Aero-acoustics

Due to the nonlinearity of the governing equations it is very difficult to predict the sound production of fluid flows. This sound production occurs typically at high speed flows, for which nonlinear inertial terms in the equation of motion are much larger than the viscous terms (high Reynolds numbers). As sound production represents only a very minute fraction of the energy in the flow the direct prediction of sound generation is very difficult. This is particularly dramatic in free space and at low subsonic speeds. The fact that the sound field is in some sense a small perturbation of the flow can however, be used to obtain approximate solutions. Aero-acoustics provides such approximations and at the same time a definition of the acoustical field as an extrapolation of an ideal reference flow. The difference between the actual flow and the reference flow is identified as a source of sound. 

  • Computational Aero acoustics
  • Doppler effect
  • Aero-acoustic analogies
  • Curle’s formulation
  • Confined flows
  • Thermal Expansion and Thermal Stresses
  • Acoustic wave equations
  • Jet Aeroacoustics

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