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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41339

Title: Effect of porosity on an internal solitary wave propagating over a porous trapezoidal obstacle
Authors: Ming-HungCheng Chih-MinHsieh John R.-C.Hsu Robert R.Hwang
Contributors: Ming-Hung Cheng;Chih-Min Hsieh;John R.-C. Hsu;Robert R. Hwang
Keywords: Internal solitary wave;RANS equation;k-ε turbulent model;Permeable obstacle
Date: 2017-01
Issue Date: 2017-02-14T07:18:41Z
Publisher: Ocean Engineering
Abstract: Abstract:A permeable seabed may influence the evolution of an internal solitary wave propagating on a continental shelf and nearshore. In order to study the porous effect, numerical simulations are performed to investigate the flow field and waveform inversion of a large depression ISW propagating over a porous trapezoidal obstacle. A finite volume based Cartesian grid method is adopted to solve the Reynolds averaged Navier-Stokes equations using a k-ε model for the turbulent closure and porous media model together. Numerical results reveal that waveform inversion weakens significantly, as the porosity of the obstacle increases, except when porosity nf<0.2. At the same time, the magnitude of vorticity and turbulent energy decrease remarkably due to acute reduction of the production term induced by percolation and wave-pore interaction. Moreover, a skewed hump shaped relation appears between the maximum vorticity and the porosity. For transmitted wave energy on a horizontal plateau, total energy may decrease as nf<0.2 but increases moderately while nf>0.2 during a strong wave-obstacle interaction.
Relation: 130(15),pp.126-141
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41339
Appears in Collections:[系統工程暨造船學系] 期刊論文

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