Propagation of water waves over permeable rippled beds

Ching Jer Huang, Chih Hsin Chen, Hsing Han Chang

研究成果: Article同行評審

9 引文 斯高帕斯(Scopus)

摘要

Unsteady two-dimensional NavierStokes equations and NavierStokes type model equations for porous flow were solved numerically to simulate the propagation of water waves over a permeable rippled bed. A boundary-fitted coordinate system was adopted to make the computational meshes consistent with the rippled bed. The accuracy of the numerical scheme was confirmed by comparing the numerical results concerning the spatial distribution of wave amplitudes over impermeable and permeable rippled beds with the analytical solutions. For periodic incident waves, the flow field over the wavy wall is discussed in terms of the steady Eulerian streaming velocity. The trajectories of the fluid particles that are initially located close to the ripples were also determined. One of the main results herein is that under the action of periodic water waves, fluid particles on an impermeable rippled bed initially moved back and forth around the ripple crest, with increasing vertical distance from the rippled wall. After one or two wave periods, they are then lifted towards the next ripple crest. All of the marked particles on a permeable rippled bed were shifted onshore with a much larger displacement than those on an impermeable bed. Finally, the flow fields and the particle motions close to impermeable and permeable beds induced by a solitary wave are elucidated.

原文English
頁(從 - 到)579-591
頁數13
期刊Ocean Engineering
38
發行號4
DOIs
出版狀態Published - 2011 三月 1

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Ocean Engineering

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