Open Access
ARTICLE
Rachid Maouedj1, Younes Menni2, Mustafa Inc3,4,*, Yu-Ming Chu5,6,*, Houari Ameur7, Giulio Lorenzini8
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 855-889, 2021, DOI:10.32604/cmes.2021.014524
Abstract Re-engineering the channel heat exchangers (CHEs) is the goal of many recent studies, due to their great importance in the scope of energy transport in various industrial and environmental fields. Changing the internal geometry of the CHEs by using extended surfaces, i.e., VGs (vortex generators), is the most common technique to enhance the efficiency of heat exchangers. This work aims to develop a new design of solar collectors to improve the overall energy efficiency. The study presents a new channel design by introducing VGs. The FVM (finite volume method) was adopted as a numerical technique to solve the problem, with… More >
Open Access
ARTICLE
Daobing Wang1, Fang Shi2,*, Hao Qin1,*, Dongliang Sun1, Bo Yu1
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 891-914, 2021, DOI:10.32604/cmes.2021.014206
Abstract In this study, we use the extended finite element method (XFEM) with a consideration of junction enrichment
functions to investigate the mechanics of hydraulic fractures related to naturally cemented fractures. In the
proposed numerical model, the lubrication equation is adopted to describe the fluid flow within fractures. The
fluid-solid coupling systems of the hydraulic fracturing problem are solved using the Newton-Raphson method.
The energy release rate criterion is used to determine the cross/arrest behavior between a hydraulic fracture (HF)
and a cemented natural fracture (NF). The failure patterns and mechanisms of crack propagation at the intersection
of natural fractures are… More >
Open Access
ARTICLE
Jurica Sorić*, Tomislav Lesičar, Zdenko Tonković
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 915-934, 2021, DOI:10.32604/cmes.2021.014142
Abstract The paper deals with the numerical modelling of ductile damage responses in heterogeneous materials using the classical second-order homogenization approach. The scale transition methodology in the multiscale framework is described. The structure at the macrolevel is discretized by the triangular C1 finite elements obeying nonlocal continuum theory, while the discretization of microstructural volume element at the microscale is conducted by means of the mixed type quadrilateral finite element with the nonlocal equivalent plastic strain as an additional nodal variable. The ductile damage evolution at the microlevel is modelled by using the gradient enhanced elastoplasticity. The macrolevel softening is governed by… More >
Open Access
ARTICLE
Jinguang Yang, Feng Zhao, Min Zhang*, Yan Liu, Xiaofang Wang
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 935-953, 2021, DOI:10.32604/cmes.2021.014176
Abstract For a radial inflow turbine (RIT), leakage flow in impeller backface cavity has critical impacts on aerodynamic performance of the RIT and axial force acting on the RIT impeller. In order to control this leakage flow, different types of labyrinth seals are numerically studied in this paper based on a supercritical carbon dioxide (S-CO2) RIT. The effects of seal clearance and cavity outlet pressure are first analyzed, and the impacts of seal design parameters, including height, number and shape of seal teeth, are evaluated. Results indicate that adding labyrinth seal can improve cavity pressure and hence adequately inhibits leakage flow.… More >
Open Access
ARTICLE
W. M. Abd-Elhameed1,2,*, Asmaa M. Alkenedri2
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 955-989, 2021, DOI:10.32604/cmes.2021.013603
Abstract This paper is dedicated to implementing and presenting numerical algorithms for solving some linear and nonlinear even-order two-point boundary value problems. For this purpose, we establish new explicit formulas for
the high-order derivatives of certain two classes of Jacobi polynomials in terms of their corresponding Jacobi
polynomials. These two classes generalize the two celebrated non-symmetric classes of polynomials, namely,
Chebyshev polynomials of third- and fourth-kinds. The idea of the derivation of such formulas is essentially based
on making use of the power series representations and inversion formulas of these classes of polynomials. The
derived formulas serve in converting the even-order… More >
Open Access
ARTICLE
Sunil Kr. Jha1,*, Ivan Uzunov2, Xiaorui Zhang1
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 991-1009, 2021, DOI:10.32604/cmes.2021.011821
Abstract Ohrid trout (Salamo letnica) is an endemic species of fish found in Lake Ohrid in the Former Yugoslav Republic
of Macedonia (FYROM). The growth of Ohrid trout was examined in a controlled environment for a certain
period, thereafter released into the lake to grow their natural population. The external features of the fish were
measured regularly during the cultivation period in the laboratory to monitor their growth. The data mining
methods-based computational model can be used for fast, accurate, reliable, automatic, and improved growth
monitoring procedures and classification of Ohrid trout. With this motivation, a combined approach of principal
component… More >
Open Access
ARTICLE
Jiahao Li, Guolai Yang*, Quanzhao Sun
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 1011-1031, 2021, DOI:10.32604/cmes.2021.013982
Abstract In this paper, the subdomain analysis model of the eddy current brake (ECB) is established. By comparing with the finite element method, the accuracies of the subdomain model and the finite element model are verified. Furthermore, the resistance characteristics of radial, axial, and Halbach arrays under impact load are calculated and compared. The axial array has a large braking force coefficient but low critical velocity. The radial array has a low braking force coefficient but high critical velocity. The Halbach array has the advantages of the first two arrays. Not only the braking force coefficient is large, but also the… More >
Open Access
ARTICLE
Houlin Yang1, Bingquan Zuo1,2,*, Zhipeng Wei1,2, Huixin Luo1,2, Jianguo Fei1,2
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 1033-1052, 2021, DOI:10.32604/cmes.2021.014493
Abstract The isogeometric analysis method (IGA) is a new type of numerical method solving partial differential equations. Compared with the traditional finite element method, IGA based on geometric spline can keep the model consistency between geometry and analysis, and provide higher precision with less freedom. However, huge stiffness matrix from the subdivision progress still leads to the solution efficiency problems. This paper presents a multigrid method based on geometric multigrid (GMG) to solve the matrix system of IGA. This method extracts the required computational data for multigrid method from the IGA process, which also can be used to improve the traditional… More >
Open Access
ARTICLE
Yonghua Huo1, Yi Cao2, Zhihao Wang1, Yu Yan3, Zhongdi Ge3, Yang Yang3,*
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 1053-1091, 2021, DOI:10.32604/cmes.2021.013045
Abstract In recent years, with the continuous development of information technology and the rapid growth of network scale, network monitoring and management become more and more important. Network traffic is an important part of network state. In order to ensure the normal operation of the network, improve the availability of the network, find network faults in time and deal with network attacks; it is necessary to detect the abnormal traffic in the network. Abnormal traffic detection is of great significance in the actual network management. Therefore, in order to improve the accuracy and efficiency of network traffic anomaly detection, this paper… More >
Open Access
ARTICLE
Yezhi Qin, Ying Wang, Zhikai Wang*, Xiongliang Yao
CMES-Computer Modeling in Engineering & Sciences, Vol.126, No.3, pp. 1093-1123, 2021, DOI:10.32604/cmes.2021.012969
（This article belongs to this Special Issue: Soft Computing Techniques in Materials Science and Engineering)
Abstract The shock wave of the underwater explosion can cause severe damage to the ship structure. The propagation characteristics of shock waves near the structure surface are complex, involving lots of complex phenomena such as reflection, transmission, diffraction, and cavitation. However, different structure surface boundaries have a significant effect on the propagation characteristics of pressure. This paper focuses on investigating the behavior of shock wave propagation and cavitation from underwater explosions near various structure surfaces. A coupled Runge–Kutta discontinuous Galerkin (RKDG) and finite element method (FEM) is utilized to solve the problem of the complex waves of fluids and structure dynamic… More >
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