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  • Open Access

    PROCEEDINGS

    Multiscale Modelling of Normal Fault Rupture-Soil-Foundation Interaction

    Lifan Chen1,*, Ning Guo1, Zhongxuan Yang1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.27, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09709

    Abstract A multiscale approach [1] that couples the finite-element method (FEM) and the discrete-element method (DEM) is employed to model and analyse the earthquake fault rupture-soil-foundation interaction (FR-SFI) problem. In the approach, the soil constitutive responses are obtained from DEM solutions of representative volume elements (RVEs) embedded at the FEM integration points so as to effectively bypass the phenomenological hypotheses in conventional FEM simulations. The fault rupture surfaces and shear localization patterns under normal faults with or without foundation atop have been well captured by the multiscale approach and verified with available centrifuge experimental [2] and More >

  • Open Access

    PROCEEDINGS

    A Double-Phase-Field Model for the Cohesive Failure Modelling in Laminated Composite Materials

    Haibo Su1, Liang Wang1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.26, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09611

    Abstract This work presents a novel double-phase-field formulation to characterize the distinct damage mechanisms and the mixed-mode cohesive fracture behaviors in fiber-reinforced composites (FRC). A hybrid phase field formulation is first proposed to derive the phase field and stress through distinct energy functionals. Then, the phase field degradation function and material damaged stiffness are properly defined based on the unique failure mechanisms, which enable the derivation of the embedded Hashin failure criteria for fiber and matrix failures in FRC respectively. Furthermore, the mixed-model cohesive law with linear softening is analytically derived within the phase field framework More >

  • Open Access

    PROCEEDINGS

    Recent Progresses of Shallow Water Hydro-sediment-morphodynamic Modelling: Improvement of Computational Efficiencies and Typical Applications

    Peng Hu1,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.25, No.2, pp. 1-1, 2023, DOI:10.32604/icces.2023.09880

    Abstract Shallow water hydro-sediment-morphodynamic modelling plays significant role in several aspects (e.g., river and estuarine engineering). In response to climate change and intense human activities, there have been dramatic changes in river water and sediment flux conditions, and thus sediment transport intensity and bed morphological evolution differs from traditional characteristics. These necessitates fully coupled shallow water hydro-sediment-morphodynamic modelling, which however may damage the computational efficiency. Here we report some progresses in developing a computationally efficient version of fully coupled shallow water hydro-sediment-morphodynamic model and its preliminary applications in bottle-neck navigational waterways of the Yangtze river. More >

  • Open Access

    ARTICLE

    Airfoil Shape Optimisation Using a Multi-Fidelity Surrogate-Assisted Metaheuristic with a New Multi-Objective Infill Sampling Technique

    Cho Mar Aye1, Kittinan Wansaseub2, Sumit Kumar3, Ghanshyam G. Tejani4, Sujin Bureerat1, Ali R. Yildiz5, Nantiwat Pholdee1,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.137, No.3, pp. 2111-2128, 2023, DOI:10.32604/cmes.2023.028632

    Abstract This work presents multi-fidelity multi-objective infill-sampling surrogate-assisted optimization for airfoil shape optimization. The optimization problem is posed to maximize the lift and drag coefficient ratio subject to airfoil geometry constraints. Computational Fluid Dynamic (CFD) and XFoil tools are used for high and low-fidelity simulations of the airfoil to find the real objective function value. A special multi-objective sub-optimization problem is proposed for multiple points infill sampling exploration to improve the surrogate model constructed. To validate and further assess the proposed methods, a conventional surrogate-assisted optimization method and an infill sampling surrogate-assisted optimization criterion are applied More > Graphic Abstract

    Airfoil Shape Optimisation Using a Multi-Fidelity Surrogate-Assisted Metaheuristic with a New Multi-Objective Infill Sampling Technique

  • Open Access

    ARTICLE

    Computer Modelling of Compact 28/38 GHz Dual-Band Antenna for Millimeter-Wave 5G Applications

    Amit V. Patel1, Arpan Desai1, Issa Elfergani2,3,*, Hiren Mewada4, Chemseddine Zebiri5, Keyur Mahant1, Jonathan Rodriguez2, Raed Abd-Alhameed3

    CMES-Computer Modeling in Engineering & Sciences, Vol.137, No.3, pp. 2867-2879, 2023, DOI:10.32604/cmes.2023.026200

    Abstract A four-element compact dual-band patch antenna having a common ground plane operating at 28/38 GHz is proposed for millimeter-wave communication systems in this paper. The multiple-input-multiple-output (MIMO) antenna geometry consists of a slotted ellipse enclosed within a hollow circle which is orthogonally rotated with a connected partial ground at the back. The overall size of the four elements MIMO antenna is 2.24λ × 2.24λ (at 27.12 GHz). The prototype of four-element MIMO resonator is designed and printed using Rogers RT Duroid 5880 with εr = 2.2 and loss tangent = 0.0009 and having a thickness of More >

  • Open Access

    ARTICLE

    Modelling an Efficient URL Phishing Detection Approach Based on a Dense Network Model

    A. Aldo Tenis*, R. Santhosh

    Computer Systems Science and Engineering, Vol.47, No.2, pp. 2625-2641, 2023, DOI:10.32604/csse.2023.036626

    Abstract The social engineering cyber-attack is where culprits mislead the users by getting the login details which provides the information to the evil server called phishing. The deep learning approaches and the machine learning are compared in the proposed system for presenting the methodology that can detect phishing websites via Uniform Resource Locator (URLs) analysis. The legal class is composed of the home pages with no inclusion of login forms in most of the present modern solutions, which deals with the detection of phishing. Contrarily, the URLs in both classes from the login page due, considering… More >

  • Open Access

    ARTICLE

    MATHEMATICAL MODELLING OF UNSTEADY MHD DOUBLEDIFFUSIVE NATURAL CONVECTION FLOW IN A SQUARE CAVITY

    K. Venkatadria,*, S. Gouse Mohiddina , M. Suryanarayana Reddyb

    Frontiers in Heat and Mass Transfer, Vol.9, pp. 1-9, 2017, DOI:10.5098/hmt.9.33

    Abstract Two-dimensional unsteady laminar double-diffusive free convective flow of a conducting fluid in a thermally insulated square enclosure except the left wall has been numerically studied in presence of heat generation/absorption. The Marker and Cell (MAC) method is employed for solving nonlinear momentum, energy and concentration equations and the numerical MATLAB code is validated with the previous study. The computed results are depicted graphically and discussed for various values of Rayleigh number (Ra), Hartmann number (Ha), Buoyancy ratio parameter (N), Lewis number (Le) and heat absorption/generation parameter (γ). It is observed that the rate of heat More >

  • Open Access

    ARTICLE

    STEADY-STATE TRANSPORT PHENOMENA ON INDUCED MAGNETIC FIELD MODELLING FOR NON-NEWTONIAN TANGENT HYPERBOLIC FLUID FROM AN ISOTHERMAL SPHERE WITH SORET AND DUFOUR EFFECTS

    A. Subba Raoa,*, L. Nagarajaa,b, M. Sudhakar Reddya , M. Surya Narayana Reddyb

    Frontiers in Heat and Mass Transfer, Vol.9, pp. 1-11, 2017, DOI:10.5098/hmt.9.17

    Abstract This article investigates the theoretical steady magneto hydrodynamic heat flow of incompressible non-Newtonian Tangent Hyperbolic fluid flow over a sphere with Soret and Dufour effects. The governing coupled non-linear partial differential equations are reduced to non-similarity boundary layer equations using appropriate transformation and then solved using the finite difference Keller-Box method. The effect of various flow parameters on the velocity, temperature and concentration are analyzed and presented graphically. More >

  • Open Access

    ARTICLE

    Effect of Fibre Size on Mechanical Properties and Surface Roughness of PLA Composites by Using Fused Deposition Modelling (FDM)

    Aida Haryati Jamadi1, Nadlene Razali1,3,*, Sivakumar Dhar Malingam1,3, Mastura Mohammad Taha2,3

    Journal of Renewable Materials, Vol.11, No.8, pp. 3261-3276, 2023, DOI:10.32604/jrm.2023.028280

    Abstract Natural fibre as a reinforcing agent has been widely used in many industrial applications. Nevertheless, several factors need to be considered, such as the size and weight percentage of the fibre used in binding. Using fused deposition modelling (FDM), this factor was investigated by varying the size of natural fibre as the responding variable with a fixed weight percentage of kenaf fibre. The process of modifying the natural fibre in terms of size might increase the dispersion of kenaf fibre in the polymer matrix and increase the adhesion bonding between the fibre and matrix of… More >

  • Open Access

    ARTICLE

    TRANSIENT MODELLING OF AN EV INVERTER HEAT SINK WITH PCM

    B. Orra,* , R. Singha, T. L. Phana , M. Mochizukib

    Frontiers in Heat and Mass Transfer, Vol.13, pp. 1-6, 2019, DOI:10.5098/hmt.13.1

    Abstract One of the problems with cooling an IGBT inverter chip is that its heat generation is not constant. These chips tend to produce heat in pulses which results in high peak chip temperatures. Transient modelling is required to determine the suitability of a heat sink and to ensure the max peak temperature is not exceeded. This paper demonstrates a method of transient thermal analysis using a thermal resistance / capacitor network. A sample heat sink was modelled and then experimentally tested to validate the model. A novel method of modelling phase change materials (PCM) using More >

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