Home / Journals / ICCES / Vol.22, No.1, 2019
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  • Open Access

    ABSTRACT

    Flow Characteristics of Non-Spherical Particles Simulated with Super-Quadric DEM

    Shunying Ji*, Siqiang Wang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 94-94, 2019, DOI:10.32604/icces.2019.04805
    Abstract Granular flow is commonly encountered in industry or nature, and is significantly affected by particle shapes. Super-quadric particles which can construct the geometric shape of irregular particles are simulated by the Discrete Element Method (DEM). In this study, the influence of aspect ratio and blockiness of particles on the flow characteristics is investigated, and the different discharge angles are used for different shaped particles to show the superposed effect of hopper configuration. Meanwhile, the Lacey mixing index is used to explore the effects of particle shapes on the mixing and motion of the granular system in a horizontal rotating drum.… More >

  • Open Access

    ABSTRACT

    Adaptive Modelling for Multiphase Flow Through Debris Bed With Boiling

    Liang Yang1,*, Andrew Buchan2, Alan Jones1, Paul Smith1, Mikio Sakai3, Christopher Pain1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 95-95, 2019, DOI:10.32604/icces.2019.05077
    Abstract In the event of a severe accident, a large part of the core may collapse and form a debris bed. Debris bed coolability is important to avoid releasing the radioactive materials to the environment. If it is not rapidly cooled, the debris bed will begin to melt and become harder to cool. To stop or slow down the accident evolution, the main approach is to inject water into the reactor core. However, the success of the cooling is not guaranteed depending on the debris bed and the operating condition. This procedure is challenging to understand and model, as it involves… More >

  • Open Access

    ABSTRACT

    A Scaling Approach for CFD-DEM Modelling of Thermochemical Behaviours in Moving Bed Reactors and Its Application

    Qinfu Hou1,*, Dianyu E.1,2, Shibo Kuang1, Aibing Yu1,3
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 96-97, 2019, DOI:10.32604/icces.2019.05438
    Abstract Intensive heat and mass transfer between continuum fluids and discrete particulate materials plays a critical role in many chemical reactors [1]. For example, the shaft furnace and the blast furnace in ironmaking are operated with continuous charge and discharge of solid materials, and it takes hours for the solid materials moving from the furnace top to the bottom. To understand and improve the operation of these reactors, discrete particle models are very helpful when combined with flow, heat and mass transfer, and chemical reaction models [2-6]. However, due to the high computational cost with such discrete particle models, it is… More >

  • Open Access

    ABSTRACT

    Simulation of Wave Induced Ice Brakeup Process Using Dilated Polyhedral Dem

    Ji Li, Shunying Ji*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 98-98, 2019, DOI:10.32604/icces.2019.05491
    Abstract An important issue for MIZ (Marginal Ice Zone) simulation is the correct prediction of ice-wave interaction. The energy of wave will be eliminated and at the same time induces the breakage and fragment of level ice. To study ice failure and the floe-size distribution (FSD) after fracture will help to improve the accuracy of further numerical simulation. We present a three-dimensional DPDEM (Dilated Polyhedral Discrete Element Method) in which element is similar to the real shape of single block to simulate the ice fracture process under the wave load. A large number of polyhedral ice elements generated with Voronoi tessellation… More >

  • Open Access

    ABSTRACT

    Dem Simulation of First-Year Ice Ridge Interactions With Moored Structures

    Hongri Zhu, Shunying Ji *
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 99-99, 2019, DOI:10.32604/icces.2019.05493
    Abstract First-year ice ridges determine the design load of moored structures in many Arctic and sub-Arctic regions. Their interactions with moored structures were simulated with discrete element method (DEM), considering the complex internal structures of ice ridges. In the simulation, ice ridges were modeled as an assembly of consolidated ice blocks randomly packed through a dynamic process. The shapes of ice blocks were generated based on Voronoi tessellation and then filled with bonded sphere elements. The model was calibrated and validated by comparing the numerical results with the punch through experiments and direct shear box experiments data in the literature. Based… More >

  • Open Access

    ABSTRACT

    Discrete Simulation of Particle Separation in Microfluid due to SSAW

    Wenjing Yang*, Peijin Liu, Qiang Li, Guoqiang He
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 100-100, 2019, DOI:10.32604/icces.2019.05495
    Abstract Particle manipulation due to SSAW has been spread widely in many lab-on-a-ship applications such as flow cytometry, single molecular detection, protein folding, cell sorting and enzymatic kinetics. For microflow, particle separation can be quite difficult, since the laminar nature of microfluidic flow predominantly determines the particle motion following the fixed streamlines. Thus the lateral forces are necessary to change the original path of particles, involving hydrodynamic force, electro-kinetic force, dielectrophoresis force and acoustic force. To date, the standing surface acoustic wave (SSAW) shows the unique abilities in separating particles in micro-channel. Based on particle size, density and shape, with proper… More >

  • Open Access

    ABSTRACT

    Radiation Response of Nanotwinned Cu and the Stability of Stacking Fault Tetrahedron Under Shear

    Lianping Wu, Wenshan Yu*, Shuling Hu, Shengping Shen*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 101-101, 2019, DOI:10.32604/icces.2019.05016
    Abstract Multiple collision cascades (MCC) of nanotwinned (nt) Cu with three different twin spacings are performed to model the response of nt Cu upon a radiation dose of 1 displacement per atom (dpa). The microstructural evolutions during the radiation process shows that the main radiation defect in Cu is stacking fault tetrahedron (SFT). Smaller size of defect clusters and lower defect density are seen in the nt Cu with smaller twin spacing. Besides, the potential formation and elimination mechanisms of SF are found to be due to the climb of Frank partial dislocation and glide of Shockley partial dislocations. Furthermore, we… More >

  • Open Access

    ABSTRACT

    Crack-Induced Resistivity Changes in Carbon Nanotube Reinforced Composite

    Luis Rodríguez-Tembleque1,*, Enrique García-Macías1, Federico C. Buroni1, Felipe García-Sánchez2, Andrés Sáez1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 102-102, 2019, DOI:10.32604/icces.2019.05138
    Abstract The unique intrinsic physical properties, particularly rigidity and strength-to-weight ratio, of carbon nanotubes (CNTs) suggest that they are ideal fillers for high performance composites. However, most recent advances have allowed not only their rigidity and strength capacity, but also additional self-sensing capabilities. Such multifunctional capabilities of CNT reinforced composites open a vast range of possibilities in the field of Structural Health Monitoring. In particular, this work analyzes-from a numerical perspective-two possible effective implementations of CNTs reinforcements for crack and damage detection in structures or mechanical systems. The first strategy considers a reinforced epoxy strip-like sensor on a structure that assists… More >

  • Open Access

    ABSTRACT

    Buckling Detection Using Carbon Nanotube Reinforced Composite Sensors

    Enrique García-Macías1, Luis Rodríguez-Tembleque1, Felipe García-Sánchez2, Andrés Sáez1,*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 103-103, 2019, DOI:10.32604/icces.2019.05220
    Abstract Enhancing the strength-to-weight ratio in structural engineering has traditionally attracted great research efforts from both scientist and practicing engineers. Development of new composite materials and/or alternative structural configurations have led to slender designs, which may be prone to buckling failure. Meanwhile, the most recent advances in the field of Nanotechnology have allowed the development of new composite materials with not only low weight and adequate load-bearing capacity, but also additional self-sensing capabilities. Such multifunctional composites open a vast range of possibilities in the field of Structural Health Monitoring. In particular, this work analyzes-from a numerical perspective-the effective implementation of carbon… More >

  • Open Access

    ABSTRACT

    Efficient Computation of the Green’s Function and Its Derivatives for Three-Dimensional Piezoelectricity

    Cristiano Ubessi1, Federico C. Buroni2,*, Gabriel Hattori3, Andrés Sáez4, Rogério J. Marczak1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 104-104, 2019, DOI:10.32604/icces.2019.05420
    Abstract Efficient three-dimensional infinite Green’s function and its first- and second-order derivatives for materials with piezoelectric coupling are studied in this paper. The procedure is based on an explicit solution recently introduced by the authors which presents three valuable characteristics: (i) it is explicit in terms of the Stroh’s eigenvalues, (ii) it remains well-defined when some Stroh’s eigenvalues are repeated (mathematical degeneracy) or nearly equal (quasi-mathematical degeneracy), and (iii) it is exact. Then, this solution is used to compute coefficients for a double Fourier series representation of the Green’s function and its derivatives. These Fourier expansion representations are realvariable which is… More >

  • Open Access

    ABSTRACT

    Comparative Study on Dry Reforming of Methane Over Co-M (M=Ce, Fe, Zr) Catalysts Supported on N-Doped Activated Carbon

    Yinghui Sun1, Guojie Zhang1,2,*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 105-105, 2019, DOI:10.32604/icces.2019.05173
    Abstract A series of Co-M (M = Ce, Fe, Zr) binary oxides supported on N-doped catalysts were prepared by impregnation methods and tested for DRM reaction. Moreover, the influence of Co and Ce atomic contents in the catalysts on DRM performance was investigated. Significant enhancement of activity performance over Ce promoted 3Co-1Ce/AC-N catalyst was observed. Compared with Fe and Zr, the catalyst with 1/4 mol% of Ce showed the highest activity and was higher than the supported Co catalyst. The calcined and spent catalysts were characterized by XPS, H2-TPR, TEM and EDX mapping studies. The characterization results demonstrated that the improved… More >

  • Open Access

    ABSTRACT

    II-VI Based Inorganic-Organic Hybrid Quantum Structures with High Degree of Structural Ordering, Long-Term Stability, and Novel Properties

    Yong Zhang
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 106-107, 2019, DOI:10.32604/icces.2019.05864
    Abstract Translational symmetry ensures phase coherency of a physical process among different units of a crystal, and thus produces collective quantum effects beyond the sum of the units. Any significant physical and/or chemical fluctuation, which typically exists in a semiconductor alloy or self-assembled or artificially grown nanostructure array, would hinder our ability to study and use the collective behavior relying on this coherency. Man-made structures remain as one of the central interests since semiconductor superlattices were proposed by Esaki and Tsu in 1970. Unfortunately, man-made structures with both genuine long- and short-range order are rare. Here a new family of inorganic-organic… More >

  • Open Access

    ABSTRACT

    Multi-Scale Asymptotic Computations of Axisymmetric Piezoelectric Problem for Composite Structures

    Qiang Ma1,*, Junzhi Cui2, Xue Jang3
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 108-108, 2019, DOI:10.32604/icces.2019.04487
    Abstract A new second-order two-scale (SOTS) asymptotic coupled piezoelectric models are developed for the axisymmetric composites. The governing piezoelectric equations are compactly formulated in cylindrical coordinates, and the composite domains are assumed to be periodically occupied by the representative cells. The multi-scale asymptotic expansions for the displacement and the electric potential are formally defined and the effective elastic, piezoelectric, and dielectric coefficients are expressed in terms of the microscopic functions defined on the cell domain. Particularly, the cell solutions and the homogenized solutions for the plane axisymmetric problem are derived analytically. The corresponding SOTS finite element procedure is proposed, in which… More >

  • Open Access

    ABSTRACT

    Micro/Nano-Sized Piezoelectric Structures Analyzed by Strain Gradient Theory

    Jan Sladek1, Vladimir Sladek1 and Choon-Lai Tan2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 109-111, 2019, DOI:10.32604/icces.2019.05685
    Abstract In recent years, a special attention has been directed to the investigation of the relations between the macroscopic material behaviour and its microstructure. For most of the analyses of composite structures, effective or homogenized material properties are used, instead of taking into account the individual component properties and geometrical arrangements. The effective properties are usually difficult or expensive to measure and in the design stage the composition may vary substantially, making frequent measurements prohibitive. Hence a lot of effort has been devoted into the development of mathematical and numerical models to derive homogenized material properties directly from those of the… More >

  • Open Access

    ABSTRACT

    Mechanoluminescence in Elastomers: Physics and Multiscale Modeling

    Mikhail Itskov*, Khiȇm Ngoc Vu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 112-112, 2019, DOI:10.32604/icces.2019.05013
    Abstract Mechanoluminescence is a phenomenon where broken chemical bonds send out visible light upon stress application. To this end, special mechanophores are added into the polymer network prior to its vulcanization. As such, bis(adamantyl) 1,2-dioxetane can be used. The breakage of the dioxetane cross-linker is irreversible and can directly be used to assess the damage evolution in rubber-like materials. The intensity of the emitted light correlates with the underlying evolution of chain scission in polymers. In this contribution, an anisotropic analytical network-averaging concept [1] is utilized to model mechanoluminescence, Mullins effect, hysteresis and induced anisotropy in mechano-chemically responsive polymeric materials [2].… More >

  • Open Access

    ABSTRACT

    Towards Computational Design of Single Transition Metal Atom Catalysts for Nitrogen Fixation

    Xiongyi Liang*, Chi-Man Lawrence Wu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 113-113, 2019, DOI:10.32604/icces.2019.05079
    Abstract Ammonia (NH3) plays an essential role in agriculture to meet global population explosion. Although the atmosphere consists of more than 78% of Nitrogen (N2), industrial NH3 synthesis from atmospheric N2 gas requires harsh conditions of temperature (700~850 K) and pressure (50~200 atm), which annually consuming 2% of the world’s power. Recently, an electrocatalytic NH3 fixation process under ambient condition was introduced. With this, six protons and electrons are gradually added (6H+ + 6e- + N2= 2NH3), instead of breaking the triple bonds of N2 in the traditional method, thus saving dramatic amount of energy. Along this theme, the synthesis of… More >

  • Open Access

    ABSTRACT

    Solutions of Nonlinear Bending Problems of Plates with Complex Shapes

    Jizeng Wang*, Cong Xu, Youhe Zhou
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 114-114, 2019, DOI:10.32604/icces.2019.05298
    Abstract A high-order wavelet method is developed for general nonlinear boundary value problems with complex boundaries in mechanics. This method is established based on wavelet approximation of multiple integrals of interval bounded functions combined with an accurate and adjustable boundary extension technique. The convergence order of this approximation has been proven to be N as long as a typical family of wavelets named Coiflets with N-1 vanishing moment are adopted, which can be any positive even integers. Error analysis has proven that the proposed method is in accuracy of order N, and condition numbers of relevant matrices are almost independent of… More >

  • Open Access

    ABSTRACT

    The Higher-Order Continuum Model and Its Application for Expansive Soil

    Yuzhou Sun1, Yuchao Mu2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 115-115, 2019, DOI:10.32604/icces.2019.05304
    Abstract Due to its double-structure property, the higher-order continuum theory is adopted to study the constitutive behavior of expansive soil. The higher-order strain and scale factor are considered to describe the effect of the microscale structural property on the macroscale behavior, and a higher-order multiscale constitutive model is developed for expansive soil. The effect of the microscale structural property is investigated through the theoretical and experimental studies based on the developed model. In virtue of a representative elementary volume, the double-structure property is better studied for expansive soil. A variational equation is developed with the contribution of the liquid and gas… More >

  • Open Access

    ABSTRACT

    Multi-Field Coupling Behaviors on Phonon and Thermal/Electrical Properties in Semiconductor Nanostructures

    Linli Zhu
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 116-116, 2019, DOI:10.32604/icces.2019.05318
    Abstract Low-dimensional semiconductor structures such as nanofilms and nanowires have stimulated considerable interest due to their potential applications in nanoelectronic or nanomechanical devices. In this presentation, the effects of pre-stress field and surface stress on the phonon and thermal/electrical properties for semiconductor nanostructures are investigated theoretically. The continuum elastic model is employed to calculate the spatially confined phonon properties. The acoustoelastic effects and surface energy effects are taken into account in calculating the phonon properties of nanostructures. Since the thermal and electric properties are associated with phonon properties of semiconductors, the phonon thermal conductivity, electron-acoustic phonon scattering rate and the carrier… More >

  • Open Access

    ABSTRACT

    Ab-initio Insights into the Single Superconducting CaCuO2/SrTiO3 Interface

    Jinjin Cao, Xiaofan Gou*
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 117-117, 2019, DOI:10.32604/icces.2019.05484
    Abstract In order to achieve higher superconducting transition temperature (Tc), the low dimensional superconducting systems have been the interest in recent years. The recent improved film deposition techniques have allowed the realization of the artificial heterostructures, with atomically flat interfaces. The relatively higher Tc was achieved in these heterosturcture interfaces, which is not present in the single constituent. For instance, the quasi-two-dimensional (quasi-2D) superconductivity was found in the FeSe/SrTiO3 interface with Tc as high as 109 K, which is rather larger than that in the bulk FeSe with Tc of 8 K. Such similar phenomenon also appears in the other quasi-2D… More >

  • Open Access

    ABSTRACT

    DNA Cracks at the Region of Protein Binding Under the Action of Stretch

    Qingjia Chi*, Xinge Geng
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.1, pp. 118-118, 2019, DOI:10.32604/icces.2019.05168
    Abstract The binding of DNA to protein in the cellular nucleus is a common phenomenon. DNA molecules will soften at the binding region when they adhere to proteins. Softening will affect the mechanical properties significantly. However, the mechanism underlying the mechanical softening remains to be explored. To understand the changes in the mechanical properties of DNA, the peridynamics technique can effectively capture the stress of the softened DNA under tensile forces. And later the results were verified by finite element computations. Utilizing the computations of perydynamics to reveal the stretch of the double-stranded DNA. The results demonstrated DNA was easy to… More >

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