harmonics

The state of the art of electromagnetic integral equations has seen significant growth over the past few decades, overcoming some of the fundamental bottlenecks: computational complexity, low-frequency breakdown, dense-discretization breakdown, preconditioning, and so on. Likewise, the community has...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2022-08, Vol.70 (8), p.6893-6904
Main Authors: Alsnayyan, A. M. A., Shanker, B.
Format: Article
Language:English
Subjects:
Breakdown
Computational electromagnetics
Electric breakdown
Fast multipole method
Harmonic analysis
Harmonics
higher order
Infrastructure
Integral equations
iso-geometric methods
manifold harmonics
Manifolds
Manifolds (mathematics)
Preconditioning
Splines (mathematics)
subdivision surfaces
Surface impedance
Surface reconstruction
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Summary:The state of the art of electromagnetic integral equations has seen significant growth over the past few decades, overcoming some of the fundamental bottlenecks: computational complexity, low-frequency breakdown, dense-discretization breakdown, preconditioning, and so on. Likewise, the community has seen extensive investment in the development of methods for higher order analysis, in both geometry and physics. Unfortunately, these standard geometric descriptors are continuous, but their normals are discontinuous at the boundary between triangular tessellations of control nodes, or patches, with a few exceptions; as a result, one needs to define additional mathematical infrastructure to define physical basis sets for vector problems. In stark contrast, the geometric representation used for design is second order differentiable almost everywhere on the surfaces. Using these descriptions for analysis opens the door to several possibilities, and is the area we explore in this article. Our focus is on loop subdivision-based isogeometric methods. In this article, our goals are twofold: 1) development of computational infrastructure for isogeometric analysis of electrically large simply connected objects, and 2) introduction of the notion of manifold harmonic transforms and its utility in computational electromagnetics. Several results highlighting the efficacy of these two methods are presented.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2022.3164932