Incorporation of Atmospheric Flow Fields and Ground Interactions into Acoustic Finite-Difference, Time-Domain Simulations

By providing highly realistic simulations of sound propagation through complex atmospheric and terrain environments, finite-difference time-domain (FDTD) techniques can potentially reduce development time and improve the battlefield performance of acoustic sensors. In this paper, we summarize recent...

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Bibliographic Details
Main Authors: Wilson, D K, Marlin, David H, Collier, Sandra L, Symons, Neill P, Aldrige, David F, Ostashev, Vladimir E
Format: Report
Language:English
Subjects:
ACOUSTIC DETECTION
Acoustic Detection and Detectors
ALGORITHMS
BATTLEFIELD ENVIRONMENTS
COMPONENT REPORTS
EARTH SURFACE
EDDY CURRENTS
FINITE DIFFERENCE THEORY
FULL-FREQUENCY EQUATIONS
INHOMOGENOUS FLUID
MATHEMATICAL MODELS
Military Operations, Strategy and Tactics
PARALLEL PROCESSING
SOUND INTERACTIONS
SOUND TRANSMISSION
SYMPOSIA
TERRAIN
THERMAL PROPERTIES
TIME DOMAIN
TURBULENCE
WAVE PROPAGATION
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Summary:By providing highly realistic simulations of sound propagation through complex atmospheric and terrain environments, finite-difference time-domain (FDTD) techniques can potentially reduce development time and improve the battlefield performance of acoustic sensors. In this paper, we summarize recent progress in improving two key aspects of acoustic FDTD calculations for the atmosphere: (1) development of a rigorous implementation of sound propagation in a moving, inhomogeneous fluid, and (2) formulation and numerical implementation of time domain methods for handling sound interactions with partially reflecting ground surfaces. The new techniques are illustrated with highly detailed calculations of sound propagation through simulated, dynamic atmospheric turbulence fields and over a porous ground surface with viscous and thermal relaxation mechanisms. See also ADM001736, Proceedings for the Army Science Conference (24th) Held on 29 November-2 December 2004 in Orlando, Florida., The original document contains color images.