Turbulent Spot/Separation Bubble Interactions in a Spatially Evolving Supersonic Boundary-Layer Flow

Abstract

The growth and breakdown of localized disturbances into a turbulent spot in a Mach 2 boundary-layer flow were investigated using direct numerical simulation. In particular, the interaction of a turbulent spot with a shock-induced separation bubble was studied. The primary vortex structures triggered by the injected low momentum fluid and the metamorphosis of the hairpin structures into a turbulent spot were clearly identified in the study. The spot-separation bubble interaction was found to enhance the breakdown of the hairpin structures (i.e., is capable of advancing the transition process). A substantial increase in the lateral spreading of the spot was observed due to the spot/bubble interaction. Locally averaged profiles of the flow quantities within the spot showed behavior similar to developed turbulent flows.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2004
Accession Number
ADA442178

Entities

People

  • L. Krishnan
  • N. D. Sandham

Organizations

  • University of Southampton

Tags

Communities of Interest

  • Air Platforms
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Base Flow
  • Boundaries
  • Boundary Layer
  • Boundary Layer Flow
  • Boundary Layer Transition
  • Computational Fluid Dynamics
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Incompressible Flow
  • Layers
  • Mach Number
  • Physics
  • Pressure Gradients
  • Skin Friction
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Underwater engineering and Marine Technology.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers