In this paper, we present a flexible and efficient ternary parallelization approach for the multilevel fast multipole algorithm (MLFMA) solution of extremely large 3-D scattering problems with over 10 billion unknowns. approach, binary clustering tree all message passing interface (MPI) processes is built first. Then, MLFMA categorized into plane wave partitioning, hierarchical-structure box partitioning (BP) levels via top-down to match process tree. Compared bottom-up interprocess...

Summary Well interference is a common phenomenon between wells observed in unconventional reservoirs, which has received significant attention. It plays an important role well-spacing considerations. Massive hydraulic fractures are generated horizontal by multistage hydraulic-fracturing treatments and result well adjacent wells. However, very little work been completed to understand how massive cause interference. In this study, we analyzed dynamic-stress evolution multiple-fracture...

The design challenge of new functional composite materials consisting multiphase has attracted an increasing interest in recent years. In particular, understanding the role distributions ordered and disordered particles a host media is scientifically technologically important for designing novel devices with superior spectral angular properties. this work, effective medium property hyperuniformly distributed hard at different filling fractions investigated. To accurately extract permittivity...

The asymptotic waveform evaluation (AWE) technique has been widely used in the method of moment (MoM), finite element (FEM), and hybrid element-boundary integral (FE-BI) for fast computation over a wide frequency band. However, how to apply AWE multilevel multipole algorithm (MLFMA) still remains challenge. This paper proposes an efficient robust approach integral-multilevel (FE-BI-MLFMA). validity proposed is verified by numerical examples scattering problems. Numerical experiments show...

Automatic dependent surveillance-broadcast (ADS-B) has been widely deployed on aircraft to facilitate aviation information exchange and improve air traffic safety. However, its broadcast nature lack of security considerations like encryption authentication have caused the counterfeit ADS-B messages be straightforward. Flooding forged legitimate aircraft, denial-of-service (DoS) attacks threaten flight severely. In this paper, we propose a practical solution against DoS based high-precision...

Relying on the reception and analysis of signals already present in environment, has various applications across different domains, from acoustics to electromagnetics. However, growing signal bandwidth poses tremendous challenges data transmission, highlighting advantages compressive sensing (CS) technique. In this study, we investigate direct position determination (DPD) using sub-Nyquist sampling directly without reconstruction full first. Leveraging Hadamard matrix as CS measurement...

The discrete complex image method (DCIM) has been widely used to analytically approximate the Sommerfeld integrals (SIs) of Green's functions in layered media. This greatly improved accuracy and generality past years, but resulted a large amount images. It is found that using so many images for SI approximation moment (MoM) applications redundant inefficient. To reduce number images, technique by means genetic algorithm proposed applied MoM solution half-space mixed-potential integral...

This paper focuses on the trusted vessel position acquisition using passive localization based booming low-earth-orbit (LEO) satellites. As high signal-to-noise ratio (SNR) reception cannot always be guaranteed at LEO satellites, recently developed direct determination (DPD) is adopted. For satellite-based systems, an efficient DPD challenging due to excessive exhaustive search range leading from broad satellite coverage. In order reduce computational complexity, we propose a time difference...

A three-dimensional finite element numerical modeling for the scanning microwave microscopy (SMM) setup is applied to study full-wave quantification of local material properties samples. The takes into account radiation and scattering losses nano-sized probe neglected in previous models based on low-frequency assumptions. techniques approach curves constant height are implemented. In addition, we conclude that SMM has potential use as a broadband dielectric spectroscopy operating at higher...

Beamspace multiple-input multiple-output (B-MIMO) provides a promising solution for reducing the number of required expensive radio frequency (RF) chains without obvious performance loss. However, high computational complexities beam selection algorithms prohibits their practical applications in 5G millimeter wave (mmWave) massive MIMO communication systems. Reviewing existing procedures and using matrix perturbation theory, complexity reduction on beamspace is considered this letter. Two...

An efficient gridless semianalytical model was developed to simulate real gas transport in shale formation with nanopores and complex fracture geometry. This incorporates multiple physics such as desorption, adsorbed porosity, slippage diffusion, residual water saturation, non‐Darcy flow, choke skin, pressure‐dependent matrix permeability, conductivity. Additionally, this is easy handle geometry through dividing fractures into a number of segments nodes. We verified the against numerical an...

To enhance the capability of characteristic mode analysis (CMA) for electrically large problems, fast multipole algorithms (FMAs) are incorporated into this increasingly popular technique in antenna community. In communication, an improvement formulation CMA with FMAs is presented and studied. Numerical results show that proposed has a better convergence behavior than previous when it used platforms.

An efficient algorithm is presented for accurately calculating electromagnetic (EM) scattering from multiple impedance boundary condition (IBC) targets, and individual unit in the group dealt with separately based on combined self-dual IE (C-SDIE). To rapidly analyze targets IBC, translation matrix concept of multilevel fast multipole (MLFMA) applied to calculate EM coupling between targets. One advantage this approach its capability reusing data structures identical In addition, it...

Surface discontinuities (SDs), such as cylindrical protrusions or dents, are commonly found on artificial aircraft vehicle surfaces. Despite being electrically small in size, their sheer quantity can significantly affect the scattering characteristics of target. Due to large contrast between surface discontinuity and surrounding geometry, efficient analysis these targets is technically challenging both mesh generation numerical simulation. In this communication, two novel basis functions...

Two foremost barriers to the development of fast and efficient simulation algorithms for electromagnetic problems in half-space planar media are Sommerfeld integral evaluation techniques solvers. In this paper, we focus on challenging these two difficulties impedance boundary half-space, which is a proper model common air-lossy half-space. Based Laplace transformation, first propose an alternative exact image representation Green's function. addition its absolute convergence property, new...

Swarm targets consisting of multiple aircraft, such as unmanned aerial vehicles (UAVs), have become an emerging tool in modern applications due to their agility and vast coverage. Because the complicated coupling shading effects among different units, accurate, flexible, computationally efficient scattering analysis for this novel target remains challenging. To overcome difficulty, work, a so-called plane wave expansion (PWE) algorithm is proposed. Unlike multilevel fast multipole (MLFMA),...

This communication investigates the discontinuous Galerkin (DG) integral equation for scattering problems in a half-space environment. However, extending DG scheme that allows nonconformal mesh on this formulation is not straightforward. The correct DG-mix-potential (MPIE) implementation first derived and explained, it points out underlying constraint when transferring divergence operator electric current method of moments (MoM) discretization MPIE. Extensive multiscale simulations are...

The increasingly popular characteristic mode analysis (CMA) techniques in the free-space have been well-established, while half-space counterpart is less concerned. In this communication, we consider CMA for platforms such as vehicles on ground and ships sea surface, which also commonly mounted with antennas. To overcome difficulty of CMA's application electrically large targets, multilevel fast multipole algorithm integrated into eigensolver. Numerical results realistic from FM-band to...

The rapid growth of maritime transportation and its regularization have imposed an increasing demand for developing a global surveillance capacity. existing cooperative traffic monitoring relies on the shipborne automatic identification system (AIS), which is now confronting severe security threats due to vulnerabilities AIS at both implementation protocol levels. In this article, possibility passive signal localization using low Earth orbit satellite constellations investigated, provides...

To mitigate the huge investment in radio-frequency devices and associated high power consumption of modern base stations, beamspace multiple-input multiple-output (B-MIMO) has become a promising solution at an expense acceptable performance degradation. Facing increasingly data throughput demand, two-dimensional (2D) massive B-MIMO systems with beams steering over both elevation azimuth angles have been developed recently. However, such large number available for wireless communication,...

A flexible and efficient Hierarchical LU (H-LU)-based preconditioner (H-LU-P) is presented for the hybrid finite element-boundary integral (FE-BI) multilevel fast multipole algorithm solving three-dimensional scattering by inhomogeneous objects. The formulation of FE-BI first approximated using locally operators BI part to construct a element method-absorbing boundary condition (FEM-ABC) based preconditioning matrix. Then, matrix equation solved nested dissection accelerated H-LU-based...

The breaking wave is the primary factor causing complicated scattering characteristics of sea surface. In this work, electromagnetic waves analyzed from multiphysics point view. development a canonical plunging in deep-water numerically simulated by solving non-linear hydrodynamic equation. Meantime, developing for different polarizations at times are using 2D finite element method. Numerical results reveal stages process and under polarizations.