Open Access
ARTICLE
Thanh Tien Bui1,*, Yoshihisa Fujita2, Susumu Nakata2
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 425-442, 2021, DOI:10.32604/cmes.2021.016766
Abstract In this paper, we propose a simplified approach of open boundary conditions for particle-based fluid simulations using the weakly compressible smoothed-particle hydrodynamics (SPH) method. In this scheme, the values of the inflow/outflow particles are calculated as fluid particles or imposed desired values to ensure the appropriate evolution of the flow field instead of using a renormalization process involving the fluid particles. We concentrate on handling the generation of new inflow particles using several simple approaches that contribute to the flow field stability. The advantages of the . -SPH scheme, specifically the particle shifting technique, were successfully applied to correct the… More >
Open Access
ARTICLE
N. Ganesh1, Uvaraja Ragavendran2, Kanak Kalita3,*, Paras Jain4, Xiao-Zhi Gao5
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 443-464, 2021, DOI:10.32604/cmes.2021.014960
Abstract Optimizing the performance of composite structures is a real-world application with significant benefits. In this
paper, a high-fidelity finite element method (FEM) is combined with the iterative improvement capability of
metaheuristic optimization algorithms to obtain optimized composite plates. The FEM module comprises of ninenode isoparametric plate bending element in conjunction with the first-order shear deformation theory (FSDT).
A recently proposed memetic version of particle swarm optimization called RPSOLC is modified in the current
research to carry out multi-objective Pareto optimization. The performance of the MO-RPSOLC is found to be
comparable with the NSGA-III. This work successfully highlights the use of… More >
Open Access
ARTICLE
Liang Mu, Hong Zhao*, Yan Li, Xiaotong Liu, Junzheng Qiu, Chuanlong Sun
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 465-483, 2021, DOI:10.32604/cmes.2021.017276
（This article belongs to this Special Issue: Modeling and Analysis of Autonomous Intelligence)
Abstract Traffic flow statistics have become a particularly important part of intelligent transportation. To solve the problems of low real-time robustness and accuracy in traffic flow statistics. In the DeepSort tracking algorithm, the Kalman filter (KF), which is only suitable for linear problems, is replaced by the extended Kalman filter (EKF), which can effectively solve nonlinear problems and integrate the Histogram of Oriented Gradient (HOG) of the target. The multi-target tracking framework was constructed with YOLO V5 target detection algorithm. An efficient and long-running Traffic Flow Statistical framework (TFSF) is established based on the tracking framework. Virtual lines are set up… More >
Open Access
ARTICLE
Zhongxue Li1,*, Jiawei Ji1, Loc Vu-Quoc2, Bassam A. Izzuddin3, Xin Zhuo1
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 485-518, 2021, DOI:10.32604/cmes.2021.016050
（This article belongs to this Special Issue: Progress in Finite Element Methods Using Advanced Plate/Shell and Beam Theories)
Abstract Based on the first-order shear deformation theory, a 3-node co-rotational triangular finite element formulation is developed for large deformation modeling of non-smooth, folded and multi-shell laminated composite structures. The two smaller components of the mid-surface normal vector of shell at a node are defined as nodal rotational variables in the co-rotational local coordinate system. In the global coordinate system, two smaller components of one vector, together with the smallest or second smallest component of another vector, of an orthogonal triad at a node on a non-smooth intersection of plates and/or shells are defined as rotational variables, whereas the two smaller… More >
Open Access
ARTICLE
Jingjing Zhao1,*, Guangda Lu2, Qing Zhang3, Wenchao Du4
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 519-539, 2021, DOI:10.32604/cmes.2021.017268
Abstract As a typical brittle material, glass is widely used in construction, transportation, shipbuilding, aviation, aerospace and other industries. The unsafe factors of glass mainly come from its rupture. Thus, establishing a set of prediction models for the cracks growth of glass under dynamic load is necessary. This paper presents a contact damage model for glass based on the ordinary state-based peridynamic theory by introducing a contact force function. The Hertz contact (nonembedded contact) problem is simulated, and the elastic contact force is determined by adjusting the penalty factor. The proposed model verifies the feasibility of penalty-based method to simulate the… More >
Open Access
ARTICLE
Juan Ramón Bermejo Higuera1, Javier Bermejo Higuera1, Juan Antonio Sicilia Montalvo1, Tomás Sureda Riera2, Christopher I. Argyros3, Á. Alberto Magreñán4,*
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 541-565, 2021, DOI:10.32604/cmes.2021.017213
Abstract Security weaknesses in web applications deployed in cloud architectures can seriously affect its data confidentiality and integrity. The construction of the procedure utilized in the static analysis tools of source code security differs and therefore each tool finds a different number of each weakness type for which it is designed. To utilize the possible synergies different static analysis tools may process, this work uses a new method to combine several source codes aiming to investigate how to increase the performance of security weakness detection while reducing the number of false positives. Specifically, five static analysis tools will be combined with… More >
Open Access
ARTICLE
Sunil Kr. Jha1,*, Zulfiqar Ahmad2
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 567-594, 2021, DOI:10.32604/cmes.2021.016817
Abstract Health care data mining is noteworthy in disease diagnosis and recognition procedures. There exist several
potentials to further improve the performance of machine learning based-classification methods in healthcare data
analysis. The selection of a substantial subset of features is one of the feasible approaches to achieve improved
recognition results of classification methods in disease diagnosis prediction. In the present study, a novel combined
approach of feature generation using latent semantic analysis (LSA) and selection using ranker search (RAS) has
been proposed to improve the performance of classification methods in lymph disease diagnosis prediction. The
performance of the proposed combined approach… More >
Open Access
ARTICLE
Wei Wang1,2, Yanfeng Zheng1,3, Jingzhe Tang1, Chao Yang1, Yaozhi Luo1,*
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 595-626, 2021, DOI:10.32604/cmes.2021.017321
Abstract Large deformation contact problems generally involve highly nonlinear behaviors, which are very time-consuming and may lead to convergence issues. The finite particle method (FPM) effectively separates pure deformation from total motion in large deformation problems. In addition, the decoupled procedures of the FPM make it suitable for parallel computing, which may provide an approach to solve time-consuming issues. In this study, a graphics processing unit (GPU)-based parallel algorithm is proposed for two-dimensional large deformation contact problems. The fundamentals of the FPM for planar solids are first briefly introduced, including the equations of motion of particles and the internal forces of… More >
Open Access
ARTICLE
Chao Mei1,2, Qifu Wang1,*, Chen Yu1, Zhaohui Xia1
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 627-659, 2021, DOI:10.32604/cmes.2021.017704
（This article belongs to this Special Issue: Novel Methods of Topology Optimization and Engineering Applications)
Abstract This paper presents an effective fiber angle optimization method for two and multi-layered variable stiffness composites. A gradient-based fiber angle optimization method is developed based on isogeometric analysis (IGA). Firstly, the element densities and fiber angles for two and multi-layered composites are synchronously optimized using an extended Bi-layered continuous fiber angle optimization method (XBi-CFAO). The densities and fiber angles in the base layer are attached to the control points. The structure response and sensitivity analysis are accomplished using the non-uniform rational B-spline (NURBS) based IGA. By the benefit of the B-spline space, this method is free from checkerboards, and no… More >
Open Access
ARTICLE
Jiazheng Du*, Ying Zhang, Fanwei Meng
CMES-Computer Modeling in Engineering & Sciences, Vol.129, No.2, pp. 661-687, 2021, DOI:10.32604/cmes.2021.017580
（This article belongs to this Special Issue: Novel Methods of Topology Optimization and Engineering Applications)
Abstract Traditional topology optimization methods may lead to a great reduction in the redundancy of the optimized structure due to unexpected material removal at the critical components. The local failure in critical components can instantly cause the overall failure in the structure. More and more scholars have taken the fail-safe design into consideration when conducting topology optimization. A lot of good designs have been obtained in their research, though limited regarding minimizing structural compliance (maximizing stiffness) with given amount of material. In terms of practical engineering applications considering fail-safe design, it is more meaningful to seek for the lightweight structure with… More >
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