Article
Mathematics, Applied
Wangtao Lu, Liwei Xu, Tao Yin, Lu Zhang
Summary: This paper develops a highly accurate boundary integral equation (BIE) solver for acoustic scattering problems in locally defected layered media using the perfectly matched layer (PML) technique. The solver is based on the use of PML and standard integral operators, and enables the derivation of BIEs on local defects. Numerical experiments demonstrate the accuracy and efficiency of the solver.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2023)
Article
Engineering, Geological
Junwei Chen, Yundong Shou, Xiaoping Zhou
Summary: A novel element and method are proposed in this paper, applying PML theory in FEM and combining with viscoelastic model and Newmark algorithm to efficiently absorb outgoing waves.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Anh-Khoa Chau, Michael Brun, Thomas Elguedj
Summary: This paper presents an isogeometric formulation of the Perfectly Matched Layer (PML) for two-dimensional elastodynamics in unbounded media. The PML formulation is discretized in space using B-spline basis functions of increasing polynomial order. Implicit time integration is used in the PML subdomains, while explicit time integration is used in the physical domain. The coupling between non-conforming IGA-patches for the PML subdomains and the physical domain is carried out using a standard mortar method.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Electrical & Electronic
Shuqi Wang, Xuan Wei, Yuanguo Zhou, Qiang Ren, Yunfeng Jia, Qing Huo Liu
Summary: A new conformal perfectly matched layer (PML) based on the discontinuous Galerkin time-domain (DGTD) method is introduced to truncate the 3-D open domain, significantly reducing buffer space. By constructing the PML in an orthogonal curvilinear coordinate system and defining conductivities to absorb outgoing waves, the analytical expression of the 3-D conformal PML is derived. Hierarchical vector basis functions are chosen to discretize the conformal PML and physical region, maintaining accuracy while reducing total degrees of freedom (DoFs).
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Multidisciplinary
Guoliang Zhang, Mi Zhao, Junqi Zhang, Jinting Wang, Xiuli Du
Summary: This paper introduces a novel direct time-domain artificial boundary condition for wave problems in 3D unbounded fluid-saturated poroelastic medium. It overcomes the limitations of traditional methods and allows for the utilization of artificial boundaries with general geometries and extending to infinity.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Y. B. Yang, Jie Li, Q. Q. Nie, Z. Y. Zhou, H. Xu
Summary: In this paper, a novel hybrid artificial boundary method is proposed for simulating the dynamic response of semi-infinite problems. The method combines the perfectly matched layer (PML) and infinite element method (IEM) for the far field simulation, while using the finite element method (FEM) for the near field. The new hybrid artificial boundary (PML-IEM) is designed to take advantage of each method's strengths.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Engineering, Multidisciplinary
Anthony Royer, Christophe Geuzaine, Eric Bechet, Axel Modave
Summary: This work presents a non-overlapping substructured DDM with PML transmission conditions for checkerboard decompositions, considering cross-points. The continuity of Dirichlet traces is enforced at the interfaces between subdomains and PMLs using Lagrange multipliers, allowing for the computation of Neumann traces and the use of PMLs as discrete operators approximating the exact Dirichlet-to-Neumann maps.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Guoliang Zhang, Mi Zhao, Xiuli Du, Junqi Zhang
Summary: A novel artificial boundary method called the scaled boundary perfectly matched layer (SBPML) is proposed for the transient analysis of elastic wave propagation in unbounded domains. The method constructs a generalized perfectly matched layer (PML) around the finite interior subdomain based on a coordinate transformation inspired by the scaled boundary finite element method (SBFEM). It can model the infinite exterior subdomains of heterogeneous materials, featuring both parallel and radial straight-line physical surfaces and interfaces.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Jon Vegard Venas, Trond Kvamsdal
Summary: The work presents a spline-based PML formulation, which improves the simplicity and accuracy of PML. This method can be automatically applied to any convex artificial boundary, eliminating restrictions on domain construction with PML and improving mesh quality.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Naixing Feng, Yingshi Chen, Yuxian Zhang, Mei Song Tong, Qingsheng Zeng, Guo Ping Wang
Summary: An alternative computation approach for absorbing boundary condition (ABC) based on deep differentiable forest (DDF) model is proposed to replace the conventional perfectly matched layer (PML) during the finite-difference time-domain (FDTD) computation process. The DDF combines the advantages of trees and neural networks, and has been shown to achieve satisfactory numerical accuracy in numerical benchmarks.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2021)
Article
Acoustics
Fengxi Zhou, Zhixiong Zhou, Qiang Ma
Summary: This article proposes a novel type of vibration isolation barrier, an open trench-wave impedance block, to reduce the impact of ground vibration in vibration pollution. The vibration isolation performance of the barrier system is investigated using the finite element method in the frequency domain, and the effects of physical parameters, geometric parameters, and load parameters are analyzed.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Engineering, Multidisciplinary
Yongzhen Mi, Xiang Yu
Summary: This paper introduces an isogeometric formulation of the perfectly matched layer (PML) for time-harmonic acoustic simulations, which utilizes complex coordinate stretching and interpolation methods for calculating stretching vectors. The proposed method demonstrates superior computational accuracy and high geometric adaptivity in numerical examples.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Bin Zou, Jincheng Chang, Shuo Liu, Lamei Zhang
Summary: This letter presents an efficient 3-D finite-difference time-domain method with weighted Laguerre polynomials (WLP-FDTD) using the modified convolution perfectly matched layer (CPML). A factorization-splitting scheme is employed to achieve high efficiency. Numerical results are provided to validate the absorption performance and efficiency of the proposed CPML.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Energy & Fuels
Ruo-Long Song
Summary: In the numerical simulation of wave propagation, the role of both viscoelastic materials and perfectly matched layers (PMLs) in attenuating waves is significant. However, the treatment of convolution operators in the finite-difference time-domain (FDTD) method is challenging. To address this issue, substantial progress has been made in replacing convolution with time stepping in FDTD. Introducing PML into viscoelastic media requires the introduction of additional memory variables, leading to increased code complexity and computation costs. This study proposes a viscoelastic model, which can function as a viscoelastic material and/or a PML by adjusting the parameters, by modifying the nonsplitting PML formulation. Compared to existing PML methods, the proposed method requires less memory and is easier to implement in existing finite-difference codes. The numerical examples demonstrate the stability of the method for materials with high absorption and heterogeneous media with large contrast of acoustic impedance and viscosity.
Article
Mathematics
Yongou Zhang, Zhongjian Ling, Hao Du, Qifan Zhang
Summary: Understanding the effect of vortexes on sound propagation is important for target detection and acoustic imaging. This study presents a prediction algorithm for two-dimensional vortex scattering using a finite-difference frequency-domain numerical scheme with perfectly matched layers. The algorithm demonstrates good convergence and effective absorbing boundary conditions when the mesh corresponds to over 15 nodes per wavelength. Results show that the absorption coefficient varies linearly with the density of the medium and the incident wave frequency for different vortex scattering cases. Moreover, a PML boundary with a thickness greater than 2.5 times the wavelength effectively absorbs the scattering sound, providing a reliable algorithm for studying the effect of vortexes on sound propagation.
Article
Chemistry, Multidisciplinary
Noel S. Gunning, Joseph Feser, Matt Beekman, David G. Cahill, David C. Johnson
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2015)
Article
Physics, Applied
Bivas Saha, Yee Rui Koh, Joseph P. Feser, Sridhar Sadasivam, Timothy S. Fisher, Ali Shakouri, Timothy D. Sands
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Chemistry, Physical
J. Carrete, B. Vermeersch, L. Thumfart, R. R. Kakodkar, G. Trevisi, P. Frigeri, L. Seravalli, J. P. Feser, A. Rastelli, N. Mingo
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Physics, Applied
L. Thumfart, J. Carrete, B. Vermeersch, N. Ye, T. Truglas, J. Feser, H. Groiss, N. Mingo, A. Rastelli
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2018)
News Item
Chemistry, Physical
Joseph P. Feser, Jayakanth Ravichandran
Article
Physics, Applied
Rohit R. Kakodkar, Joseph P. Feser
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Physics, Applied
Joseph P. Feser
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Physics, Applied
Sourjyadeep Chakraborty, Hiroshi Uchiyama, Magnus Garbrecht, Vijay Bhatia, Ashalatha Indiradevi Kamalasanan Pillai, Joseph Patrick Feser, Devashibhai T. Adroja, Sean Langridge, Bivas Saha
APPLIED PHYSICS LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Md Abu Jafar Rasel, Ashutosh Giri, David H. Olson, Chaoying Ni, Patrick E. Hopkins, Joseph P. Feser
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Chemistry, Physical
Dheemahi Rao, Ongira Chowdhury, Ashalatha Indiradevi Kamalasanan Pillai, Gopal K. Pradhan, Satyaprakash Sahoo, Joseph Patrick Feser, Magnus Garbrecht, Bivas Saha
Summary: Researchers introduced native defects into ScN thin films through lithium ion irradiation and found that these defects positively impact ScN's thermoelectric properties by increasing its Seebeck coefficient and reducing its thermal conductivity.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ning Ye, Joseph P. Feser, Sridhar Sadasivam, Timothy S. Fisher, Tianshi Wang, Chaoying Ni, Anderson Janotti
Article
Materials Science, Multidisciplinary
Rohit R. Kakodkar, Joseph P. Feser
Article
Nanoscience & Nanotechnology
Haoqi Li, Yaroslav V. Aulin, Laszlo Frazer, Eric Borguet, Rohit Kakodkar, Joseph Feser, Yan Chen, Ke An, Dmitriy A. Dikin, Fei Ren
ACS APPLIED MATERIALS & INTERFACES
(2017)
Article
Materials Science, Multidisciplinary
Sridhar Sadasivam, Ning Ye, Joseph P. Feser, James Charles, Kai Miao, Tillmann Kubis, Timothy S. Fisher