By Ozgur Ergul, Levent Gurel
The Multilevel speedy Multipole set of rules (MLFMA) for fixing Large-Scale Computational Electromagnetic difficulties offers an in depth and tutorial assessment of imposing MLFMA. The book:
- Presents a accomplished therapy of the MLFMA set of rules, together with easy linear algebra suggestions, contemporary advancements at the parallel computation, and a couple of software examples
- Covers recommendations of electromagnetic difficulties concerning dielectric items and perfectly-conducting objects
- Discusses purposes together with scattering from airborne ambitions, scattering from crimson blood cells, radiation from antennas and arrays, metamaterials etc.
- Is written through authors who have greater than 25 years event at the improvement and implementation of MLFMA
The booklet should be important for post-graduate scholars, researchers, and lecturers, learning within the components of computational electromagnetics, numerical research, and laptop technology, and who wish to enforce and strengthen rigorous simulation environments according to MLFMA.
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Extra info for The Multilevel Fast Multipole Algorithm
In the literature, there are two common approaches to solve low-frequency problems efficiently via (modified versions of) MLFMA. The first approach is based on a spectral representation of the Green’s function, where radiated fields are divided into propagating and evanescent parts –. Evanescent waves are employed to compute the interactions between small boxes separated by short distances. The second approach is based on the multipole representation of radiated fields –. 7, the Green’s function is factorized in a series of multipoles, but the multipoles are not converted into plane waves.
21, where a box is divided into eight identical boxes and one of those smaller boxes is further divided into eight boxes, etc. Practically, only nonempty boxes are considered and divided into subboxes, whereas empty boxes created at any stage are simply omitted. The recursion depth depends on the problem as well as the desired accuracy; but in general, the size of the smallest boxes at the lowest level is in the order of the wavelength. 22, nonempty boxes and the recursive relationship between them are used to construct a multilevel tree structure.
Since the singularity is logarithmic and it is mild, it does not cause a serious problem in the numerical integration over the testing triangle, as long as the integration (observation) points are taken inside the testing triangle. It is also possible to apply a singularity-extraction technique for the outer integrals in near-neighboring interactions . 14 A limit case as the observation point approaches the edge of the basis triangle in a near-neighboring interaction. 123) R−1 + s−1 over the testing triangle, where f (x, y, z) is a linear function.