Bubble Dynamics in a Turbulent Ship Wake

Abstract

A numerical model of the dynamics of the bubble distribution in a ship's wake is described. This wake is initiated by air entrained by the bow wave, the bilges, and the propeller. The present model is a finite volume formulation of the parabolic Navier-Stokes equations describing the hydrodynamic wake and the Garrettson equations describing bubble transport. The model is used to simulate the hydrodynamic and bubble wake found behind a twin screw ship 100 meters long. Both the initial hydrodynamic wake and bubble conditions were generated using empirical techniques. The model was used to predict bubble profiles for a range of bubble radius. In addition, a sensitivity analysis was used to determine the relative importance of each of the terms in the bubble transport equations. The dynamics of the smaller bubbles were dominated by turbulent diffusion and the bubble loss from gas diffusion.

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Document Details

Document Type
Technical Report
Publication Date
Nov 05, 1987
Accession Number
ADA187085

Entities

People

  • E. W. Miner
  • M. B. Stewart

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boltzmann Equation
  • Couplings
  • Differential Equations
  • Equations
  • Flow
  • Fluid Dynamics
  • Frequency
  • Mechanical Properties
  • Navier Stokes Equations
  • Physics Laboratories
  • Propellers
  • Reynolds Number
  • Scattering Cross Sections
  • Security
  • Stratified Fluids
  • Surface Chemistry
  • Turbulent Diffusion

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Aerodynamics.
  • Fluid Dynamics.