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  • Open Access


    Geometrically Nonlinear Flutter Analysis Based on CFD/CSD Methods and Wind Tunnel Experimental Verification

    Changrong Zhang, Hongtao Guo, Li Yu, Binbin Lv, Hongya Xia*

    CMES-Computer Modeling in Engineering & Sciences, Vol.136, No.2, pp. 1743-1758, 2023, DOI:10.32604/cmes.2023.025528

    Abstract This study presents a high-speed geometrically nonlinear flutter analysis calculation method based on the high-precision computational fluid dynamics/computational structural dynamics methods. In the proposed method, the aerodynamic simulation was conducted based on computational fluid dynamics, and the structural model was established using the nonlinear finite element model and tangential stiffness matrix. First, the equilibrium position was obtained using the nonlinear static aeroelastic iteration. Second, the structural modal under a steady aerodynamic load was extracted. Finally, the generalized displacement time curve was obtained by coupling the unsteady aerodynamics and linearized structure motion equations. Moreover, if the flutter is not at a… More > Graphic Abstract

    Geometrically Nonlinear Flutter Analysis Based on CFD/CSD Methods and Wind Tunnel Experimental Verification

  • Open Access


    Optimization of the Air Deck Blasting Parameters on the Basis of the Holmquist-Johnson-Cook Constitutive Model

    Zuoming Yin1,*, Xuguang Wang2, Desheng Wang1, Zhiheng Dang1, Jianfeng Shao3

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.2, pp. 257-269, 2022, DOI:10.32604/fdmp.2022.017915

    Abstract The present study considers the so-called air deck blasting, one of the most commonly used techniques for the improvement of blasting efficiency in mining applications. In particular, it aims to improve the operating conditions of large-scale equipment, increase the efficiency of the slope enlarging process, and reduce the mining cost. These objectives are implemented through a two-fold approach where, first, a program for slope enlarging based on the middle air-deck charge blasting-loosening technology is proposed, and second, the physical mechanism responsible for the stress wave attenuation in the rock is analyzed in the framework of a Holmquist–Johnson–Cook constitutive model. Field… More >

  • Open Access


    An Experimental and Numerical Study on the Cleaning of Pleated Bag Filters Using Low-Pressure Pulsed-Jets

    Lumin Chen1, Wanying Sun2, Fuping Qian1,*, Can Fang2, Zhimin Zheng1, Qianshuang Zhuang3, Yunlong Han2, Jinli Lu2

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.1, pp. 41-56, 2022, DOI:10.32604/fdmp.2022.017523

    Abstract Pulsed-jet cleaning is recognized as the most efficient method to regenerate bag dust collectors traditionally used in industrial processes to control the emission of particulates. In this study, non-woven needle felt filter bags with and without a film coating material have been analyzed considering different geometries (different number N of pairs of pleated filter bag sides) in the frame of dedicated low-pressure pulsed-jet cleaning experiments. The flow structure inside the bag and the response characteristics of its wall have also been analyzed numerically through a computational fluid-dynamics/structural-dynamics (CFD-CSD) unidirectional fluid-solid coupling method. As shown by the experiments, the peak pressure… More >

  • Open Access


    A Novel Approach for the Numerical Simulation of Fluid-Structure Interaction Problems in the Presence of Debris

    Miaomiao Ren*, Xiaobin Shu

    FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.5, pp. 979-991, 2020, DOI:10.32604/fdmp.2020.09563

    Abstract A novel algorithm is proposed for the simulation of fluid-structure interaction problems. In particular, much attention is paid to natural phenomena such as debris flow. The fluid part (debris flow fluid) is simulated in the framework of the smoothed particle hydrodynamics (SPH) approach, while the solid part (downstream obstacles) is treated using the finite element method (FEM). Fluid-structure coupling is implemented through dynamic boundary conditions. In particular, the software “TensorFlow” and an algorithm based on Python are combined to conduct the required calculations. The simulation results show that the dynamics of viscous and non-viscous debris flows can be extremely different… More >

  • Open Access


    Effect of the Wall Thickness of the Vessel on FFRCT of Carotid Artery Stenosis

    Long Yu1, Kesong Xu1, Jun Wan2, Haiyan Lu3,*, Shengzhang Wang1,*

    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.3, pp. 835-844, 2019, DOI:10.32604/cmes.2019.07428

    Abstract Fractional flow reserve (FFR) computed from computed tomography angiography (CTA), i.e., FFRCT has been used in the clinic as a noninvasive parameter for functional assessment of coronary artery stenosis. It has also been suggested to be used in the assessment of carotid artery stenosis. The wall thickness of the vessel is an important parameter when establishing a fluid-structure coupling model of carotid stenosis. This work studies the effect of the vessel wall thickness on hemodynamic parameters such as FFRCT in carotid stenosis. Models of carotid stenosis are established based on CTA image data using computer-aided design software. It is assumed… More >

  • Open Access


    BEM-FEM Coupling For Acoustic Effects On Aeroelastic Stability Of Structures

    Harijono Djojodihardjo1, Irtan Safari2

    CMES-Computer Modeling in Engineering & Sciences, Vol.91, No.3, pp. 205-234, 2013, DOI:10.3970/cmes.2013.091.205

    Abstract A series of work has been carried out to develop the foundation for the computational scheme for the calculation of the influence of the acoustic disturbance to the aeroelastic stability of the structure. The generic approach consists of three parts. The first is the formulation of the acoustic wave propagation governed by the Helmholtz equation by using boundary element approach, which then allows the calculation of the acoustic pressure on the acoustic-structure boundaries. The structural dynamic problem is formulated using finite element approach. The third part involves the calculation of the unsteady aerodynamics loading on the structure using generic unsteady… More >

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