LARGE EDDY SIMULATION OF NATURAL GRAVEL BED FLOW WITH WATER SURFACE FLUCTUATION IN SHALLOW WATER CONDITION

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Other Title
  • 浅水状態で水面変動のある自然礫床粗面乱流のLES解析

Abstract

Three dimensional open-channel turbulent flows with rough wall beds composed of randomly distributed gravel particles were simulated by using a large eddy simulation model for a relatively shallow water condition. The bathymetry of an actual rough bed was measured by a photogrammetric method and the digital data thus obtained was directly introduced into the LES. An immersed boundary method was incorporated to the model for reproducing such an arbitrary boundary condition. Experimental examinations were also conducted to evaluate the simulation. It was made clear that the correlation between water surface fluctuation and velocity fields become higher for larger Froude number. The effect of gravel size on the turbulent scale was revealed by comparing integral scale in different direction. In addition, a new method to visualize volume of fluids passing through a horizontal plane was devised to investigate large scale turbulence structures that interact with water surface.

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Details 詳細情報について

  • CRID
    1390001205352148096
  • NII Article ID
    130004558074
  • DOI
    10.2208/jscejhe.69.i_853
  • ISSN
    2185467X
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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