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Sonic boom reflection over an isolated building and multiple buildings.

Didier Dragna1, Ariane Emmanuelli1, Sébastien Ollivier1

  • 1Univ Lyon, Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard Lyon I, CNRS, Laboratoire de Mécanique des Fluides et d'Acoustique, UMR 5509, 36 Avenue Guy de Collongue, F-69134, Ecully, France.

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Sonic boom reflection over buildings creates distinct pressure waves and noise. Numerical simulations show that urban geometry significantly impacts sonic boom propagation and perceived noise levels, especially in street canyons.

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Area of Science:

  • Acoustics
  • Computational Fluid Dynamics
  • Urban Aerodynamics

Background:

  • Sonic booms generated by supersonic aircraft can cause noise pollution.
  • Understanding sonic boom propagation in urban environments is crucial for mitigating noise impacts.

Purpose of the Study:

  • To investigate sonic boom reflection and propagation over isolated and multiple buildings.
  • To analyze the effects of urban geometry on sonic boom waveforms and perceived noise.

Main Methods:

  • Numerical simulations using high-order finite-difference techniques to solve two-dimensional Euler equations.
  • Analysis of pressure waveforms and perceived noise for different urban geometries (isolated building, two buildings, periodic buildings).
  • Consideration of two sonic boom waves: classical N-wave and low-boom wave.

Main Results:

  • Building influence creates illuminated and shadow regions, dependent on building height and Mach number.
  • Low-frequency oscillations and resonances occur in street canyons, influenced by street width and boom frequency.
  • Waveform duration increases with multiple buildings due to diffraction and canyon resonances.

Conclusions:

  • Urban geometry significantly alters sonic boom characteristics, affecting pressure waveforms and noise perception.
  • Low-frequency oscillations in street canyons have minimal impact on perceived noise despite their amplitude.
  • Noise variations are moderate in wide streets but become noticeable in narrower urban canyons.