IEEE Journal on Multiscale and Multiphysics Computational Techniques最新文献

{"title":"Application of the Born Approximation for Modeling EM Effects of Moving Materials in COMSOL Multiphysics","authors":"Kirill Zeyde;Mirco Raffetto","doi":"10.1109/JMMCT.2026.3663392","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3663392","url":null,"abstract":"In this paper, we present the application of Born approximations for solving problems related to the influence of moving materials on the scattered electromagnetic field within a commercial CAD environment. The study focuses on non-relativistic velocities, which are of significant practical relevance. The integration of the methodology into COMSOL was straightforward and gave significant results. We provide the general formulation of the problem of interest, discuss the relevant electrodynamic conditions, and introduce the Born approximation under these assumptions. A detailed description of the developed procedure workflow is given. The approach is verified through a comparison between simulation results and semi-analytical solutions. The key aspect of this work is that the integration of Born approximations into commercial software offers a powerful and efficient tool for solving electrodynamics problems involving media in motion, especially those with strong practical significance. This is supported by an example of application of the methodology to a case of practical relevance.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"125-134"},"PeriodicalIF":1.5,"publicationDate":"2026-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical Characterization of Electromagnetic Fields Scattered by Poisson Point Process Distributed PEC Cylinders","authors":"Srikumar Sandeep;Gabriele Gradoni","doi":"10.1109/JMMCT.2026.3655145","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3655145","url":null,"abstract":"This paper presents an efficient semi-analytical method for computing the electromagnetic field scattered by multiple infinitely long, perfectly electrically conducting (PEC) cylinders distributed at arbitrary locations and excited by either a plane wave or electric line sources. The proposed approach leverages the cylindrical wave expansion of electromagnetic fields combined with the translation-addition theorem of the Bessel and Hankel functions to rigorously account for multiple scattering interactions. The method exhibits high numerical stability and computational efficiency, making it suitable for large-scale configurations and Monte-Carlo simulations. The proposed method is validated against full-wave simulations, demonstrating excellent agreement and significant computational advantages.We utilize the developed method to investigate in detail the statistics of the field scattered by random collection of cylinders, whose positions are distributed as per a Poisson point process. The scattered electric field's real and imaginary parts follow a jointly Gaussian distribution. The variation of the statistical parameters as a function of cylinder radius and incident wave direction is examined. Finally, we apply the formulation to a 3GPP channel communication problem.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"78-91"},"PeriodicalIF":1.5,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"All-Metallic Orbital Angular Momentum Beam Generator for Future High-Power Microwave Applications","authors":"Yuvraj B. Dhanade;Amalendu Patnaik","doi":"10.1109/JMMCT.2026.3655953","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3655953","url":null,"abstract":"In addition to enhancing spectral efficiency in wireless communication systems, electromagnetic waves carrying Orbital Angular Momentum (OAM) offer several advantages in high-power microwave applications. Consequently, numerous state-of-the-art OAM generators have been reported, the majority of which are based on dielectric structures. However, in high-power scenarios, such dielectric-based generators are inherently constrained by their limited power-handling capability. To overcome this limitation, this paper presents a simple and effective technique for generating OAM beams using an all-metallic structure suitable for high-power microwave applications. The proposed design is validated through both simulations and experimental characterization of its OAM properties. The contrasting features distinguishing the proposed structure from the existing OAM generators are its high mode purity, simple feeding scheme, and large power handling capability.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"92-99"},"PeriodicalIF":1.5,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An ADI–SBTD Technique Free of CFL Stability Condition for Transient Analysis of Coaxial–TGVs in 3D Integration","authors":"K. Madhu Kiran;Rohit Dhiman","doi":"10.1109/JMMCT.2026.3652725","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3652725","url":null,"abstract":"This paper presents an alternating direction implicit – sampling-biorthogonal time-domain (ADI–SBTD) based formulation, free of the Courant-Friedrichs-Lewy stability condition, for accurate and efficient characterization of the transient analysis of coaxial through-glass vias (C-TGVs). Unlike traditional finite-difference time-domain (FDTD) algorithm, multi-resolution time-domain (MRTD), and sampling biorthogonal time-domain (SBTD) methods, the ADI–SBTD technique retains unconditional stability, thus enabling reliable transient simulations at significantly larger time steps. This leads to a substantial reduction in computational effort without compromising accuracy. The method is exhaustively validated against both the SPICE simulations and the SBTD approach, demonstrating excellent agreement with an average error of less than 1% in the several key performance parameters for examining the transient crosstalk effects in C-TGVs. Comparative studies demonstrate that the ADI-SBTD computational framework achieves accuracy at par with both the SBTD and SPICE-based results, thus confirming its reliability and effectiveness for high-fidelity signal analysis in three-dimensional (3D) integrated systems. Moreover, this approach exhibits superior computational efficiency than the SBTD, thus making it a practical solution for addressing the issues of electromagnetic interference and electromagnetic compatibility in 3D integration.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"100-112"},"PeriodicalIF":1.5,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling of Microwave Propagation Properties of Generalized Anisotropic Composite","authors":"Changyou Li;Feiwu He;Jingyi Hao","doi":"10.1109/JMMCT.2026.3652145","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3652145","url":null,"abstract":"A highly accurate and computationally efficient large-scale model is proposed here for generalized anisotropic composite. Two dimensional obliquely incident plane wave is considered. Materials in all layers can be lossy or lossless generalized anisotropic. Maxwell's equations are first reformulated to yield a matrix form depending on four unknown transverse field components being tangential to the layer interface. A PQ decomposition of the coefficient matrix produces four eigenvalues which represent the transverse dependence of forward and backward propagating waves along the normal direction of the layer interface. Layer S-matrices are then derived for describing wave propagation from one layer to another. The full S-matrix for the whole composite is produced via cascading the layer S-matrices from the top layer to the bottom one. It relates the incident wave to the transmitted and reflected waves. Reflection and transmission coefficients of co- and cross-polarized waves are then obtained. Perfect electric conductor boundary condition is integrated into the multi-layer composite via modification of layer S-matrix for the first time. Fields in the composite are constructed via layer S-matrices.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"68-77"},"PeriodicalIF":1.5,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146082142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Multilevel Fast High Frequency Scattering Method From Electrically Large Multi-Layer Coated Scatterers","authors":"Han Kun Ma;Yu Mao Wu","doi":"10.1109/JMMCT.2026.3673131","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3673131","url":null,"abstract":"A multilevel fast high frequency (MLFHF) scattering method from multi-layer coated scatterers is presented. The wideband and wide angle radar cross section (RCS) analysis of thin multi-layer coated scatterers requires dense sampling in frequency angle space, making accurate and efficient modeling of coating-induced multiple reflections challenging in practice. These coating effects are modeled by a branchwise generalized equivalent reflection (GER) embedded in a surface current formulation in this work. Multilevel schemes then reduce the computational cost by interpolating scattered fields from sparse samples, but their accuracy is limited by phase-reference misalignment. On wavelength-scale quadratic patches, the region-center reference can deviate from branch-dependent stationary-phase centers, causing interpolation errors and oversampling. To address this, a physics-guided equivalent phase compensation (EPC) scheme is developed that selects branchwise equivalent phase centers from relevant critical points and forms a coherent phase reference. Numerical examples demonstrate accurate wideband and wide angle RCS prediction for five-layer coated scatterers with electrical sizes up to 1,167<inline-formula><tex-math>$lambda$</tex-math></inline-formula>. At comparable accuracy, the MLFHF–EPC framework achieves a speedup factor of 6.79 over conventional multilevel methods.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"135-145"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147665513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of the Near Field by the Fast Physical Optics Method With the Adaptive Mesh Technique","authors":"Si Jia Guo;Yu Mao Wu;Li-Xin Guo","doi":"10.1109/JMMCT.2026.3674669","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3674669","url":null,"abstract":"In this work, physical optics (PO) scattered near fields of electrically large target under different excitation sources are calculated by the linear amplitude-based fast physical optics method combined with the adaptive mesh technique (ALFPO). A key innovation is the derivation of phase gradient-based adaptive sampling interval formulas for quadratic patches, applicable to calculation of scattered near and far fields, which addresses the over-sampling issue in PO method. Also, adaptive mesh distribution generated via the phase gradient and local error of scattered field is analyzed in view of high-frequency wave physics. Moreover, the edge grid segmentation (EGS) approach is proposed to smoothen shadowed boundaries, ensuring the more accurate lit region data for calculation. Numerical results demonstrate that both the phase gradient-based ALFPO (PG-ALFPO) and scattered field error-based ALFPO (FE-ALFPO) outperform the linear amplitude-based fast physical optics (LFPO) method and FEKO software. They reduce the number of patches by one or two orders of magnitude while maintaining accuracy. Notably, the PG-ALFPO directly reflects high-frequency physical mechanisms. Both ALFPO methods achieve memory savings at the cost of CPU time, with PG-ALFPO exhibiting nearly twice the efficiency of FE-ALFPO. In short, the ALFPO methods along with EGS approach provide a significant way to solve near-field scattering features of electrically large target.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"146-155"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147665505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low Complexity Full-Wave Stochastic Analysis for Spatial Dielectric Variations","authors":"Abhijith B. Narendranath;Kiran Ravindran;Kalarickaparambil Joseph Vinoy","doi":"10.1109/JMMCT.2026.3681845","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3681845","url":null,"abstract":"Design of RF to millimeterwave components can be improved by incorporating stochastic variations. Spectral stochastic finite element method (SSFEM) with Karhunen-Loeve expansion (KLE) has been implemented exploiting the correlations in the spatial stochasticity of permittivity, but resulted in an exponential increase in stochastic dimensionality. To reduce the number of random variables in the stochastic model while accurately retaining features of KLE in high dimensional problems, a spatial averaging scheme of correlated stochastic material properties is proposed. Nyström and Galerkin methods are employed to evaluate KLE to apply this for arbitrary geometries and covariance functions representing spatial variations. Stochastic variations in the real and imaginary parts of permittivity in multiple sub-domains are analyzed. The results are validated with numerical experiments to demonstrate its accuracy and speed.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"179-183"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Chrono::Electronics: An Open-Source Simulation Library for Electro-Mechanical Problems","authors":"Federico Maria Reato;Matteo Santelia;Bret Witt;Jamiul Haque;Patrick Chen;Filippo Morlacchi;Claudio Ricci;Matteo Calzaferri;Maurizio Zama;Antonio Milici;Simone Cinquemani;Dan Negrut","doi":"10.1109/JMMCT.2026.3683328","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3683328","url":null,"abstract":"The growing relevance of mechatronic applications, characterized by the tight interaction between mechanical and electrical domains, is driving the demand for accurate and efficient simulation tools. These simulations are particularly useful in robotics and automation, where mechanical sub-assemblies are coupled with various electric and electromagnetic devices, e.g. actuators or sensors. To support this class of applications, we present <monospace>Chrono::Electronics</monospace> - an open-source co-simulation solution for electro-mechanical systems. The library is designed to couple the multibody dynamics open-source engine Project Chrono, with the versatile open-source circuit simulator NGSpice, to solve complex electro-mechanical dynamic interactions. In this contribution we present the main features of the co-simulation library for electro-mechanical systems, featuring a fully reorganized structure and a renovated object-oriented architecture. The new framework introduces dedicated mechanisms for model and data handling, which improve the computational efficiency. In addition, the modular design of the utility enhances simulations results reliability and broadens the spectrum of possible applications through the introduction of subclasses for handling pre-defined, user-defined, and manufacturer-defined circuits. Beyond validating the proposed environment, we propose a novel methodology previously unexplored in this field, for the characterization of brushed DC motor parameters, based on a Bayesian Monte Carlo approach. Unlike existing techniques reported in the literature, this strategy provides a fundamentally different perspective on parameter estimation for real case applications. The method has been applied to an industrial DC motor, yielding highly accurate results and further demonstrating the framework’s scalability and potential across electro-mechanical power applications where reliable modelling of electro-mechanical interactions is crucial.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"184-196"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NSI-IBP: A General Numerical Singular Integral Method via Integration by Parts","authors":"Shaolin Liao","doi":"10.1109/JMMCT.2026.3677619","DOIUrl":"https://doi.org/10.1109/JMMCT.2026.3677619","url":null,"abstract":"A general framework of Numerical Singular Integrals (NSI) method based on the Integration By Parts (IBP) has been developed for integrals involving singular and nearly singular integrands, or NSI-IBP. Through a general integration by parts formula and by choosing some analytically integrable function to approximate the original integrand, various well-known integration by parts methods can be derived. Rigorous mathematical derivations have been performed to transform the original singular or nearly singular integrals into non-singular integrals that can be computed efficiently, along with the boundary values added. What’s more important, the NSI-IBP method works well even when the exact form of the singular integrand is not known. Criteria on how to choose the appropriate function with a known analytical integral that closely approximates the original integrand have been outlined and explained. Numerical recipe has been presented to apply the proposed NSI-IBP. Numerical experiments have been carried out on various singular integrals such as the power-law decaying integrand, the logarithmic function, and their hybrid products. It can be shown that various relative accuracy up to <inline-formula><tex-math>$10^{-15}$</tex-math></inline-formula> can be achieved, even the exact singular function is not known. Finally, the nearly singular integrals involving the scalar Green’s function have been evaluated for both electrostatics applications and Computational Electromagnetics (CEM) applications.","PeriodicalId":52176,"journal":{"name":"IEEE Journal on Multiscale and Multiphysics Computational Techniques","volume":"11 ","pages":"197-211"},"PeriodicalIF":1.5,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147828993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}