Numerical Studies of Turbulent Free Surface Flows and Unsteady Propeller Flows.

Abstract

Two main problems have been studied, viz. the structure of turbulence near a free surface and the Reynolds-averaged solution of unsteady propeller/hydrofoil flows by the renormalization group (RNG) two-equation turbulence transport model. A variety of free-surface turbulence simulations demonstrate the key modifications in turbulence structure due to the free surface. In addition, we determine the modifications in surface wave spectra due to the turbulence beneath the free surface as typically represented by a renormalized dispersion relation. The results for unsteady hydrofoils show the power of the RNO method in robustly and accurately treating large-scale unsteady and transitional flows, a marked improvement over previous turbulence transport models. (AN)

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Document Details

Document Type
Technical Report
Publication Date
Mar 31, 1995
Accession Number
ADA294377

Entities

People

  • Ilya Staroselsky
  • Steven A. Orszag
  • Vadim Borue
  • Yansi Zhang

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Differential Equations
  • Dispersion Relations
  • Equations Of Motion
  • Experimental Data
  • Fluid Flow
  • Froude Number
  • Hydrodynamics
  • Large Eddy Simulation
  • Navier Stokes Equations
  • Partial Differential Equations
  • Pressure Measurement
  • Skin Friction
  • Stratified Fluids
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Fluid Mechanics and Fluid Dynamics.