Article
Geochemistry & Geophysics
Jin Wen, Dinghui Yang, Yuanfeng Cheng, Zhipeng Qu, Hongwei Han, Xingmou Wang, Jianbing Zhu, Xijun He, Fan Bu
Summary: Facies and petrophysical properties are important reservoir parameters in subsurface studies and are often strongly correlated. The traditional separate calculation method is inaccurate, thus we propose a new joint inversion method based on a bi-level optimization model to simultaneously determine facies and petrophysical properties, resulting in more accurate and reliable results.
GEOPHYSICAL PROSPECTING
(2023)
Article
Acoustics
Zhiyuan Ma, Tianzhi Qi, Li Lin, Mingkai Lei
Summary: This study presents a method for determining the geometric and acoustic parameters of inhomogeneous multi-layer coatings using ultrasonic technology. A new objective function combining least-squares and cross-correlation algorithm is developed, and a genetic algorithm is used to optimize the objective function to obtain global optimal solution. Experimental results show that the proposed ultrasonic inversion method is effective in characterizing the surface integrity of inhomogeneous multi-layer coatings.
Article
Mathematics, Applied
B. J. Civiletti, A. Lakhtakia, P. B. Monk
Summary: We developed a hybrid coordinate-transform method by combining the rigorous coupled-wave approach (RCWA) with transformation optics to solve the time-harmonic Maxwell equations in a 2D domain containing a surface-relief grating. Through the study of scattering problems, we proved the convergence of this method for the p-polarization state and obtained estimates for the convergence rates. Numerical testing showed faster convergence than predicted and the hybrid method avoided the Gibbs phenomenon associated with the standard RCWA.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2022)
Article
Geochemistry & Geophysics
Tim Klose, Julien Guillemoteau, Giulio Vignoli, Judith Walter, Andreas Herrmann, Jens Tronicke
Summary: Geophysical inverse problems often require regularization to provide a unique and stable solution. This study presents a structurally constrained approach for FD-EMI data inversion and demonstrates its effectiveness in reconstructing the subsurface electrical conductivity distribution, including its structural characteristics.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Mechanics
J. Y. Xiao, G. Z. Wang, J. X. Zhao, S. T. Tu, F. Z. Xuan
Summary: In this study, a general correlation equation has been established to predict constraint-dependent fracture toughness for different materials and structures. This equation provides a simple and convenient engineering method to estimate constraint-dependent ductile fracture toughness.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Nima Sarmadi, Mohaddeseh Mousavi Nezhad, Quentin J. Fisher
Summary: This study aims to find an appropriate length-scale parameter to simulate the fracturing process in a way that matches the physical character of failure in materials. The fracture process zone is chosen as the key feature, and relationships for estimating the length-scale parameter based on the tensile strength and cracking properties are proposed and verified using experimental data. A novel mesh refinement strategy is developed to increase computational efficiency.
ENGINEERING WITH COMPUTERS
(2023)
Article
Mechanics
Y. Zheng, G. Z. Wang, K. Wang, F. Z. Xuan, S. T. Tu
Summary: Considering the crack-tip constraint effect, a correlation between T0 and a unified constraint parameter Ad* has been investigated in this study. A linear T0-Ad* correlation equation has been established and validated by experimental data, showing good capability to predict the MC T0 for any cracked structures across a wide range of conditions.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Geochemistry & Geophysics
Longying Xiao, Gianluca Fiandaca, Pradip K. Maurya, Anders Vest Christiansen, Lea Levy
Summary: This paper presents an inversion scheme for 3-D TEM time-lapse data using a generalized minimum support norm and addresses the challenges of survey repetition and non-optimal data coverage. Through synthetic and field examples, the relevance and robustness of the implementation of 3-D TL inversion for TEM monitoring are demonstrated.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Environmental Sciences
Jing Xie, Yian Cui, Qifei Niu
Summary: The study evaluates the impact of adding self-potential (SP) data on the estimation of hydraulic properties of soils. Results show that incorporating SP data can reduce uncertainty in estimating hydraulic parameters. Additionally, SP data can also be used to estimate electrical properties of soils, with the saturated streaming potential coupling coefficient C-sat having the highest accuracy.
VADOSE ZONE JOURNAL
(2021)
Article
Automation & Control Systems
Sun Yangfan, Shen Hongyao, Fu Jianzhong
Summary: The proposed method in this paper deals with the toolpath planning issue for compound surfaces by identifying the parameter boundaries of sub-surfaces and obtaining the trimmed boundaries from the parameter zones, resulting in smooth toolpaths that consider the geometric features of compound surfaces.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Construction & Building Technology
Muhammad Aakif Ishaq, Filippo Giustozzi
Summary: Choosing an asphalt binder capable of withstanding low temperature cracking in the field is challenging. This study aims to determine the correlations between bitumen and asphalt tests at low temperature and finds that SCB fracture energy is a better indicator for capturing the low-temperature performance of asphalt materials.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
E. Borzabadi Farahani, B. Sobhani Aragh, A. Sarhadi, D. Juhre
Summary: A fully thermomechanical coupled phase-field model is developed to investigate austenite-to-martensite phase transformation and crack initiation and propagation in pure austenitic microstructures. The model considers latent heat transfer, temperature dependency, fracture surface energy, and damage evolution. The results demonstrate the applicability of the model in predicting fracture mechanisms in a thermomechanical field. The study highlights the significant impact of temperature on phase transformation and crack growth.
THIN-WALLED STRUCTURES
(2023)
Article
Mathematics
Jun Lu, Lianpeng Shi, Chein-Shan Liu, C. S. Chen
Summary: In this paper, a family of two-parameter homogenization functions is derived for the doubly connected domain, which is utilized as the basis of trial solutions for inverse conductivity problems. By imposing an extra boundary condition on the inner boundary, expansion coefficients are obtained, resulting in a linear system for the interpolation of the solution. The spatial- or temperature-dependent conductivity function can be retrieved by solving a linear system obtained from the collocation method applied to the nonlinear elliptic equation after inserting the solution.
Article
Mechanics
O. Rokos, R. H. J. Peerlings, J. P. M. Hoefnagels, M. G. D. Geers
Summary: Micromechanical constitutive parameters are important and pose experimental challenges for accurate identification in engineering materials. This paper addresses the parameter identification through multiscale experiments combined with Integrated Digital Image Correlation (IDIC) in conjunction with various computational homogenization schemes. The accuracy and performance of the discussed techniques are analyzed and results demonstrate high accuracy and robustness.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Cheng Chen, Xudong Qian
Summary: This manuscript presents a non-contact approach to measure the J-integral resistance (J-R) curve for sidegrooved specimens using data measured solely from the digital image correlation (DIC). It establishes a fundamental relationship between the free-surface and throughthickness averaged J values, and demonstrates that side grooves impose trivial effects on the accuracy of the DIC J-R curve measurement.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Energy & Fuels
Stefan Finsterle, Richard A. Muller, Rod Baltzer, Joe Payer, James W. Rector
Article
Energy & Fuels
Joe H. Payer, Stefan Finsterle, John A. Apps, Richard A. Muller
Article
Geochemistry & Geophysics
Michael Commer, Steve R. Pride, Donald W. Vasco, Stefan Finsterle, Michael B. Kowalsky
Article
Energy & Fuels
Stefan Finsterle, Richard A. Muller, John Grimsich, John Apps, Rod Baltzer
Article
Energy & Fuels
Alfredo Battistelli, Stefan Finsterle, Marica Marcolini, Lehua Pan
Article
Energy & Fuels
Stefan Finsterle, Cal Cooper, Richard A. Muller, John Grimsich, John Apps
Summary: The depth and layout of a horizontal borehole repository offer strong isolation of nuclear waste from the surface, but the potential compromised by the borehole used for access. Numerical calculations demonstrate that even with poor quality backfill material or deteriorated conditions, the dose contribution of radionuclides released through the access hole is small, indicating the importance of sealing the access hole in ensuring safety.
Article
Geochemistry & Geophysics
Michael Commer, David L. Alumbaugh, Michael Wilt, Abdullah Cihan, Evan S. Um, Robin Petrusak, Jens T. Birkholzer
Summary: Reservoir integrity stewardship during carbon capture and sequestration requires fluid extraction and reinjection as a risk-mitigating method. Crosswell electromagnetics is a technically viable monitoring method, but there are challenges when sequestering deep gas into saline aquifers.
Article
Energy & Fuels
Stefan Finsterle, Richard A. Muller, John Grimsich, Ethan A. Bates, John Midgley
Summary: The analysis of deep vertical boreholes for spent nuclear fuel assemblies suggests that such a repository has the potential to safely dispose of certain waste streams, given the depth and stable hydrogeological environment encountered in the emplacement zone provide inherent long-term isolation, allowing for reduced reliance on a complex engineered barrier system.
Review
Energy & Fuels
Stefan Finsterle, Bill Lanyon
Summary: The safety case for a radioactive waste repository relies on numerical models to assess long-term performance. It is important to critically evaluate and validate these models in order to justify confidence in the inferences drawn from them. This article discusses the issues surrounding model validation, particularly in the context of radioactive waste isolation. The focus is on validating hydrogeological models for understanding the evolution of the repository system and how these results can be used to support policy decisions.
Article
Engineering, Chemical
Curtis M. Oldenburg, Stefan Finsterle, Robert C. Trautz
Summary: In this study, we investigated the phenomenon of water upconing to the hydrogen withdrawal well in underground hydrogen storage (UHS) reservoirs using both analytical solution and numerical simulation. The results showed that horizontal permeability is the main parameter controlling the height of upconing, and injection/withdrawal cycles can mitigate this phenomenon. Reservoirs with high horizontal permeability are preferred for avoiding upconing, and minimizing withdrawal rate and maximizing the distance from well to gas-water interface or the length of the perforated well interval are important engineering controls to minimize upconing.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Geography, Physical
Ryan W. Webb, Keith Jennings, Stefan Finsterle, Steven R. Fassnacht
Summary: The study used the SnowTOUGH model to simulate the flow of liquid water in snowpacks at different elevations, revealing the significant impact of longitudinal intra-snowpack flow on hydrological modeling, especially near the treeline and when the snow surface is not actively melting.
Article
Engineering, Civil
Jin-Seop Kim, Geon-Young Kim, Min-Hoon Baik, Stefan Finsterle, Gye-Chun Cho
GEOMECHANICS AND ENGINEERING
(2019)