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Adding thermal and granularity effects to the effective density fluid model.

Kevin L Williams¹

¹Applied Physics Laboratory, College of Ocean and Fishery Sciences, University of Washington, Seattle, Washington 98105, USA. williams@apl.washington.edu

The Journal of the Acoustical Society of America

|May 10, 2013

Summary

This summary is machine-generated.

This study enhances the effective density fluid model (EDFM) for granular sediments by incorporating heat transfer and granularity effects. The improved model accurately predicts sound speed and attenuation across a wide frequency range without free parameters.

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Area of Science:

Acoustics
Geophysics
Fluid Dynamics

Background:

The effective density fluid model (EDFM) previously modeled unconsolidated granular sediments.
The EDFM is a simplified version of the Biot porous media model.
Existing models may not fully capture complex acoustic behaviors in granular media.

Purpose of the Study:

To enhance the effective density fluid model (EDFM) by incorporating additional physical effects.
To investigate the impact of heat transfer and medium granularity on acoustic properties.
To validate the enhanced model against experimental ocean data.

Main Methods:

Analytical modeling incorporating low-frequency heat transfer and high-frequency granularity effects into the EDFM.
Derivation of expressions for sound speed and attenuation.
Comparison of model predictions with real-world ocean acoustic data.

Main Results:

The enhanced EDFM provides analytical expressions for sound speed and attenuation.
The model successfully incorporates heat transfer and granularity effects.
The derived expressions contain no adjustable or free parameters.
Model predictions show good agreement with ocean data.

Conclusions:

The enhanced EDFM offers a more comprehensive description of acoustic wave propagation in granular sediments.
The model's ability to predict acoustic properties without free parameters enhances its predictive power.
This improved model has significant implications for underwater acoustics and geophysical exploration.