论文标题
关于通过Helmholtz运算符和准螺旋托投影仪的高频制度中的电磁积分方程
On Preconditioning Electromagnetic Integral Equations in the High Frequency Regime via Helmholtz Operators and quasi-Helmholtz Projectors
论文作者
论文摘要
通过\ ac {bem}快速准确解决电磁问题通常会通过在三个不同的方向上发生的调理问题来挑战:(i)当频率降低并且离散密度的密度降低并且离散频率保持恒定时,当离散频率增加而(iii)时,当频率保持恒定时,并且(iii)随着离散化密度的增加而保持频率。尽管已经提出了基于Helmholtz的分解和类似Calderón的技术的政权(i)和(ii)中出现的问题令人满意的补救措施,但最后一个政权仍然具有挑战性。实际上,最后一次政权都受到虚假共鸣和不良条件的困扰,前者可以通过合并的现场策略来解决,这不是这项工作的话题。在这项贡献中,在上述所有方案中保持良好的条件,并且不需要对密集的电磁电位运算符的barycentric离散化,并呈现了晶谐谐波分析,这些新型对称标量和矢量电动类型制剂均保持良好的条件。
Fast and accurate resolution of electromagnetic problems via the \ac{BEM} is oftentimes challenged by conditioning issues occurring in three distinct regimes: (i) when the frequency decreases and the discretization density remains constant, (ii) when the frequency is kept constant while the discretization is refined and (iii) when the frequency increases along with the discretization density. While satisfactory remedies to the problems arising in regimes (i) and (ii), respectively based on Helmholtz decompositions and Calderón-like techniques have been presented, the last regime is still challenging. In fact, this last regime is plagued by both spurious resonances and ill-conditioning, the former can be tackled via combined field strategies and is not the topic of this work. In this contribution new symmetric scalar and vectorial electric type formulations that remain well-conditioned in all of the aforementioned regimes and that do not require barycentric discretization of the dense electromagnetic potential operators are presented along with a spherical harmonics analysis illustrating their key properties.