Finite Difference Time Domain Method for Acoustic Waves in Attenuate and Absorptive Medium For Layered Underwater Acoustic Environments
In this work, the authors use Finite Difference Time Domain (FDTD) method to investigate the underwater acoustic wave propagation problem; in order to understand the acoustic wave propagation properties and determining the effects of the attenuation and absorption for the sound intensity in the sea. The results are presented for calculated Transmission Loss (TL) of propagating acoustic waves in layered underwater acoustic environments by using FDTD method. In a first step; the sea environment are modeled as one layered medium before generalizing the resolution to two layered (fluid-fluid and fluid-solid) medium. The sea surface and the sea bottom are considered to be planar surfaces. The discretized acoustic wave equations are used in the algorithm of the FDTD method and Perfectly Matched Layer absorbing boundary condition is applied to eliminate numerical reflections from the ends of the grid .Two cases are discussed (Taking account of absorption and attenuation).The good performance of this method is validated with the results of BELHOP program and by comparison with the analytical method. In this work, the authors use Finite Difference Time Domain (FDTD) method to investigate the underwater acoustic wave propagation problem; in order to understand the acoustic wave propagation properties and determining the effects of the attenuation and absorption for the sound intensity in the sea. The results are presented for calculated Transmission Loss (TL) of propagating acoustic waves in layered underwater acoustic environments by using Finite (FDTD) method. In a first step; the sea environment are modeled as one layered medium before generalizing the resolution to two layered (fluid-fluid and fluid-solid) medium. The sea surface and the sea bottom are considered to be planar surfaces. The discretized acoustic wave equations are used in the algorithm of the FDTD method and Perfectly Matched Layer absorbing boundary condition is applied to eliminate numerical reflections from the ends of the grid. Two cases are discussed (Taking account of absorption and attenuation).The good performance of this method is validated with the results of BELHOP program and by comparison with the analytical method.
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Availability:
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Authors:
- Lakziz, Jawad
- Otmane, Sofiane
- Ouaskit, Said
- El Guerjouma, Rachid
- Publication Date: 2014
Language
- English
Media Info
- Media Type: Web
- Features: Figures; References;
- Pagination: pp 47-54
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Serial:
- Journal of Marine Technology and Environment
- Volume: 2
- Publisher: Constanta Maritime University
- ISSN: 1844-6116
- Serial URL: http://www2.cmu-edu.eu/jmte
Subject/Index Terms
- TRT Terms: Absorption; Acoustics; Finite differences; Sound attenuation; Time domain analysis; Transmission loss; Underwater sound; Wave motion
- Subject Areas: Environment; Marine Transportation; I15: Environment;
Filing Info
- Accession Number: 01558853
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 31 2015 9:06AM