Open Access
ARTICLE
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
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
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
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
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
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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