Spectrum asymptotics of high-frequency acoustic emission generated by surface explosion

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The problem of high-frequency acoustic emission generated by an underwater explosion at the free surface of inviscid liquid is considered. Flow is assumed to be irrotational that allows an approximate equation of motion for the boundary of expanding breakdown to be constructed in analogy to the Rayleigh equation for a spherical bubble. The surface of the cavity (having the "bowl"-like form) is replaced by the circular cylinder whose height is equal to its diameter. The simple solution is obtained if the adiabatic exponent is taken equal to 1.2. It is shown that, in the first approximation, the spectral density of an acoustic energy emitted by surface explosion varies as the minus 1.1 power of the frequency and decreases approximately by 3.3 decibels per octave. Such slow decrease of the spectral density versus the frequency is the consequence of accepted assumption about the existence of potential flow after an energy deposition.

Original languageEnglish
Pages (from-to)1508-1512
Number of pages5
JournalPhysics of Fluids
Issue number5
StatePublished - 1 Jan 2001

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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