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- W2996695192 abstract "We analyze sound propagation in a waveguide filled with a random medium modeled by small-amplitude spatial and temporal fluctuations of the mass density and wave speed. The time dependence of the medium is due to a weakly turbulent flow. The analysis is based on a wave equation satisfied by the acoustic pressure, obtained by linearization of the fluid dynamic equations about the flow. The acoustic pressure is decomposed into modes, which are propagating and evanescent time-harmonic waves with amplitudes that are random fields. These amplitudes model the randomization of the sound wave due to cumulative scattering over a long distance of propagation in the random medium. We obtain a detailed statistical characterization of the mode amplitudes and use the results to solve two inverse problems: The first problem estimates the mean flow velocity from measurements of the acoustic pressure at one end of the waveguide. The second problem seeks to determine, from the same measurements, if the flow is laminar or if there is a region of turbulent flow." @default.
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- W2996695192 date "2019-01-01" @default.
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- W2996695192 title "Sound Propagation in a Weakly Turbulent Flow in a Waveguide" @default.
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