Home / Journals / CMES / Vol.122, No.3, 2020
Table of Content
  • Open AccessOpen Access

    ARTICLE

    Real-Time Thermomechanical Modeling of PV Cell Fabrication via a POD-Trained RBF Interpolation Network

    Arka Das1, Anthony Khoury1, Eduardo Divo1, *, Victor Huayamave1, Andres Ceballos2, Ron Eaglin2, Alain Kassab3, Adam Payne4, Vijay Yelundur4, Hubert Seigneur5
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 757-777, 2020, DOI:10.32604/cmes.2020.08164
    Abstract This paper presents a numerical reduced order model framework to simulate the physics of the thermomechanical processes that occur during c-Si photovoltaic (PV) cell fabrication. A response surface based on a radial basis function (RBF) interpolation network trained by a Proper Orthogonal Decomposition (POD) of the solution fields is developed for fast and accurate approximations of thermal loading conditions on PV cells during the fabrication processes. The outcome is a stand-alone computational tool that provides, in real time, the quantitative and qualitative thermomechanical response as a function of user-controlled input parameters for fabrication processes with the precision of 3D finite… More >

  • Open AccessOpen Access

    ARTICLE

    Multiscale Isogeometric Topology Optimization with Unified Structural Skeleton

    Chen Yu1, Qifu Wang1, ∗, Chao Mei1, Zhaohui Xia1
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 779-803, 2020, DOI:10.32604/cmes.2020.09363
    (This article belongs to this Special Issue: Recent Developments of Isogeometric Analysis and its Applications in Structural Optimization)
    Abstract This paper proposes a multiscale isogeometric topology optimization (ITO) method where the configuration and layout of microstructures are optimized simultaneously. At micro scale, a shape deformation method is presented to transform a prototype microstructure (PM) for obtaining a series of graded microstructures (GMs), where microstructural skeleton based on the level set framework is applied to retain more topology features and improve the connectability. For the macro scale calculation, the effective mechanical properties can be estimated by means of the numerical homogenization method. By adopting identical non-uniform rational basis splines (NURBS) as basis functions for both parameterized level set model and… More >

  • Open AccessOpen Access

    ARTICLE

    Numerical Analysis on Multi-Field Characteristics and Synergy in a Large-Size Annular Combustion Chamber with Double Swirlers

    Zaiguo Fu1, *, Huanhuan Gao1, Zhuoxiong Zeng1, Jiang Liu1
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 805-830, 2020, DOI:10.32604/cmes.2020.08825
    (This article belongs to this Special Issue: Advances in Modeling and Simulation of Complex Heat Transfer and Fluid Flow)
    Abstract In order to comprehensively evaluate the flow and heat transfer performance of a large-size annular combustion chamber of a heavy-duty gas turbine, we carried out numerical computation and analyses on the velocity, temperature and pressure fields in the chamber with double swirlers. The mathematical model of the coupling combustion, gas flow, and heat transfer process was established. The influences of the inlet swirling strength, fuel-air ratio and temperature of the premixed gas on the multi-field characteristics and synergy were investigated on the basis of field synergy theory. The results showed that the central recirculation zone induced by the inlet swirling… More >

  • Open AccessOpen Access

    ARTICLE

    Application of Smooth Particle Hydrodynamics Method for Modelling Blood Flow with Thrombus Formation

    M. Al-Saad1, C. A. Suarez2, 4, A. Obeidat2, S. P. A. Bordas1, 2, 3, *, S. Kulasegaram1
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 831-862, 2020, DOI:10.32604/cmes.2020.08527
    Abstract Thrombosis plays a crucial role in atherosclerosis or in haemostasis when a blood vessel is injured. This article focuses on using a meshless particle-based Lagrangian numerical technique, the smoothed particles hydrodynamic (SPH) method, to study the flow behaviour of blood and to explore the flow parameters that induce formation of a thrombus in a blood vessel. Due to its simplicity and effectiveness, the SPH method is employed here to simulate the process of thrombogenesis and to study the effect of various blood flow parameters. In the present SPH simulation, blood is modelled by two sets of particles that have the… More >

  • Open AccessOpen Access

    ARTICLE

    Implementation of PSOANN Optimized PI Control Algorithm for Shunt Active Filter

    M. Sujith1, *, S. Padma2
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 863-888, 2020, DOI:10.32604/cmes.2020.08908
    Abstract This paper proposes the optimum controller for shunt active filter (SAF) to mitigate the harmonics and maintain the power quality in the distribution system. It consists of shunt active filter, Voltage Source Inverter (VSI), series inductor and DC bus and nonlinear load. The proposed hybrid approach is a combination of Particle Swarm Optimization (PSO) and Artificial Neural Network (ANN) termed as PSOANN. The PI controller gain parameters of kp and ki are optimized with the help of PSOANN. The PSOANN improves the accuracy of tuning the gain parameters under steady and dynamic load conditions; thereby it reduces the values of… More >

  • Open AccessOpen Access

    ARTICLE

    Impact Dynamics of a Dragonfly Wing

    Lihua Wang1, *, Wenjing Ye1, Yueting Zhou1
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 889-906, 2020, DOI:10.32604/cmes.2020.09013
    Abstract The lift force was reported not to be high enough to support the dragonfly’s weight during flight in some conventional investigations, and higher lift force is required for its takeoff. In this study, by employing a thin plate model, impact effect is investigated for the wing deformation in dragonfly flapping during takeoff. The static displacement is formulated to compare with the dynamical displacement caused by impact. The governing equation of motion for the impact dynamics of a dragonfly wing is derived based on Newton’s second law. Separation of variables technique and assumed modes method are introduced to solve the resulting… More >

  • Open AccessOpen Access

    ARTICLE

    Stability and Bifurcation Analysis of a Discrete Predator-Prey Model with Mixed Holling Interaction

    M. F. Elettreby1, 2, *, Tamer Nabil1, 3, A. Khawagi4
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 907-921, 2020, DOI:10.32604/cmes.2020.08664
    Abstract In this paper, a discrete Lotka-Volterra predator-prey model is proposed that considers mixed functional responses of Holling types I and III. The equilibrium points of the model are obtained, and their stability is tested. The dynamical behavior of this model is studied according to the change of the control parameters. We find that the complex dynamical behavior extends from a stable state to chaotic attractors. Finally, the analytical results are clarified by some numerical simulations. More >

  • Open AccessOpen Access

    ARTICLE

    On the Simulation of Fragmentation During the Process of Ceramic Tile Impacted by Blunt Projectile with SPH Method in LS-DYNA

    Yihua Xiao1, *, Hecheng Wu1, Xuecheng Ping2, *
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 923-954, 2020, DOI:10.32604/cmes.2020.07686
    Abstract Ceramics are extensively used in protective structures which are often subjected to projectile impacts. During an impact process of a ceramic target by a projectile, fragmentation occurs in both the target and the projectile. It is challenging to simulate such events and predict residual mass and velocity of the projectile. In this work, we attempt to use smoothed particle hydrodynamics (SPH) in LS-DYNA to reproduce fragmentation of the target and the projectile and predict residual mass and velocity of the projectile during a projectile impact of a ceramic target. SPH models for an alumina ceramic tile impacted by a blunt… More >

  • Open AccessOpen Access

    ARTICLE

    A Unified Dimensionless Parameter for Finite Element Mesh for Beams Resting on Elastic Foundation

    Ping Lou1, 2, ∗, Xinlei Zhang1, F. T. K. Au3, Zixian Zhang1, Yi Huang1
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 955-969, 2020, DOI:10.32604/cmes.2020.08302
    Abstract Discretising a structure into elements is a key step in finite element (FE) analysis. The discretised geometry used to formulate an FE model can greatly affect accuracy and validity. This paper presents a unified dimensionless parameter to generate a mesh of cubic FEs for the analysis of very long beams resting on an elastic foundation. A uniform beam resting on elastic foundation with various values of flexural stiffness and elastic supporting coefficients subject to static load and moving load is used to illustrate the application of the proposed parameter. The numerical results show that (a) Even if the values of… More >

  • Open AccessOpen Access

    ARTICLE

    Analysis of Naval Ship Evacuation Using Stochastic Simulation Models and Experimental Data Sets

    Roberto Bellas1, *, Javier Martínez1, Ignacio Rivera2, Ramón Touza2, Miguel Gómez1, Rafael Carreño1
    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 971-995, 2020, DOI:10.32604/cmes.2020.07530
    (This article belongs to this Special Issue: Numerical Modeling and Simulation for Structural Safety and Disaster Mitigation)
    Abstract The study of emergency evacuation in public spaces, buildings and large ships may present parallel characteristic in terms of complexity of the layout but there are also significant differences that can hindering passengers to reach muster stations or the lifeboats. There are many hazards on a ship that can cause an emergency evacuation, the most severe result in loss of lives. Providing safe and effective evacuation of passengers from ships in an emergency situation becomes critical. Recently, computer simulation has become an indispensable technology in various fields, among them, the evacuation models that recently evolved incorporating human behavioral factors. In… More >

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