Home / Journals / CMES / Vol.104, No.2, 2015
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  • Open Access

    ARTICLE

    Dynamic Instability of Straight Bars Subjected to Impulsive Axial Loads Using the DEM

    Letícia Fleck Fadel Miguel1, Leandro Fleck Fadel Miguel2, João Kaminski Jr.3
    CMES-Computer Modeling in Engineering & Sciences, Vol.104, No.2, pp. 87-104, 2015, DOI:10.3970/cmes.2015.104.086
    Abstract Since the half of the XX century, attention was given to the instability of structures under parametric excitation, especially under periodic loads. On the other hand, the instability of bars subjected to axial loads of impulsive type has been little studied, in spite of the practical importance of the topic. Thus, in Engineering Design it is frequently supposed, without tests or additional verifications, that an axial load of short duration can exceed the Euler critical load of the bar without inducing damage in the same.
    Within this context, this paper proposes the use of the truss-like Discrete Element Method… More >

  • Open Access

    ARTICLE

    Turbulent Inlet Conditions Modeling using Large-eddy Simulations

    M.M.R. Damasceno1, J.M. Vedovoto1, A. da Silveira-Neto1
    CMES-Computer Modeling in Engineering & Sciences, Vol.104, No.2, pp. 105-132, 2015, DOI:10.3970/cmes.2015.104.105
    Abstract Turbulence is a phenomenon which presents peculiarities when it is experimented or simulated. This occurs due to its complexity and high sensibility to the inlet conditions of the turbulent flow fields, as well as the presence of a large range of time and length scales. A simplification for this situation is obtained with the use of approximations and turbulence models. In the present work, the Largeeddy Simulations methodology was applied, aiming the modeling of the previously mentioned complexity, which consists in using a filter to resolve the large scales while the remaining scales were determined by classical and dynamic Smagorinsky… More >

  • Open Access

    ARTICLE

    The Fundamentals Underlying the Computations of Acceleration for General Dynamic Applications: Issues and Noteworthy Perspectives

    M. Shimada1, A. Hoitink1, K. K. Tamma1,2
    CMES-Computer Modeling in Engineering & Sciences, Vol.104, No.2, pp. 133-158, 2015, DOI:10.3970/cmes.2015.104.133
    Abstract To-date, with the exception of the Newmark method and the midpoint rule, most computational algorithms under the umbrella of LMS methods, which are predominantly employed in research and commercial software fail to properly evaluate acceleration computations accurately for conducting the numerical dynamic simulations. Indeed, this is not trivial and a sound theoretical basis of the fundamental underlying issues is described in detail. In this paper, we provide a resolution and point-out several noteworthy perspectives to address the proper evaluation of acceleration computations for structural dynamics applications with focus on the class of LMS methods as an illustration. More >

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