Article
Mathematics, Applied
Dajana Conte, Giovanni Pagano, Beatrice Paternoster
Summary: In this work, NonStandard Finite Differences (NSFDs) numerical schemes are derived to solve a model of reaction-diffusion Partial Differential Equations (PDEs) that describes the coexistence of plant species in arid environments. The new methods exploit known properties of the exact solution and demonstrate greater stability and preservation of important model features compared to standard methods.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2023)
Article
Energy & Fuels
Ali Ranjbar, Amin Izadpanahi, Arash Ebrahimi
Summary: This study evaluates the geomechanical behavior of fractures and faults in rocks as a saturated deformable discrete fracture-porous medium using coupled fluid flow-geomechanics numerical modeling. The method presented in this paper accurately describes the effects of fractures and faults on pore pressures during fluid flow.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2022)
Article
Mechanics
Yingxue Yang, Qi Liang, Hongtong Dou, Mengyao Sun, Kun Qian, Diantang Zhang
Summary: This paper investigates the failure mechanisms of carbon/UHMWPE 2.5D woven hybrid composites under single and repeated low velocity impacts. X-ray micro-computed tomography was employed to discuss the damage distribution, and a meso-macro combination finite element model was proposed to analyze the failure mechanisms. The results demonstrated that H-2.5DWC has higher specific energy absorption and distinct toughness characteristic under single impact, and exhibits a more dispersed damage distribution as the number of repeated impacts increases, resulting in improved damage tolerance.
COMPOSITE STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Bo Zhang, Bradley Boyd, Yue Ling
Summary: Compressible interfacial multiphase flows are important fluid phenomena and numerical simulation is a useful tool to study the unclear physics behind them. In this study, a novel numerical method is developed to accurately resolve shock waves, interfaces, and their interactions. The simulation results are validated against theories, experiments, and other simulations, showing excellent agreement. This method has demonstrated its capability in capturing the viscous and capillary effects on shock-interface interaction.
COMPUTERS & FLUIDS
(2022)
Article
Energy & Fuels
Shaheryar T. Hussain, Sheikh S. Rahman, Reda A. Azim, David Haryono, Klaus Regenauer-Lieb
Summary: Oil recovery from limestone reservoirs with fractures is challenging due to lack of understanding of multiphase fluid flow and production potential. Laboratory models and fractured limestone samples were used to study the effects of fractures on fluid flow, revealing their high permeability and potential impact on oil recovery rates.
Article
Mechanics
William Bethune
Summary: This study presents a computational framework for studying fluid discontinuities and provides a numerical method along with validation cases. The framework has been successfully applied to magnetohydrodynamic shocks and shear layers, allowing for investigation into how these phenomena are altered in weakly ionized plasmas.
Article
Construction & Building Technology
Xiao-Long Gao, Kai Wu, Yi-Qing Guo, Yun-Chuan Zhao, Jun-Yuan Guo
Summary: The shear properties of the interface between UHPC and NSC using post-installed reinforcing bar connection technology were studied through a push-out test, and the suitable embedment length of the post-installed reinforcing bar in UHPC layer was determined. A bending test on damaged RC beams strengthened with UHPC layers using the bonding technology of post-installed reinforcing bar was conducted to investigate the flexural behaviors. Three-dimensional FE models were developed to simulate the strengthened RC beams and the crucial parameters were investigated. The results showed that the strengthened beams using the bonding technology of post-installed reinforcing bar effectively improved the cracking and flexural performance of damaged RC beams, without any interface cracks throughout the bending test process.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Review
Mechanics
M. A. Alves, P. J. Oliveira, F. T. Pinho
Summary: Complex fluids are engineered for specific applications by adding macromolecules to a solvent, imparting viscoelasticity which affects flow instabilities and fluid dynamics. Recent research focuses on numerical methods for simulating viscoelastic fluid flows, particularly the finite-volume method used to assess performance with benchmark flows. Issues in numerical methods and novel applications of viscoelastic fluids requiring further development are also discussed.
ANNUAL REVIEW OF FLUID MECHANICS, VOL 53
(2021)
Article
Mathematics, Applied
Yuan Chen, Songming Hou, Xu Zhang
Summary: In this paper, an immersed finite element (IFE) method is proposed for solving elastodynamics interface problems on interface-unfitted meshes. Vector-valued P1 and Q1 IFE spaces are used for spatial discretization. Important properties of these IFE spaces, such as inverse inequalities, are established, which are crucial in the error analysis. Both semi-discrete and fully discrete schemes are derived for temporal discretization. The proposed schemes are proved to be unconditionally stable and have optimal convergence rates in the energy, H2, and semi-H1 norms. Numerical examples are provided to verify the theoretical analysis and demonstrate the stability and robustness of the schemes.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Engineering, Marine
Shanti Bhushan, Oumnia El Fajri, Graham Hubbard, Bradley Chambers, Christopher Kees
Summary: This study evaluates the capability of Navier-Stokes solvers in predicting plunging breaking, showing that different parameters have an impact on predictions, and suggesting the selection of appropriate grid resolution and models for different test cases; experiments indicate that finer grids can accurately predict splash-up events but may induce interface instabilities.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Mathematics, Applied
Petr Svacek
Summary: This paper focuses on numerically approximating a simplified two-dimensional aerelastic problem involving a flexibly supported airfoil with a control section. The coupling of the control section with other modes can lead to a decrease in flutter velocity. The problem is mathematically described using a fully coupled formulation of incompressible, viscous fluid flow over a flexible structure, modeled by a system of ordinary differential equations. The numerical approximation is treated using the variational multiscale approach with the algebraic subgrid scale model, and the ALE mapping is constructed using a robust mesh deformation method. Numerical results are provided. (c) 2023 Elsevier B.V. All rights reserved.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2023)
Article
Engineering, Mechanical
Majid Haghani, Bahram Navayi Neya, Mohammad Taghi Ahmadi, Javad Vaseghi Amiri
Summary: This paper presents a new approach for seismic failure analysis of concrete gravity dams using extended finite element method and evaluates numerical parameters. The study investigates dynamic fracture behavior of cracked dams and utilizes dynamic stress intensity factors based on interaction integral. The penalty method is employed to simulate crack opening and closing, and zero thickness six-nodal contact elements are used to model interaction between dam, foundation, and reservoir. Validation studies and discussion of numerical parameters such as crack growth and mass matrix assembly demonstrate the effectiveness of the approach in seismic failure analysis.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Materials Science, Textiles
Hamid Reza Aghaei, Mehdi Varsei, Saeed Ajeli, Mehdi Kamali Dolatabadi, Mohammad Esmail Yazdanshenas
Summary: Nowadays, the use of three-dimensional fabric as a reinforcement in composites has been increasing. This study focused on the use of non-crimp three-dimensional orthogonal woven fabric to fabricate composite preforms. Torsion tests were conducted on composites made with different resin matrices, and the results showed that composites fabricated with epoxy resin exhibited higher torsional strength compared to those with polyester resin matrices. The preforms with higher fiber volume fractions also showed higher torsional strength. A multiscale finite element model was successfully used to predict the torsional behavior of composites with different fiber volume fractions.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Review
Polymer Science
Madjid Soltani, Kaamran Raahemifar, Arman Nokhosteen, Farshad Moradi Kashkooli, Elham L. Zoudani
Summary: Liquid crystal elastomers (LCEs) are materials with specific properties that can change physical characteristics when exposed to external stimuli, making them suitable for various applications. Numerical models are necessary for better understanding and predicting their behavior in different scenarios.
Article
Chemistry, Multidisciplinary
Wendy K. Caldwell, Bryan Euser, Catherine S. Plesko, Carene Larmat, Zhou Lei, Earl E. Knight, Esteban Rougier, Abigail Hunter
Summary: Large scale computational models are crucial for studying impact cratering events in the solar system, and this study benchmarks two approaches for impact cratering applications. The research discusses results for different impact velocities and directions, and compares them to previously published data. Ultimately, both methods successfully model various impact scenarios.
APPLIED SCIENCES-BASEL
(2021)
