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  • Open Access

    ARTICLE

    Intravascular Ultrasound (IVUS)-Based Computational Modeling and Planar Biaxial Artery Material Properties for Human Coronary Plaque Vulnerability Assessment

    Mingchao Cai1, Chun Yang2, Mehmet H. Kural1, Richard Bach3, David Muccigrosso4, Deshan Yang5, Jie Zheng4, Kristen L. Billia1, Dalin Tang1,6
    Structural Longevity, Vol.6, No.2, pp. 39-46, 2011, DOI:10.3970/sl.2011.006.039
    Abstract Image-based computational modeling has been introduced for vulnerable atherosclerotic plaques to identify critical mechanical conditions which may be used for better risk assessment and rupture predictions. In vivo patient-specific coronary plaque models are lagging due to limitations on non-invasive image resolution, flow data, and vessel material properties. We propose a procedure where intravascular ultrasound (IVUS) imaging, biaxial mechanical testing and computational modeling are combined together to acquire better and more complete plaque data and make more accurate plaque vulnerability assessment and predictions. More >

  • Open Access

    ARTICLE

    Implement and validation of Viscous Numerical Wave Flume Based on Finite Element Method and CLEAR-VOF Method

    L. Lu1, B. Teng2, B. Chen3
    Structural Longevity, Vol.6, No.2, pp. 47-54, 2011, DOI:10.3970/sl.2011.006.047
    Abstract This work describes the numerical implements of a two-dimensional viscous Numerical Wave Flume (NWF), which is based on the Finite Element Method (FEM), Computational Lagrangian-Eulerian Advection Remap Volume of Fluid Method (CLEAR-VOF), internal wave generation and artificial wave damping. Owning to the inherent consistence of CLEAR-VOF with FEM, it allows the simulations to be conducted in the context of irregular mesh partition. The present numerical wave flume is validated by the problems of standing wave trains in front of vertical wall, liquid sloshing in container with multi-baffles, solitary wave propagation and diffusion over vertical step, wave-induced fluid resonance in narrow… More >

  • Open Access

    ARTICLE

    Air Quality Modeling in the Automobile

    B. Mei1, X. Wang2
    Structural Longevity, Vol.6, No.2, pp. 55-64, 2011, DOI:10.3970/sl.2011.006.055
    Abstract Automobiles are used every day and air quality in the automobile is directly related to people’s health. This term paper focuses on the distribution of automotive interior carbon dioxide on the highway. A typical sedan is chosen as a sample. Carbon-dioxide meter and wind meter are used to get essential data. Then, the data is analyzed by the commercial CFD software — GAMBIT® and FLUENT®. After plotting and comparing the contours of the distribution, how changing the fan speed will change the distribution is got. More >

  • Open Access

    ARTICLE

    Modified Approach for Optimum Position and Sizing of Piezoelectric Actuator for Steering of Parabolic Antenna

    Vijay Kumar Gupta1
    Structural Longevity, Vol.6, No.2, pp. 65-75, 2011, DOI:10.3970/sl.2011.006.065
    Abstract Various applications of piezoelectric actuators have been explored over the years. One such application is use of piezoelectric actuators for shape control of structures. In this paper, steering of parabolic antenna by deforming the antenna surface using piezoelectric actuators has been explored. Optimization based on Genetic Algorithm is carried out to find out optimum location, length and applied electric field to the piezoelectric actuators to achieve desired steering of antenna. Constraints are included in the objective function using penalty approach. Shell finite element model is used to determine deformations induced by the actuators. As the wavelength is sufficiently smaller than… More >

  • Open Access

    ARTICLE

    Discretisation of the velocity-pressure formulation with integrated radial-basis-function networks

    N. Thai-Quang1, K. Le-Cao1, N. Mai-Duy1, T. Tran-Cong1
    Structural Longevity, Vol.6, No.2, pp. 77-91, 2011, DOI:10.3970/sl.2011.006.077
    Abstract This study is concerned with the use of integrated radial-basis-function networks (IRBFNs) for the discretisation of the velocity-pressure formulation in two dimensions on Cartesian grids. In the approximation of the field variables (i.e. velocity components and pressure), instead of using low-order polynomial interpolants, we employ global IRBFNs along grid lines (i.e. one-dimensional IRBFNs). In the imposition of boundary condition for the pressure, we propose two treatments, namely Treatment A and Treatment B. For both treatments, Neumann boundary conditions are transformed into Dirichlet ones. The former is based on values of the pressure at interior nodes along a grid line and… More >

  • Open Access

    ARTICLE

    Compact Local Stencils Employed With Integrated RBFs For Fourth-Order Differential Problems

    T.-T. Hoang-Trieu1, N. Mai-Duy1, T. Tran-Cong1
    Structural Longevity, Vol.6, No.2, pp. 93-107, 2011, DOI:10.3970/sl.2011.006.093
    Abstract In this paper, new compact local stencils based on integrated radial basis functions (IRBFs) for solving fourth-order ordinary differential equations (ODEs) and partial differential equations (PDEs) are presented. The integration constants arising from the construction of IRBFs are exploited to incorporate into the local IRBF approximations values of the ODEs/PDEs at selected nodal points. The proposed stencils, which lead to sparse system matrices, are numerically validated through the solution of several analytic test problems. Numerical results indicate that their solutions converge very fast with grid refinement. More >

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