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Full-waveform acoustic tomography for fluid temperature and flow.

Lennart Kira1, Jerome Noir1

  • 1Department of Earth and Planetary Sciences, ETH Zürich, Sonneggstrasse 5, 8090 Zurich, Switzerland.

Experiments in Fluids
|July 11, 2025
PubMed
Summary
This summary is machine-generated.

A new full-waveform inversion method enhances acoustic tomography for mapping temperature and flow fields in opaque fluids. This technique improves reconstructions in enclosed spaces and reduces measurement time, enabling new research possibilities.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Acoustics

Background:

  • Acoustic tomography reconstructs fluid properties using sound wave travel times.
  • Conventional methods struggle with reflections in enclosed spaces and require stationary flow assumptions.

Purpose of the Study:

  • Develop a full-waveform inversion (FWI) for acoustic tomography in laboratory settings.
  • Improve reconstruction accuracy and reduce acquisition time for opaque fluid flow analysis.

Main Methods:

  • Implemented FWI considering multiple reflected wave arrivals.
  • Benchmarked FWI against straight-ray algorithms using synthetic and experimental data.
  • Enabled simultaneous inversion of signals from multiple sources.

Main Results:

  • FWI enhances reconstruction quality, especially with sparse transducer arrays.
  • Simultaneous source inversion significantly decreases acquisition time.
  • The method effectively handles reflections in enclosed domains.

Conclusions:

  • Full-waveform inversion offers a robust solution for acoustic tomography in challenging environments.
  • This advancement is crucial for studying enclosed, opaque fluid flows where optical methods fail.
  • Potential applications include flow mapping around complex geometries and multiphase flows.