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  • Open Access

    ABSTRACT

    Enhanced transport phenomena in the Navier-Stokes shell-like slip layer

    Janusz Badur, MichaA, Karcz, Marcin LemaA"ski, Lucjan NastaA,ek

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 91-92, 2011, DOI:10.3970/icces.2011.019.091

    Abstract Due to last mass flow rate measurements in gas micro and nano-channels several discrepancies in the mathematical modeling have been arise. The most important one, is the "flow enhancement" related with the wall slip phenomena. Thus, in the literature, there is opinion that the Navier-Stokes slip condition is correct only in certain restricted circumstances, particularly those restricted to the first order boundary conditions. A one possible way for solving of the above discrepancies, used recently in the literature, is developing a variety of so-called ßecond order boundary conditions". This way is incorrect since it always leads to an inconsistency between… More >

  • Open Access

    ABSTRACT

    A Novel Method for In-situ Fabrication of Graded or Aligned Materials in High Magnetic Fields

    Qiang Wang, Tie Liu, Yin Liu, Yi Yuan, Jicheng He

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 89-90, 2011, DOI:10.3970/icces.2011.019.089

    Abstract Recently, the application of high magnetic fields to materials processing is considering a promising approach to prepare functional materials with special performances. In the present study, based on the techniques of solidification, quenching, and isothermal annealing in both the semisolid and melting states in high magnetic fields, the solidified structure evolution of the Mn-Sb and Al-Ni alloy systems was systematically studied under different magnetic field conditions. A novel method was proposed to in situ fabricate the graded or aligned materials using gradient or uniform high magnetic fields. The results show that the primary MnSb particles were gathered in one certain… More >

  • Open Access

    ABSTRACT

    A New Combined Scheme of Discrete Element Method and Meshless Method for Numerical Simulation of Impact Problems

    Li Shan, Ming Cheng, Kaixin Liu

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 87-88, 2011, DOI:10.3970/icces.2011.019.087

    Abstract In the present paper, a combined scheme of discrete element method (DEM) and meshless method for numerical simulation of impact problems is proposed. Based on the basic principle of continuum mechanics, an axisymmetric DEM framework is estabilished for modeling the elastoplastic behavior of solid materials. A failure criterion is introduced to model the transformation from a continuum to a discontinuum. The friction force between contact elements is also considered after the failure appears. So our scheme can calculate not only the behavior of continuum and discontinuum, but also the transformation process from continuum to discontinuum. In addition, a meshless interpolation… More >

  • Open Access

    ABSTRACT

    Effects of Salvia Miltiorrhiza on Zero-Stress State of Rat's Abdominal Aorta

    Hui Han, Yi Wah Mak, Wei Huang

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 85-86, 2011, DOI:10.3970/icces.2011.019.085

    Abstract The root of Salvia miltiorrhiza bunge, Danshen, is a traditional Chinese herb known to prevent hypertension. However, the mechanism of how Danshen affects the mechanical properties of blood vessel is not clear. In this project, we studied the effects of Danshen on zero-stress state of rat's abdominal aorta, which is the basic configuration of blood vessel affected solely by intrinsic parameters.
    Sprague Dawley rats, male, around 350g, were used. The zero-stress state of a blood vessel can be very different from the in vivo state and the no-load state of the vessel. At the in vivo state, the rat's… More >

  • Open Access

    ABSTRACT

    Simulation Study of Hydrogen Injection into Graphite

    A. Takayama, S. Saito, A. M. Ito, S. Yonemura, H. Nakamura

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 83-84, 2011, DOI:10.3970/icces.2011.019.083

    Abstract We have been developing a molecular dynamics (MD) simulation code, a binary collision approximation (BCA) based simulation code, and a BCA-MD hybrid simulation code. In this paper, an overview of the codes is presented. BCA-based simulation results of hydrogen isotopes injection into graphite target are also shown. Detailed description is given as a full abstract. More >

  • Open Access

    ABSTRACT

    The Nonlinear Theory of Thermoelastic Shells Undergoing Phase Transitions

    Victor A. Eremeyev

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 81-82, 2011, DOI:10.3970/icces.2011.019.081

    Abstract The aim of this work is to discuss the nonlinear theory of shells made of material undergoing phase transitions (PT). The interest to mechanics and thermodynamics of thin-walled structures with PT is motivated by the recent investigations of thin martensitic films and biological membranes. Here we present statements of the boundary-value problems of shells and plates with PT within the dynamically and kinematically exact theory of shells. In this shell theory the translation and rotation fields are the kinematically independent variables. The theoretical model is illustrated by the examples of thin circular cylindrical shell and circular plate made of two-phase… More >

  • Open Access

    ABSTRACT

    Stability Analysis and Experiment of the Spherical Shell

    Du Qinghai, Cui Weicheng, Wang Yongjun

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 79-80, 2011, DOI:10.3970/icces.2011.019.079

    Abstract The spherical shell is a typical form of revolution shells, which is widely used in pressure vessel and piping industry, nuclear power industry and ocean engineering for its specific structural shape to obtain kinds of performance. However compared to the cylindrical or conical shell, the spherical shell is mainly used as main structure or pressure hull in underwater engineering because of the superiority of theoretical solution and its manufacture. For the significance of the spherical shell, many researchers in the region of engineering and mechanics have spent great efforts to solve it and do lots of experiments in order to… More >

  • Open Access

    ABSTRACT

    Progresses of the hybrid quantum-classical simulation: development of O(N)-DFT method and application to Li-diffusion in graphite

    Nobuko Ohba, Shuji Ogata

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 77-78, 2011, DOI:10.3970/icces.2011.019.077

    Abstract We have been developing the concurrent-type, hybrid quantum-classical simulation scheme for various atomic processes at liquid-solid interfaces [1]. In this scheme, the density-functional theory (DFT) method is applied to the "quantum" region to calculate the electronic structure; while the semi-empirical inter-atomic potential, to the "classical" region. In this talk we review its recent developments both from methodology and application viewpoints.
    In the hybrid simulation, the DFT method that is applied at each time-step to a cluster of typically a hundred atoms (i.e., the QM region) consumes most of the computation power. It is highly desirable to develop a less… More >

  • Open Access

    ABSTRACT

    Numerical modeling of resin film infusion process with compaction and its application

    Duning Li, Yufeng Niei?a, Xuemei Zhou, Li Cai

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 75-76, 2011, DOI:10.3970/icces.2011.019.075

    Abstract In this study, the efficient discrete model including the resin infusion and the fiber compaction is developed to simulate the RFI (resin film infusion) process. The non-linear governing equations are derived by the Darcy's law, the Terzaghi's law and the continuity equations. The finite element method and the finite difference method are used to discretize the proposed equations, and the VOF method is used to track the filling front. Compared with the analytical results of Park, our numerical results agree well with them. Furthermore, we analyze the RFI process of BMI/G0814, and simulate the resin pressure, the fiber volume fraction… More >

  • Open Access

    ABSTRACT

    A Study on Dynamic Modeling Considering Fuel Sloshing for Korean Lunar Module

    Sanghyun Shim, Kwangjin Kim, Sangchul Lee, Sangho Ko, Jayoung Kang, Dongyoung Rew, Gwanghyeok Ju

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 73-74, 2011, DOI:10.3970/icces.2011.019.073

    Abstract The aim of this paper is to discuss the main issues related to modeling and simulation of the Korean lunar module. Lunar module usually consists of a rigid platform, attitude control actuators and a fuel tank. For dynamical modeling, we first assumed the lunar module as a rigid body and derived equations of motion by considering allocation of reaction thrusters and reaction wheel assembly(RWA). Fuel sloshing in lunar module and its influence on attitude dynamics are an important issue in the research field of space technology. In order to include the effect of fuel sloshing on the dynamics, we model… More >

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