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    ARTICLE

    Numerical Analysis on the Interaction between Two Zipper Frac Wells with Continuum Damage Model

    Xinpu Shen1
    Structural Longevity, Vol.9, No.1, pp. 1-22, 2013, DOI:10.3970/sl.2013.009.001
    Abstract Zipper fracturing (‘zipper frac’) is a popular reservoir stimulation method used to develop unconventional resources, particularly for tight sand oil, shale oil, and shale gas. Adequately understanding the influence of neighboring stimulation stages on generating the desired stimulated reservoir volume (SRV) has significant impact on fracturing design. To discover the mechanism of interaction between neighboring stimulation stages, numerical simulation was performed on the stimulation process step-by-step using the coupled hydro-mechanical Finite Element Method. A continuum damage model is used to simulate fracture phenomena created by fluid injection used for reservoir stimulation.
    Numerical results presented here include: 1) distribution of the… More >

  • Open Access

    ARTICLE

    The Dynamic Response Analysis of Concrete Gravity Dam under the Earthquake

    Yang Lu1, Li Shi-Min1, Cao Peng2, Shen Xin-Pu1
    Structural Longevity, Vol.9, No.1, pp. 23-36, 2013, DOI:10.3970/sl.2013.009.023
    Abstract Based on the finite element software ABAQUS, the dynamic time history of the concrete gravity dam has been analyzed. Considering the gravity dam’s action of dynamic water pressure effect under the earthquake, we made a layer of user unit and given the unit quality through the door subroutine UEL relying on additional quality law, and the unit has been attached to the dam. By the statistics and analysis about displacement, stress, damage and energy of the feature points of the dam, we can conclude that: the dam stress and displacement of the most unfavorable moment most concentrated in a fairly… More >

  • Open Access

    ARTICLE

    Application of the Multi Scaling Characteristic Time Expansion Method for Estimating Nonlinear Restoring Forces

    Yung-Wei Chen1, Jiang-Ren Chang2, Fu-Hsuan Hsieh2, Che-Wei Chen2
    Structural Longevity, Vol.9, No.1, pp. 37-58, 2013, DOI:10.3970/sl.2013.009.037
    Abstract Since numerical instability phenomena always arise in the solving process for parameters identification of structural vibration. To resolve such a problem, the multi scaling characteristic time expansion method (MSCTEM) in conjunction with the natural regularization method is adopted to overcome the higher order numerical oscillation problem when polynomial series expansion is necessary. Due to inclusion of the characteristic length (CL) in the scheme, the ill-posed problem of the constructed Vandwemonde matrix will be overcome and will also increase the term number of polynomial series. Thus, the ill condition and numerical instability of numerical calculations can be resolved. Besides, to overcome… More >

  • Open Access

    ARTICLE

    Group Preserving Scheme for Simulating Dynamic Ship Maneuvering Behaviors

    Yung-Wei Chen1, Jiang-Ren Chang2, Wun-Sin Jhao2, Juan-Chen Huang3
    Structural Longevity, Vol.9, No.1, pp. 59-73, 2013, DOI:10.3970/sl.2013.009.059
    Abstract In this paper, the group preserving scheme (GPS) is adopted to simulate the dynamic ship maneuvering behaviors. According to the mathematical model of the maneuvering ship motion, ship dynamic behaviors are affected by the ship hull resistance, rudder and propulsive propeller forces, and main engine induced force; therefore, the conventional approach uses the high order time integration to simulate the ship dynamic behaviors and results in the numerical instability. Due to the characteristics of the cone structure, Lie-algebra, and group property of the GPS, this research introduces the non-linear GPS to simulate the dynamic ship behaviors. Through the group weighting… More >

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