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An integrated wave-effects model for an underwater explosion bubble.

Thomas L Geers1, Kendall S Hunter

  • 1Department of Mechanical Engineering, University of Colorado, Boulder 80309, USA. geers@spot.colorado.edu

The Journal of the Acoustical Society of America
|May 11, 2002
PubMed
Summary
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This study presents an improved model for underwater explosion bubbles, integrating shock wave and oscillation phases. The new model offers better agreement with experimental data for bubble motion prediction.

Area of Science:

  • Fluid dynamics
  • Acoustics
  • Underwater explosions

Background:

  • Underwater explosion bubbles exhibit complex dynamics involving shock waves and oscillations.
  • Previous models often struggle to accurately capture the entire bubble lifecycle.
  • Understanding bubble behavior is crucial for various applications, including naval engineering and seismic studies.

Purpose of the Study:

  • To develop a comprehensive model for underwater explosion bubbles.
  • To integrate the shock wave and oscillation phases into a unified framework.
  • To improve the accuracy of predicting bubble surface displacement and motion.

Main Methods:

  • Formulation of a hyperacoustic relationship linking bubble volume acceleration and far-field pressure.
  • Derivation of bubble-surface response equations incorporating wave effects in liquid and gas.

Related Experiment Videos

  • Specialization of equations for spherical bubble dynamics.
  • Calculation of bubble-surface displacement histories for dilational and translational motion.

    • Main Results:

    • The developed model successfully integrates shock wave and oscillation phases.
    • A hyperacoustic relationship was established for initial condition determination.
    • Wave effects were included in both external liquid and internal gas.
    • Calculated displacement histories showed significantly improved agreement with experimental data compared to prior models.

    Conclusions:

    • The integrated model provides a more accurate representation of underwater explosion bubble dynamics.
    • The hyperacoustic relationship effectively links shock wave characteristics to bubble oscillations.
    • The model's enhanced agreement with experimental data validates its predictive capabilities.