Incorporation of Atmospheric Flow Fields and Ground Interactions into Acoustic Finite-Difference, Time-Domain Simulations
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Pagination or Media Count:
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.
- Military Operations, Strategy and Tactics
- Acoustic Detection and Detectors