Direct Numerical Simulation of the Fully Developed Open-Channel Flow at Subcritical Froude Numbers

Abstract

Direct numerical simulation(DNS) of a fully-developed open- channel flow has been carried out for subcritical Froude numbers at a fixed friction-velocity Reynolds number of 180. The free surface is approximated by small-amplitude wave theory. The results are presented emphasizing the effects of the Froude number on turbulence quantities related to the free surface fluctuations. The amplitude of the free-surface fluctuation increases as the square of the Froude number. While statistical quantities involving the vertical velocity component are most influenced by the Froude number but only in the region close to the free surface, quantities related to the pressure fluctuations are influenced over much wider region.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2001
Accession Number
ADP013677

Entities

People

  • A. Nakayama
  • S. Yokojima

Organizations

  • Kobe University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Boltzmann Equation
  • Boundaries
  • Channel Flow
  • Computational Fluid Dynamics
  • Diffusion
  • Equations
  • Flow
  • Flow Fields
  • Froude Number
  • Reynolds Number
  • Simulations
  • Stresses
  • Surface Properties
  • Turbulence
  • Turbulent Diffusion
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Fluid Dynamics.