Sound Generation in the Interaction of Two Isentropic Vortices

Abstract

Through direct numerical simulation (DNS) for the sound generated by the interaction between two isentropic vortices, it is found that the interaction between two vortices with a large difference in their strengths or scales can generate continuous strong noise. The interaction between two isentropic vortices results in the formation of two vortex dipoles, with each vortex dipole containing two vortex cores. If there is a large difference in their initial strengths, there is a large difference in the strengths of the resulted vortex cores. As a result, the weaker vortex rotates around the stronger one continuously, which is the key source of the aerodynamic sound. This DNS result provides a new concept: the interactions among turbulent structures with large differences in their scales play a key role in the generation of turbulent noise.

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Document Details

Document Type
Technical Report
Publication Date
Feb 02, 2012
Accession Number
ADA557705

Entities

People

  • Chi-Wang Shu
  • Hanxin Zhang
  • Shuhai Zhang

Organizations

  • Brown University

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Aerodynamic Noise
  • Applied Mathematics
  • Demographic Cohorts
  • Electronic Mail
  • Equations
  • Euler Equations
  • Flow
  • Molecular Dynamics
  • Noise
  • Shock Waves
  • Simulations
  • Sound Pressure
  • Sound Waves
  • Turbulent Flow
  • Turbulent Mixing
  • Waves

Fields of Study

  • Physics

Readers

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