In the article, Huinan Sun and her co-workers from COFCO Research & Engineering (Zhengzhou) Co., Ltd. and Dalian University of Technology investigated the flow characteristics of granular materials in a silo with a central decompression tube using experiments and discrete element methods. A silo with a central decompression tube is more conducive to grain storage and discharge than a silo without a central decompression tube.
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Ellie Vineyard1, Xin-Lin Gao2,*
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 819-854, 2021, DOI:10.32604/cmes.2021.015688
Abstract 2-D and 3-D micro-architectured multiphase thermoelastic metamaterials are designed and analyzed using a parametric level set method for topology optimization and the finite element method. An asymptotic homogenization approach is employed to obtain the effective thermoelastic properties of the multiphase metamaterials. The -constraint multi-objective optimization method is adopted in the formulation. The coefficient of thermal expansion (CTE) and Poisson’s ratio (PR) are chosen as two objective functions, with the CTE optimized and the PR treated as a constraint. The optimization problems are solved by using the method of moving asymptotes. Effective isotropic and anisotropic CTEs and stiffness constants are obtained… More >
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Huinan Sun1,*, Siqiang Wang2, Zhuoqing Zhang1, Chaoyong Xia1, Xu Chen1
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 855-873, 2021, DOI:10.32604/cmes.2021.015791
（This article belongs to this Special Issue: Computational Mechanics of Granular Materials and its Engineering Applications)
Abstract Grains are widely present in industrial productions and processing, and are stored in silos. In the silo, auxiliary
structures are added to achieve efficient production. However, little effort has been devoted to the influence of
the internal structure of the silo on the granular flow. In this work, a silo with a central decompression tube is
studied through experimental measurements and discrete element methods. Then, the influences of the central
decompression tube on the flow behavior of grains and wall pressure are analyzed. Results show that the grains are
in mass flow in the silo without a central decompression tube,… More >
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ARTICLE
Ali. F. Jameel1,*, N. R. Anakira2, A. K. Alomari3, Noraziah H. Man1
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 875-899, 2021, DOI:10.32604/cmes.2021.014460
Abstract Homotopy Analysis Method (HAM) is semi-analytic method to solve the linear and nonlinear mathematical
models which can be used to obtain the approximate solution. The HAM includes an auxiliary parameter, which
is an efficient way to examine and analyze the accuracy of linear and nonlinear problems. The main aim of this
work is to explore the approximate solutions of fuzzy Volterra integral equations (both linear and nonlinear) with
a separable kernel via HAM. This method provides a reliable way to ensure the convergence of the approximation
series. A new general form of HAM is presented and analyzed in the fuzzy… More >
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ARTICLE
Safia Akram*, Alia Razia
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 901-922, 2021, DOI:10.32604/cmes.2021.014469
Abstract This article brings into focus the hybrid effects of thermal and concentration convection on peristaltic pumping of fourth grade nanofluids in an inclined tapered channel. First, the brief mathematical modelling of the fourth grade nanofluids is provided along with thermal and concentration convection. The Lubrication method is used to simplify the partial differential equations which are tremendously nonlinear. Further, analytical technique is applied to solve the differential equations that are strongly nonlinear in nature, and exact solutions of temperature, volume fraction of nanoparticles, and concentration are studied. Numerical and graphical findings manifest the influence of various physical flow-quantity parameters. It… More >
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ARTICLE
Ming He, Yunlong Liu*, Shaofei Ren, Wentao Liu
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 923-942, 2021, DOI:10.32604/cmes.2021.015259
Abstract The fluid-structure interaction of the oscillating bubble and floating body with circular hole is essentially the nonlinear coupling problem among the incomplete movable boundary, free surface and bubble. This problem is particularly complicated in bubble dynamics. Combined with the volume of fluid method, the Eulerian finite element method is employed to deal with the fluid movement. Based on the improved penalty immersed boundary method, the transient axisymmetric numerical model is established in this paper, considering the fluid-structure interaction effect. The results of simulation are consistent with those of the electric discharge bubble experiment and explosion experiment. Subsequently, considering the influence… More >
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ARTICLE
Heonmoo Kim, Yosoon Choi*
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 943-964, 2021, DOI:10.32604/cmes.2021.015300
Abstract In underground mine environments where various hazards exist, such as tunnel collapse, toxic gases, the application of autonomous robots can improve the stability of exploration and efficiently perform repetitive exploratory
operations. In this study, we developed a small autonomous driving robot for unmanned environmental monitoring
in underground mines. The developed autonomous driving robot controls the steering according to the distance
to the tunnel wall measured using the light detection and ranging sensor mounted on the robot to estimate its
location by simultaneously considering the measured values of the inertial measurement unit and encoder sensors.
In addition, the robot autonomously drives… More >
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ARTICLE
Juyoung Park1,*, Jung Hee Lee1, Junseong Bang2,3
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 965-976, 2021, DOI:10.32604/cmes.2021.014669
（This article belongs to this Special Issue: HPC with Artificial Intelligence based Deep Video Data Analytics: Models, Applications and Approaches)
Abstract
We propose a mobile system, called PotholeEye+, for automatically monitoring the surface of a roadway and detecting the pavement distress in real-time through analysis of a video. PotholeEye+ pre-processes the images, extracts features, and classifies the distress into a variety of types, while the road manager is driving. Every day for a year, we have tested PotholeEye+ on real highway involving real settings, a camera, a mini computer, a GPS receiver, and so on. Consequently, PotholeEye+ detected the pavement distress with accuracy of 92%, precision of 87% and recall 74% averagely during driving at an average speed of 110 km/h… More >
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ARTICLE
Danhe Chen1,*, A. A. Baranov2, Chuangge Wang1, M. O. Karatunov3, N. Yu. Makarov3
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 977-991, 2021, DOI:10.32604/cmes.2021.014662
（This article belongs to this Special Issue: Modeling and Analysis of Autonomous Intelligence)
Abstract As the number of space objects (SO) increases, collision avoidance problem in the rendezvous tasks or re-constellation of satellites with SO has been paid more attention, and the dangerous area of a possible collision should be derived. In this paper, a maneuvering method is proposed for avoiding collision with a space debris object in the phasing orbit of the initial optimal solution. Accordingly, based on the plane of eccentricity vector components, relevant dangerous area which is bounded by two parallel lines is formulated. The axises of eccentricity vector system pass through the end of eccentricity vector of phasing orbit in… More >
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ARTICLE
Chao-Feng Shih1, Yung-Wei Chen1,3,*, Jiang-Ren Chang2, Shih-Ping Soon1
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 993-1012, 2021, DOI:10.32604/cmes.2021.012702
（This article belongs to this Special Issue: Modeling Real World Problems with Mathematics)
Abstract
In this paper, the equal-norm multiple-scale Trefftz method combined with the implicit Lie-group scheme is applied to solve the two-dimensional nonlinear sloshing problem with baffles. When considering solving sloshing problems with baffles by using boundary integral methods, degenerate geometry and problems of numerical instability are inevitable. To avoid numerical instability, the multiple-scale characteristic lengths are introduced into T-complete basis functions to efficiently govern the high-order oscillation disturbance. Again, the numerical noise propagation at each time step is eliminated by the vector regularization method and the group-preserving scheme. A weighting factor of the group-preserving scheme is introduced into a linear system… More >
Open Access
ARTICLE
P. Veeresha1, Esin Ilhan2, D. G. Prakasha3, Haci Mehmet Baskonus4, Wei Gao5,*
CMES-Computer Modeling in Engineering & Sciences, Vol.127, No.3, pp. 1013-1036, 2021, DOI:10.32604/cmes.2021.014988
（This article belongs to this Special Issue: Mathematical Aspects of Computational Biology and Bioinformatics)
Abstract In this paper, we analyze the behaviour of solution for the system exemplifying model of tumour invasion and
metastasis by the help of q-homotopy analysis transform method (q-HATM) with the fractional operator. The
analyzed model consists of a system of three nonlinear differential equations elucidating the activation and the
migratory response of the degradation of the matrix, tumour cells and production of degradative enzymes by
the tumour cells. The considered method is graceful amalgamations of q-homotopy analysis technique with Laplace
transform (LT), and Caputo–Fabrizio (CF) fractional operator is hired in the present study. By using the fixed point
theory, existence… More >
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