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Computing the far field scattered or radiated by objects inside layered fluid media using approximate Green's

Mario Zampolli1, Alessandra Tesei, Gaetano Canepa

  • 1NATO Undersea Research Centre, Viale San Bartolomeo 400, 19126 La Spezia, Italy.

The Journal of the Acoustical Society of America
|June 10, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces an efficient numerical method for calculating acoustic fields scattered by 3D objects in layered media. The technique simplifies calculations by using approximate formulas for Green's functions, enabling accurate acoustic field predictions.

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Area of Science:

  • Acoustics
  • Computational Physics
  • Wave Propagation

Background:

  • Calculating acoustic fields from objects in layered media is computationally intensive.
  • Existing methods often require complex numerical integration of Green's functions.
  • Accurate modeling is crucial for applications in underwater acoustics and geophysics.

Purpose of the Study:

  • To develop a numerically efficient technique for computing acoustic fields radiated or scattered by 3D objects in layered media.
  • To simplify the computation of Green's functions by avoiding full spectral integration.
  • To provide a flexible method applicable to objects located anywhere within or across fluid interfaces.

Main Methods:

  • Utilizes approximate formulas for Green's functions in layered media, expressed in elementary functions.
  • Requires surface pressure and normal particle displacement as input, obtainable through various means (analytical, numerical, experimental).
  • Avoids direct numerical integration of the full wave number spectral representation of Green's functions.

Main Results:

  • Presents a computationally efficient approach for acoustic field computation.
  • Demonstrates the method's validity through numerical examples.
  • Achieves accurate near-field pressure and particle displacement computations.

Conclusions:

  • The proposed technique offers a significant improvement in computational efficiency for acoustic scattering problems in layered media.
  • The method is versatile, handling objects at any position relative to interfaces.
  • Results are validated against established reference models, confirming accuracy.