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Numerical Comparison for Focused Wave Propagation Between the Fully Nonlinear Potential flow and the viscous fluid flow Models

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China Ocean Engineering 2020年第2期34卷 279-288页

作者： JIANG Sheng-chao LIU Chang-feng SUN Lei School of Naval Architecture State Key Laboratory of Structural Analysis for Industrial EquipmentDalian University of TechnologyDalian 116024China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China College of Ocean and Civil Engineering Dalian Ocean UniversityDalian 116023China

Numerical simulations on focused wave propagation are carried out by using three types of numerical models,including the linear potential flow,the nonlinear potential flow and the viscous fluid flow *** wave-wave interaction of the focused wave group with different frequency bands and input wave amplitudes is examined,by which the influence of free surface nonlinearity and fluid viscosity on the related phenomenon of focused wave is *** significant influence of free surface nonlinearity on the characteristics of focused wave can be observed,including the increased focused wave crest,delayed focused time and downstream shift of focused position with the increase of input *** can plot the evident difference between the results of the nonlinear potential flow and linear potential flow ***,only a little discrepancy between the nonlinear potential flow and viscous fluid flow models can be observed,implying the insignificant effect of fluid viscosity on focused wave ***,the nonlinear potential flow model is recommended for simulating the non-breaking focused wave problem in this study.

关键词： focused wave linear potential flow fully nonlinear potential flow viscous fluid flow boundary element method OpenFOAM

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Vibration analysis of fluid-conveying multi-scale hybrid nanocomposite shells with respect to agglomeration of nanofillers

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Defence Technology（防务技术） 2021年第1期17卷 212-225页

作者： Farzad Ebrahimi Ali Dabbagh Department of Mechanical Engineering Faculty of EngineeringImam Khomeini International UniversityQazvinIran School of Mechanical Engineering College of EngineeringUniversity of TehranTehranIran

The vibration problem of a fluid conveying cylindrical shell consisted of newly developed multi-scale hybrid nanocomposites is solved in the present manuscript within the framework of an analytical *** consistent material is considered to be made from an initial matrix strengthened via both macro-and nano-scale *** influence of nanofillers’agglomeration,generated due to the high surface to volume ratio in nanostructures,is included by implementing Eshelby-Mori-Tanaka homogenization ***,the equivalent material properties of the carbon nanotube reinforced(CNTR)nanocomposite are coupled with those of CFs within the framework of a modified rule of *** the other hand,the influences of viscous flow are covered by extending the Navier-Stokes equation for cylinders.A cylindrical coordinate system is chosen and mixed with the infinitesimal strains of first-order shear deformation theory of shells to obtain the motion equations on the basis of the dynamic form of principle of virtual ***,the achieved governing equations will be solved by Galerkin’s method to reach the natural frequency of the structure for both simply supported and clamped boundary *** a set of illustrations,effects of each parameter on the dimensionless frequency of nanocomposite shells will be shown graphically.

关键词： Vibration Agglomeration effect Multi-scale hybrid nanocomposites Galerkin’s solution viscous fluid flow

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