A Numerical Study on Flow Field around a Tidal-Jet-Generator Deliberating over Coastal Environmental Control

概要

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The 3D flow fields around a Tidal-Jet Generator (TJG) are investigated in a tide-like oscillating flow using a finite-difference numerical scheme, named NS-MAC-TIDE based on the fully 3D Navier-Stokes (NS) equations. The TJG is an enclosed rectangular breakwater, which has vertical opening and a large enclosed volume inside. During both phases of tide, strong and uni-directional jets can be obtained locally from the inlet of the TJG, due to the water level difference between the inner and outer sides of breakwater. The NS-MAC-TIDE model is applied to predict the maximum jet velocity at inlet and to reproduce the characteristics of flow field around a TJG. It is apparent that the present model can predict the maximum intensity of inlet velocity with high accuracy compared with the empirical function proposed from the experiments by Furukawa et al. (1994). It is also obvious that the numerical simulations can reproduce successfully the processes of generation, development and dissipation of tide-induced jets.
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