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首页> 外文期刊>Journal of Fluids and Structures >Hydroelastic analysis of surface wave interaction with concentric porous and flexible cylinder systems
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Hydroelastic analysis of surface wave interaction with concentric porous and flexible cylinder systems

机译：同心多孔弹性圆柱体系统的表面波相互作用的水弹性分析

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The present study deals with the hydroelastic analysis of gravity wave interaction with concentric porous and flexible cylinder systems, in which the inner cylinder is rigid and the outer cylinder is porous and flexible. The problems are analyzed in finite water depth under the assumption of small amplitude water wave theory and structural response. The cylinder configurations in the present study are namely (a) surface-piercing truncated cylinders, (b) bottom-touching truncated cylinders and (c) complete submerged cylinders extended from free surface to bottom. As special cases of the concentric cylinder system, wave diffraction by (i) porous flexible cylinder and (ii) flexible floating cage with rigid bottom are analyzed. The scattering potentials are evaluated using Fourier-Bessel series expansion method and the least square approximation method. The convergence of the double series is tested numerically to determine the number of terms in the Fourier-Bessel series expansion. The effects of porosity and flexibility of the outer cylinder, in attenuating the hydrodynamic forces and dynamic overturning moments, are analyzed for various cylinder configurations and wave characteristics. A parametric study with respect to wave frequency, ratios of inner-to-outer cylinder radii, annular spacing between the two cylinders and porosities is done. In order to understand the flow distribution around the cylinders, contour plots are provided. The findings of the present study are likely to be of immense help in the design of various types of marine structures which can withstand the wave loads of varied nature in the marine environment. The theory can be easily extended to deal with a large class of problems associated with acoustic wave interaction with flexible porous structures.
机译：本研究涉及同心多孔和柔性圆柱体系统的重力波相互作用的水弹性分析，其中内圆柱体是刚性的，而外圆柱体是多孔且柔性的。在小振幅水波理论和结构响应的假设下，对有限水深中的问题进行了分析。本研究中的圆柱体配置为（a）穿刺截头圆柱体，（b）触底截头圆柱体，以及（c）从自由表面延伸到底部的完整浸没圆柱体。作为同心圆柱体系统的特殊情况，分析了（i）多孔柔性圆柱体和（ii）具有刚性底部的柔性浮子笼的波衍射。使用傅里叶-贝塞尔级数展开法和最小二乘近似法评估散射势。对双级数的收敛性进行数值测试，以确定傅里叶-贝塞尔级数展开式中的项数。针对各种气缸构造和波动特性，分析了外气缸的孔隙率和柔韧性对减弱流体动力和动态倾覆力矩的影响。进行了关于波频率，内外圆柱半径比，两个圆柱之间的环形间距以及孔隙率的参数研究。为了了解圆柱周围的流量分布，提供了等高线图。本研究的发现可能在设计各种类型的海洋结构方面具有巨大帮助，这些结构可以承受海洋环境中各种性质的波浪载荷。该理论可以轻松扩展，以解决与声波与柔性多孔结构相互作用有关的一类问题。

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