The Interaction of Shear Flows Generated by a Surface-Piercing Splitter Plate w/Free Surface

Abstract

An experimental study is performed in a water tunnel (Re = 40,000 to Re = 60,000) to study the interaction between the wake of a circular disk and the free surface. The deformation of the free surface is correlated with the behavior of the wake by utilizing surface pictures, wake flow visualization, drag measurement and Digital Particle Image Velocimetry techniques. It is observed that the wake can exist in two modes with different stabilities. The flow can switch between these two modes and the switching process exhibits hysteresis. The topological differences between these modes and their relation to the observed surface patterns are discussed. The changes in the wake are reflected by an increase in Cd which reaches a maximum value when the upper edge of the disk is 0.125 diameters from the surface. Comparison is also made with a disk approaching a solid boundary.

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Document Details

Document Type
Technical Report
Publication Date
Nov 26, 1997
Accession Number
ADA335279

Entities

People

  • Anatol Roshko
  • Morteza Gharib
  • Sid Valluri

Organizations

  • California Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundary Layer
  • Flow
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Froude Number
  • Geometry
  • Hydrodynamics
  • Jet Propulsion
  • Measurement
  • Physics Laboratories
  • Reynolds Number
  • Stagnation Point
  • Standing Waves
  • Stratified Fluids
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Image Processing and Computer Vision.
  • Marine Hydrodynamics
  • Structural Dynamics.