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  • Open Access

    ARTICLE

    Numerical Simulations for Stochastic Computer Virus Propagation Model

    Muhammad Shoaib Arif1, *, Ali Raza1, Muhammad Rafiq2, Mairaj Bibi3, Javeria Nawaz Abbasi3, Amna Nazeer3, Umer Javed4

    CMC-Computers, Materials & Continua, Vol.62, No.1, pp. 61-77, 2020, DOI:10.32604/cmc.2020.08595

    Abstract We are presenting the numerical simulations for the stochastic computer virus propagation model in this manuscript. We are comparing the solutions of stochastic and deterministic computer virus models. Outcomes of a threshold number R0 hold in stochastic computer virus model. If R0 < 1 then in such a condition virus controlled in the computer population while R0 > 1 shows virus rapidly spread in the computer population. Unfortunately, stochastic numerical techniques fail to cope with large step sizes of time. The suggested structure of the stochastic non-standard finite difference technique can never violate the dynamical properties. On More >

  • Open Access

    ARTICLE

    Numerical Simulations of the Ice Load of a Ship Navigating in Level Ice Using Peridynamics

    Yanzhuo Xue1, Renwei Liu1, Yang Liu1,*, Lingdong Zeng1, Duanfeng Han1

    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 523-550, 2019, DOI:10.32604/cmes.2019.06951

    Abstract In this study, a numerical method was developed based on peridynamics to determine the ice loads for a ship navigating in level ice. Convergence analysis of threedimensional ice specimen with tensile and compression loading are carried out first. The effects of ice thickness, sailing speed, and ice properties on the mean ice loads were also investigated. It is observed that the ice fragments resulting from the icebreaking process will interact with one another as well as with the water and ship hull. The ice fragments may rotate, collide, or slide along the ship hull, and More >

  • Open Access

    ABSTRACT

    Fully-Coupled Fluid-Structure Interaction (FSI) Simulations of Heart Valve-Left Ventricle Dynamics

    Wei Sun1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 64-64, 2019, DOI:10.32604/mcb.2019.08533

    Abstract Fluid–structure interaction (FSI) is a common phenomenon in biological systems. FSI problems of practical interest, such as fish/mammalian swimming, insect/bird flight, and human cardiac blood flow and respiration often involve multiple 3D immersed bodies with complex geometries undergoing very large structural displacements, and inducing very complex flow phenomena. Simulation of heart valve FSI is a technically challenging problem due to the large deformation of the valve leaflets through the cardiac fluid domain in the atrium and ventricular chambers.
    Recently, we developed a FSI computational framework [1] for modeling patient-specific left heart (LH) dynamics using smoothed… More >

  • Open Access

    ABSTRACT

    Patient-Specific Computational Approach for Trans Catheter Aortic Valve Replacement (TAVR): Pre-Procedural Planning for Enhancing Performance and Clinical Outcomes

    Ram P. Ghosh1, Matteo Bianchi1, Gil Marom2, Oren M. Rotman1, Brandon Kovarovic1, Danny Bluestein1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 12-14, 2019, DOI:10.32604/mcb.2019.07379

    Abstract This article has no abstract. More >

  • Open Access

    ABSTRACT

    A Paris Law-Based Cohesive Zone Model for Fatigue Crack Growth Simulations

    Akiyuki Takahashi1,*, Takaki Fujiwara1, Yuichi Shintaku2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 170-170, 2019, DOI:10.32604/icces.2019.05151

    Abstract This paper presents a Paris law-based cohesive zone model (CZM) for fatigue crack growth simulations to enable the consideration of the plasticity induced crack closure effect, which is known to be a source of substantial crack growth retardation. In order to avoid the addition of any redundant model parameters, the basic equation of the CZM is derived from the Paris law so that the CZM has only the parameters of Paris law. Thus, the parameters can be determined by referring the existing experimental data of the Paris law without any troublesome fitting processes. Only the More >

  • Open Access

    ABSTRACT

    Simulations of Core Collapse Supernova Explosion on PEZY-SC Processors and GPUs

    Hideo Matsufuru1,*, Kohsuke Sumiyoshi2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.4, pp. 90-90, 2019, DOI:10.32604/icces.2019.05390

    Abstract The core collapse supernovae are one of key phenomena to understand the history of the Universe and the origin of heavy elements. To understand their explosion mechanism, large scale numerical simulations are essential that require to solve a multi-physics system described by coupled equations of hydrodynamics and neutrino-radiation transfer in multidimensions. Since the neutrino transfer is governed by the Boltzmann equation in six-dimensional space, necessary computational resource rapidly increases as the number of grids in simulations grows. So far numerical studies have been performed mostly on massively parallel computers and only a few studies have… More >

  • Open Access

    ABSTRACT

    Interaction Simulations Between Fluids and Complicated Structures Using EMPS-FEM

    Zumei Zheng1, Naoto Mitsume1, Guangtao Duan1, Shunhua Chen1,*, Tomonori Yamada1, Shinobu Yoshimura1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.3, pp. 59-59, 2019, DOI:10.32604/icces.2019.05279

    Abstract The interactions between fluids and complicated solid structures are common phenomena in practical engineering applications, e.g., water-tire interaction in the hydroplaning problem. In this work, we advocate the coupled explicit moving particle simulation method and the finite element method (EMPS-FEM) to solve this problem, where the EMPS is used to describe the fluid flow and the FEM is for structural deformation. In the existing EMPS-FEM method, the interface interaction between the fluid and the structure is solved by an explicitly represented polygon (ERP) wall boundary model. For the situations with complicated solid structures, e.g.,angled edges, More >

  • Open Access

    ABSTRACT

    Configurational Forces in Three-Dimensional Crack Loading Analyses and Crack Growth Simulations

    Kevin Schmitz1,*, Paul Judt1, Andreas Ricoeur1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 12-12, 2019, DOI:10.32604/icces.2019.05164

    Abstract In order to evaluate cracks in three-dimensional (3D) specimens, it is necessary to perform crack loading analyses. Loading quantities are calculated, employing the distribution of stress and strain in the vicinity of the crack front. In thin planar structures with plane mode I/II loading, analyses at simplified two-dimensional boundary value problems provide sufficiently accurate loading quantities. However, for an increasing thickness or presence of mode III loading, the plane assumptions in general lose their validity. Three-dimensional structures exhibit spatial stresses, leading to a non-constant stress distribution along the crack front and to non-uniform crack front… More >

  • Open Access

    ARTICLE

    The Algorithm of Chemical Species Analysis for Ab Intio Molecular Dynamics Simulations and Its Application

    Zhiyi Han1, Yugai Huang2,3, Xiaoqiang Xie1, Ying Mei1, Bin Gu1,*

    CMC-Computers, Materials & Continua, Vol.59, No.3, pp. 995-1003, 2019, DOI:10.32604/cmc.2019.02181

    Abstract In ab initio molecular dynamics (AIMD) simulations of chemical reactions, it is important but difficult to identify the chemical species in the trajectory automatically and quickly. In this paper, based on the chemical graph theory, an algorithm for molecular species identification, according to the molecular coordinates and empirical bond length database, is presented. As an example, the chemical species in condensed glycine at room temperature are investigated with our algorithm in detail. The chemical species, including canonical and zwitterionic glycine, their protonated and de-protonated states, and the free protons, are all identified, counted and recorded correctly. More >

  • Open Access

    ARTICLE

    Centrifuge Model Tests and Numerical Simulations of the Impact of Underwater Explosion on an Air-Backed Steel Plate

    Zhijie Huang1,2,3, Zuyu Chen1,2,3, Xiaodan Ren4,*, Jing Hu3, Xuedong Zhang3, Lu Hai4

    CMES-Computer Modeling in Engineering & Sciences, Vol.118, No.1, pp. 139-155, 2019, DOI:10.31614/cmes.2019.04596

    Abstract Damage and threats to hydraulic and submarine structures by underwater explosions (UNDEXs) have raised much attention. The centrifuge model test, compared to prototype test, is a more promising way to examine the problem while reducing cost and satisfying the similitude requirements of both Mach and Froude numbers simultaneously. This study used a systematic approach employing centrifuge model tests and numerical simulations to investigate the effects of UNDEXs on an air-backed steel plate. Nineteen methodical centrifuge tests of UNDEXs were conducted. The shock wave pressure, bubble oscillation pressure, acceleration and the strain of the air-backed steel More >

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