Zobrazeno 1 - 10
of 3 875
pro vyhledávání: '"A, Andriulli"'
We propose here a novel stabilization strategy for the PMCHWT equation that cures its frequency and conductivity related instabilities and is obtained by leveraging quasi-Helmholtz projectors. The resulting formulation is well-conditioned in the enti
Externí odkaz:
http://arxiv.org/abs/2408.01321
In this contribution we analyze the spectral properties of some commonly used boundary integral operators in computational electromagnetics and of their discrete counterparts, highlighting peculiar features of their spectra. In particular, a comparis
Externí odkaz:
http://arxiv.org/abs/2407.09116
Surface integral equations (SIEs)-based boundary element methods are widely used for analyzing electromagnetic scattering scenarii. However, after discretization of SIEs, the spectrum and eigenvectors of the boundary element matrices are not usually
Externí odkaz:
http://arxiv.org/abs/2405.11167
This paper introduces a time-domain combined field integral equation for electromagnetic scattering by a perfect electric conductor. The new equation is obtained by leveraging the quasi-Helmholtz projectors, which separate both the unknown and the so
Externí odkaz:
http://arxiv.org/abs/2312.06367
Autor:
Giunzioni, Viviana, Ciacco, Giuseppe, Henry, Clément, Merlini, Adrien, Andriulli, Francesco P.
This work presents a fast direct solver strategy allowing full-wave modeling and dosimetry at terahertz (THz) frequencies. The novel scheme leverages a preconditioned combined field integral equation together with a regularizer for its elliptic spect
Externí odkaz:
http://arxiv.org/abs/2310.15644
A fully kinetic 2D axisymmetric Particle-in-Cell (PIC) model is used to examine the effects of background facility pressure on the plasma transport and propulsive efficiency of magnetic nozzles. Simulations are performed for a low-power (150 W class)
Externí odkaz:
http://arxiv.org/abs/2310.16264
The accuracy of the electric field integral equation (EFIE) can be substantially improved using high-order discretizations. However, this equation suffers from ill-conditioning and deleterious numerical effects in the low-frequency regime, often jeop
Externí odkaz:
http://arxiv.org/abs/2308.15331
Autor:
Masciocchi, Matteo E., Citraro, Ermanno, Dély, Alexandre, Rahmouni, Lyes, Merlini, Adrien, Andriulli, Francesco P.
Recent contributions showed the benefits of operator filtering for both preconditioning and fast solution strategies. While previous contributions leveraged laplacian-based filters, in this work we introduce and study a different approach leveraging
Externí odkaz:
http://arxiv.org/abs/2307.09276
Autor:
Merlini, Adrien, Henry, Clément, Consoli, Davide, Rahmouni, Lyes, Dély, Alexandre, Andriulli, Francesco P.
Quasi-Helmholtz decompositions are fundamental tools in integral equation modeling of electromagnetic problems because of their ability of rescaling solenoidal and non-solenoidal components of solutions, operator matrices, and radiated fields. These
Externí odkaz:
http://arxiv.org/abs/2211.07704
Autor:
Giunzioni, Viviana, G., John E. Ortiz, Merlini, Adrien, Adrian, Simon B., Andriulli, Francesco P.
We present a Calder\'on preconditioning scheme for the symmetric formulation of the forward electroencephalographic (EEG) problem that cures both the dense discretization and the high-contrast breakdown. Unlike existing Calder\'on schemes presented f
Externí odkaz:
http://arxiv.org/abs/2211.01967