Interference of sound waves in a moving fluid

We investigate sound propagation in a moving fluid confined in a randomly corrugated tube. For weak randomness and small fluid velocities $v^{(0)}$, the localization length $ξ$ shows extreme sensitivity to the variation of $v^{(0)}$. In the opposite limit of large fluid velocities, $ξ$ acquires a constant value which is independent of the frequency of the incident sound wave, the degree of randomness and $v^{(0)}$ itself. Finally, we find that the standard deviation $σ_{\ln T}$ of the logarithm of transmittance $\ln(T)$ is a universal function of the ensemble average $\langle \ln T\rangle$, which is not affected by the fluid velocity.

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