Wave blocking and partial transmission in subcritical flows over an obstacle
| Autor: | Florent Michel, Renaud Parentani, Léo-Paul Euvé, Germain Rousseaux |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Physics
Nuclear and High Energy Physics business.industry Gravitational wave Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) Physics - Fluid Dynamics Measure (mathematics) General Relativity and Quantum Cosmology Computational physics symbols.namesake Optics Flow (mathematics) Transmission (telecommunications) Froude number symbols Transmission coefficient Center frequency business Hawking radiation |
| Zdroj: | Physical Review D. 91 |
| ISSN: | 1550-2368 1550-7998 |
| DOI: | 10.1103/physrevd.91.024020 |
| Popis: | We study and measure the transmission coefficient of counter-propagating shallow-water waves produced by a wave generator and scattered by an obstacle. To precisely compare theoretical predictions and experimental data, we consider $\sim 25$ frequencies for 5 subcritical background flows, where the maximum value of the Froude number ranges from $0.5$ to $0.75$. For each flow, the transmission coefficient displays a sharp transition separating total transmission from wave-blocking. Both the width and the central frequency of the transition are in good agreement with their theoretical values. The shape of the obstacle is identical to that used by the Vancouver team in the recent experiment aiming at detecting the analogue of stimulated Hawking radiation. Our results are compatible with the observations that have been reported. They complete them by establishing that the contribution of the transmission coefficient cannot be neglected for the lower half of the probed frequency range. 15 pages, 10 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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