Bragg scattering by an irregular versatile seabed in the presence of current

IF 3.4 2区工程技术 Q1 ENGINEERING, MECHANICAL Journal of Fluids and Structures Pub Date : 2024-01-08 DOI:10.1016/j.jfluidstructs.2023.104059

Sagarika Khuntia , Smrutiranjan Mohapatra , Sanjay Kumar Mohanty

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Abstract

The Bragg scattering due to an undulated elastic bottom in the presence of a uniform current is discussed in the present paper. The conditions of Bragg resonance are derived analytically and discussed numerically for various values of physical parameters. The mathematical techniques used for discussing the analysis are the perturbation and Fourier transform methods. It is seen that the amplitude of the Bragg reflection increases with the increase in the flexibility factor in the versatile floor of the sea, and there is a significant impact of the current speed on Bragg reflection and transmission coefficients. The maximum value of the amplitude of Bragg reflection is observed to decrease as the Froude number increases. Again, it is seen that the transmitted energy produced in the presence of uniform current does not fluctuate considerably when the nature of an elastic bottom gets closer to that of a stiff floor. The blocking resonance in the presence of current and elastic bottom is analyzed by neglecting the small bottom undulation. A significant effect of blocking resonance on Bragg reflection and transmission is observed.

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不规则多变海床在海流作用下的布拉格散射

本文讨论了存在均匀电流的起伏弹性底部引起的布拉格散射。本文对不同物理参数值下的布拉格共振条件进行了分析推导和数值讨论。讨论分析所使用的数学方法是扰动法和傅立叶变换法。分析结果表明，布拉格反射的振幅随海底多变性柔性系数的增加而增大，流速对布拉格反射和透射系数也有显著影响。布拉格反射振幅的最大值随着弗劳德数的增加而减小。同样，当弹性底部的性质更接近于刚性地板时，在均匀电流的作用下产生的透射能量也不会大幅波动。通过忽略小的底部起伏，分析了电流和弹性底部存在时的阻塞共振。观察到阻塞共振对布拉格反射和透射的重要影响。

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来源期刊

Journal of Fluids and Structures 工程技术-工程：机械

CiteScore

6.90

自引率

8.30%

发文量

173

审稿时长

65 days

期刊介绍： The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.