Article
Computer Science, Interdisciplinary Applications
Erik U. Gallardo-Romero, Diego Ruiz-Aguilar
Summary: The study presents a 3D magnetotelluric forward modeling program, which uses high-order edge elements and the Edge Finite Element method to accurately simulate magnetotelluric data. The program is open-source and optimized for both HPC and nonHPC architectures, providing highly accurate solutions for multiple frequencies with reduced computing times.
COMPUTERS & GEOSCIENCES
(2022)
Article
Geochemistry & Geophysics
Jian Li, Rongwen Guo, Jianxin Liu, Yongfei Wang, Xulong Wang
Summary: In this paper, an efficient algebraic multi-resolution sampling (MRS) method is proposed for finite-difference magnetotelluric (MT) forward modelling. The method obtains the coefficient matrix for subsampled components by matrix multiplication and ensures divergence-free current during the iterative solution process. The results show improved stability and efficiency compared to unsampled staggered grids.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Zhihao Rong, Yunhe Liu, Changchun Yin, Xinpeng Ma, Luyuan Wang, Changkai Qiu, Bo Zhang, Xiuyan Ren, Yang Su
Summary: We propose a novel smoothing regularization scheme for 3-D magnetotelluric inversion based on unstructured tetrahedral discretization. By transforming the model into a constraint domain and using gradient filtering, our method achieves smoother model updates compared to conventional explicit smoothing methods. Numerical results on synthetic data and USArray data demonstrate that our new strategy improves convergence speed and provides more reliable underground structures with better data fitting.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Mikhail Kruglyakov, Alexey Kuvshinov
Summary: This paper introduces a method for modelling magnetic tippers in spherical geometry to study the distribution of electrical conductivity on a global scale. By using a proposed source model and a developed solver, the electromagnetic field in a spherical shell is accurately calculated and the results of modelling the ocean induction effect are presented.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Chaojian Chen, Mikhail Kruglyakov, Alexey Kuvshinov
Summary: This paper introduces an efficient 3-D EM modelling tool based on a multinested IE approach, which conducts modelling on a larger domain and coarse grid, then refines results in a smaller domain and denser grid. By using FFT for matrix-vector multiplications, the computational efficiency is improved.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Mechanics
M. A. Agwa, A. Pinto da Costa
Summary: In this paper, a numerical examination was conducted on the quasistatic incremental problem of a two degree of freedom elastic system in the presence of a frictional rectilinear obstacle to study the existence or occurrence of multiple solutions. The study found that the critical friction coefficient for solution uniqueness in finite element models depends on the Poisson's ratio and slender structures with respect to the obstacle lead to smaller coefficients of friction. The algorithm used for computations verified the sharpness of the frictional coefficient estimates corresponding to different criteria for solution uniqueness in the quasi-static incremental problem.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Energy & Fuels
Yang Yang, Bin Xiong, Sanxi Peng, Hanbo Chen, Tianyu Zhang, Lu Liu
Summary: Geothermal resources are important renewable energy sources with high development potential, but their exploitation involves significant hazards. Geophysical methods, such as TEM and CSAMT, are effective and accurate in determining the depth and location of geothermal resources. This study establishes a simplified geothermal system resistivity model and simulates the abilities of TEM and CSAMT in distinguishing target faults with different resistivities, dip angles, and widths. The effectiveness of these methods in exploring geothermal resources is demonstrated through a case study in Huairen County, Shanxi Province, China.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Mathematics, Applied
Weimin Han, Chenghang Song, Fei Wang, Jinghuai Gao
Summary: The paper introduces semi-discrete and fully discrete numerical methods for solving the diffusive-viscous wave equation and derives optimal error estimates. Numerical results on a test problem illustrate the numerical convergence orders.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Civil
R. Durand, J. F. Vieira, M. M. Farias
Summary: This research proposes a numerical method for simulating prestressed RC beams using advanced finite element models. The method provides realistic simulations and detailed information on deformability, crack patterns, and stress distributions. It includes cohesive elements for simulating concrete fracture, rod elements for simulating reinforcements, and contact elements for predicting relative displacements between rebars and concrete. The method has been validated with experimental data and is capable of capturing the behavior of prestressed RC beams.
ENGINEERING STRUCTURES
(2023)
Article
Physics, Mathematical
Meiling Zhao, Jiahui He, Liqun Wang
Summary: This paper investigates the electromagnetic scattering from overfilled cavities with inhomogeneous anisotropic media. A Petrov-Galerkin finite element interface method on non-body-fitted grids is presented to solve the scattering problem. By introducing a transparent boundary condition, the infinite domain of scattering is reduced to a bounded domain problem. The proposed method can handle matrix coefficients produced by permittivity and permeability tensors of anisotropic media, and the final linear system is sparse, making it suitable for most iterative methods.
COMMUNICATIONS IN COMPUTATIONAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Carlos A. A. Vargas, J. Sebastian Gomez, Juan J. J. Gomez, Juan M. M. Solano, Alexander Caneva
Summary: In this study, we used multi-temporal 1D-magnetotelluric (MT) surveys to analyze the variations in apparent resistivity rho(u) and its correlation with seismic activity in central Colombia. By analyzing the time series data of natural electric and magnetic fields in two MT stations, anomalies were identified eight hours prior to the Mesetas earthquake, suggesting that they might be related to fluid migration caused by stress changes before, during, and after the earthquake.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Min-Han Oh, San Kim
Summary: This paper introduces an automatic procedure that enhances the solution accuracy of edge-based smoothed 2D solid finite elements by using an adaptive enrichment scheme that does not require mesh-refinement. By estimating error and assigning cover functions adaptively, the proposed scheme achieves higher order strain fields within the finite elements, improving accuracy and efficiency.
APPLIED SCIENCES-BASEL
(2021)
Article
Geochemistry & Geophysics
F. Zyserman, L. B. Monachesi, A. H. Thompson, T. D'Biassi, L. Jouniaux, P. Gauzellino
Summary: This work presents numerical modelling of electroseismic conversions with electric field sources in the atmosphere. It shows that layered structures of conductivity anomalies can generate rotated electric fields at reservoir depths. However, the high-power dipole sources limit the practical application of these methods in hydrocarbon exploration. The research explores the potential use of environmental electric fields to create useful electroseismic conversions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Acoustics
Giorgio Pulvirenti, Nicolas Totaro, Etienne Parizet
Summary: Sound perception is crucial in many industrial applications, especially in the automotive industry where the prediction and description of sound quality is important. Numerical methods, like the Finite Elements Method (FEM), are commonly used but require significant computational resources. This study explores the sensitivity of human perception to numerical parameters in FEM models for exterior acoustic problems and evaluates the impact of these differences on sound properties using psychoacoustic metrics and jury tests.
Article
Computer Science, Interdisciplinary Applications
Arturo Popoli, Andrea Cristofolini, Leonardo Sandrolini
Summary: This work presents a numerical methodology for calculating currents and voltages induced on underground pipelines by nearby overhead power lines, extending a previously developed quasi-3D methodology to investigate nonparallel routings of pipelines with respect to power lines. Utilizing discretization of the pipeline path and treating each segment as an electrical multi-port component, the study successfully simulated the consequences of crossings between pipelines and power lines.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2021)