Article
Mathematics, Applied
P. B. Ryzhakov, J. Marti, N. Dialami
Summary: A finite element-based model for analyzing incompressible flows in flexible channels is presented in this work. The model treats the fluid-solid interaction problem in a monolithic way, using an arbitrary Lagrangian/Eulerian framework. The governing equations for both sub-domains are solved on a single moving grid, with the mesh-moving strategy and the constitutive equation coefficients as the distinguishing factors. The unified formulation of the governing equations and the use of a semi-Lagrangian interface mesh-motion algorithm result in a coupled problem formulated in terms of a unique kinematic variable. The model exhibits high convergence rates when used with an algebraic multigrid linear solver.
JOURNAL OF SCIENTIFIC COMPUTING
(2022)
Article
Computer Science, Information Systems
Liping Zhang, Yue Zhu, Wei Ren, Yinghan Wang, Kim-Kwang Raymond Choo, Neal N. Xiong
Summary: Existing authentication schemes for electric vehicle charging face limitations such as lack of anonymity and failure to consider charging peaks, resulting in potential inability to meet low energy consumption requirements in smart grid environments. To address these limitations, an efficient Chebyshev polynomials algorithm has been proposed, leading to the construction of an energy-efficient authentication and key negotiation scheme for smart grid environments.
IEEE INTERNET OF THINGS JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Stefano Pezzano, Regis Duvigneau
Summary: This work develops a high-order, fully conservative discretization method for sliding grids, which can be applied to compressible flows at different regimes. The proposed approach combines a discontinuous Galerkin formulation for Navier-Stokes equations with rational representations from Isogeometric Analysis, resulting in a watertight and fully conservative sliding grid algorithm. The method's convergence rate is rigorously established, and its accuracy and robustness are demonstrated for different flow regimes.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Meteorology & Atmospheric Sciences
Daosheng Xu, Dehui Chen, Kaixin Wu
Summary: The study demonstrates that high-order finite difference schemes show significant advantages in the Global/Regional Assimilation and Prediction System, particularly in cases with smoothly varying grid distances. Compared to low-order schemes, high-order schemes perform better in discontinuous square wave testing.
ADVANCES IN ATMOSPHERIC SCIENCES
(2021)
Article
Mathematics, Applied
Bo An, J. M. Bergada, W. M. Sang
Summary: In this paper, a new strategy of the multigrid method is proposed to improve the convergence speed of numerical simulations using the lattice Boltzmann method. The simplified multigrid algorithm is based on the popular V-cycle multigrid algorithm and is validated through simulations of the lid-driven cavity flow. The novelty of this algorithm lies in the construction of the information transferring process, where the fluid information is transferred from coarse to fine meshes without using a restriction operator.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Meteorology & Atmospheric Sciences
Walter M. Hannah, Andrew M. Bradley, Oksana Guba, Qi Tang, Jean-Christophe Golaz, Jon Wolfe
Summary: The study demonstrates an alternative high-order, element-based mapping approach used in E3SM to implement a quasi-equal-area, finite volume physics grid. Simulations with different divisions of physics grids show that the alternative physics grid does not fundamentally alter the model solution and can increase the throughput of physics calculations. The reduction of physics columns with a 2 x 2 grid can significantly impact model performance, leading to improved efficiency or throughput depending on resource configuration.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2021)
Article
Mathematics, Interdisciplinary Applications
Mudassir Shams, Naila Rafiq, Nasreen Kausar, Praveen Agarwal, Nazir Ahmad Mir, Yong-Min Li
Summary: This paper develops an optimal family of fourth-order iterative techniques for finding a single root and generalizes them for simultaneously finding all roots of a polynomial equation. Convergence study reveals that the optimal convergence order is 4 for single root finding methods, while it is 12 for simultaneous methods. Computational cost and numerical illustrations demonstrate that the newly developed family of methods outperforms previous methods available in the literature.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2022)
Article
Mathematics, Applied
Mudassir Shams, Nasreen Kausar, Serkan Araci, Georgia Irina Oros
Summary: The roots of non-linear equations are a challenge in various fields, and different methods have been used to approach this problem. For approximating all the roots, sequential iterative algorithms need to use a deflation strategy to deal with rounding errors. This study aims to develop an efficient numerical scheme for approximating the roots of non-linear equations, and the results show that the recently developed simultaneous methods outperform existing methods in terms of accuracy, validation, error, computational CPU time, and residual error.
Article
Engineering, Mechanical
Marcus Ricker, Tania Feiri, Konstantin Nille-Hauf
Summary: This paper investigates the computational performance of sampling techniques in structural element design using a newly developed R package. The study compares these techniques in terms of accuracy and computational efficiency and finds that they can provide high precision solutions with satisfactory computational efficiency. The paper also explores the potential of using the R package to select probability-based safety methods.
PROBABILISTIC ENGINEERING MECHANICS
(2022)
Article
Automation & Control Systems
Cheng Cheng, Shaojun Xie, Qiang Qian, Junqing Lv, Jinming Xu
Summary: In this article, a systematic comparative assessment for selecting different measurements and controlled outputs in grid-following control of LCL-type grid-connected inverters is introduced. The sub- and supersynchronous oscillation issues induced by grid faults, lower current reference, high phase-locked loop bandwidth, and large grid inductance are investigated. The correctness of the theoretical analysis is verified through a series of steady-state and transient experimental tests.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Optics
Peiming Li, Haixiao Zhao, Wenjie Jiang, Zexin Zhang, Baoqing Sun
Summary: Single-pixel imaging (SPI) uses structured illumination light field and a single-pixel detector to form images, with certain advantages. This study investigates the influence of an obstacle aperture in the detection part of SPI and analyzes its properties through experiments and geometric optics.
Article
Computer Science, Information Systems
Kaumudi Singh, Vasanth T. Kumar, T. Prabhakar, Joy Kuri
Summary: In an IoT network, quick and efficient access to network resources is critical for timely data communication. The proposed algorithms, such as "Device Registration" and "Sparse Beacon Advertisement," have shown to increase success rates of accessing resources and reduce joining times in experimental evaluations.
Article
Computer Science, Interdisciplinary Applications
Arijit Sinhababu, Sathyanarayana Ayyalasomayajula
Summary: This paper investigates the residual aliasing error of the second order Runge-Kutta-based Random Phase Shift Method (RPSM) in under-resolved flows with strong gradients. It demonstrates that RPSM is almost as accurate as other schemes but with lower computational cost, and remains stable in under-resolved conditions. It also shows that the 2/3 Truncation scheme becomes more computationally expensive when aiming for the same level of accuracy compared to other schemes like 3/2 Padding.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2021)
Article
Mathematics, Applied
Ramandeep Behl, Himani Arora
Summary: This paper presents a new three-point iterative scheme that achieves seventh-order convergence for obtaining the solution of nonlinear systems. The scheme stands out for its minimal computational cost compared to existing methods. The theoretical analysis of the scheme's convergence properties is provided, and its applicability is demonstrated on six different types of nonlinear models.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2022)
Article
Mechanics
Lufs D. C. Ramalho, Isidro J. Sanchez-Arce, Raul D. S. G. Campilho, Jorge Belinha
Summary: The study applied NNRPIM to predict strength in a material structure and validated its effectiveness by comparing it to FEM. The CLS criterion was accurate for brittle materials but showed limitations when applied to ductile adhesives.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
Yi Wang, Yan Wang, Zhe Cheng
Article
Polymer Science
Yi Wang
Editorial Material
Thermodynamics
Yi Wang, Bo Yu, Filippo Berto, Weihua Cai, Kai Bao
ADVANCES IN MECHANICAL ENGINEERING
(2019)
Article
Engineering, Environmental
Shengli Liu, Yi Wang, Yongtu Liang
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2020)
Article
Energy & Fuels
Jingfa Li, Xiaolin Fan, Yi Wang, Bo Yu, Shuyu Sun, Dongliang Sun
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)
Article
Energy & Fuels
Yi Wang, Baoying Wang, Yang Liu, Yongtu Liang
Article
Energy & Fuels
Yueqiang Zhu, Peng Wang, Yi Wang, Ruikang Tong, Bo Yu, Zhiguo Qu
Summary: A new assessment index is defined to evaluate the gas supply reliability of individual users by combining gas shortage time and severity, and the assessment is conducted from various perspectives including entire pipeline networks, individual users, gas shortage amount, and gas shortage time. An operation state determination model of pipeline networks is established based on failure and repair processes, and a systematic assessment method with dynamic characteristics is proposed. The assessment results can provide a theoretical basis for optimizing the gas supply reliability of pipeline networks.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Lianghui Guo, Yi Wang, Bohong Wang, Nianrong Wang, Lei Zhang, Youwang Chen
Summary: A simplified semi-empirical model was developed to model the solubility of carbon dioxide in aqueous solutions of methyldiethanolamine and monoethanolamine. The model takes into account both chemical equilibria in the liquid phase and physical equilibria between the liquid and vapor phases, and shows good predictive ability.
FLUID PHASE EQUILIBRIA
(2022)
Article
Environmental Sciences
Yi Wang, Lianghui Guo, Bohong Wang, Jiri Jaromir Klemes
Summary: Chemical absorption method is important for CO2 separation, but it consumes a large amount of energy. Developing an absorbent with high absorption capacity and low energy consumption is crucial. This study proposes a graphical method, Derivative analysis of standardised vs variables diagram (DSVD), to optimize the mixing ratio of amines, which helps reduce energy consumption and increase absorption capacity.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Computer Science, Interdisciplinary Applications
Weilong Ni, Yongtu Liang, Zhengbing Li, Qi Liao, Siya Cai, Bohong Wang, Haoran Zhang, Yi Wang
Summary: This paper proposes a method for evaluating the resilience of supply chains and applies it to demand management in the downstream oil supply chain. Through quantitative analysis and Monte Carlo simulation of multiple scenarios, it is concluded that increasing inventory and improving repair rates can enhance the resilience of the supply chain.
COMPUTERS & CHEMICAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Wendi Xue, Yi Wang, Zhe Chen, Hang Liu
Summary: Underground gas storage formed from fractured depleted oil/gas reservoirs has potential for storing large quantities of natural gas. To address the absence of a numerical model, we propose an integrated model that considers the wellbore, reservoir, and gas properties. This model incorporates a gas flow direction factor, transient heat transfer models, and accurate gas property models. We analyze stability, efficiency, and global mass conservation of the reservoir model and propose a new source term equation and a pressure correction method for stable and efficient solution. Simulation results show improved efficiency and strict global mass conservation.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Renfu Tu, Qi Liao, Ning Xu, Xuemei Wei, Yi Wang, Yongtu Liang, Haoran Zhang
Summary: Due to resource depletion and tightening carbon emissions policies, there is a gradual substitution of petroleum products with biofuels, resulting in falling demand. While many studies have focused on optimizing the biofuel supply chain, few of them have considered existing petroleum pipelines for policy reasons. This paper presents a logistics optimization model that takes into account multi-product pipeline scheduling from the perspective of biofuel suppliers and proposes a pipe-rail transportation mode to assess the potential optimization of logistics costs. A case study conducted in a region of China verifies the feasibility of the proposed approach and concludes that changes in demand for product oil and biofuels have no effect on the choice of pipeline opening location within certain ranges.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Energy & Fuels
Kaituo Jiao, Peng Wang, Yi Wang, Bo Yu, Bofeng Bai, Qianqian Shao, Xinran Wang
Summary: A multi-objective optimization model for natural gas pipeline networks is proposed in this study, considering both reliability and operating cost. The reliability of the pipeline network is calculated using the minimum cut set method. By controlling the compressor speed and valve openings, an optimal operation scheme that satisfies both reliability and operating cost can be achieved.
OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
(2021)
Article
Engineering, Multidisciplinary
Yi Wang, Mohan Lin
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2020)
