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• W3152325955 startingPage "2437" @default.
• W3152325955 abstract "The influence of topography on sonic boom propagation is investigated. The full two-dimensional Euler equations in curvilinear coordinates are solved using high-order finite-difference time-domain techniques. Simple ground profiles, corresponding to a terrain depression, a hill, and a sinusoidal terrain, are examined for two sonic boom waves: a classical N-wave and a low-boom. Ground reflection of the sonic boom is affected by elevation variations: a concave ground profile induces compression, which tends to increase the peak pressure in particular, while the opposite is true for convex elevation variations, which lead to expansion and a reduction in peak pressure. The reflected boom is then strongly altered. Furthermore, a sufficiently concave topography can cause focal zones, which generate extra contributions at ground level in the form of U-waves in addition to the reflected wave. This mechanism has the largest effect on waveforms at ground level. The variations of standard metrics are of a few dBs compared to a flat ground for both sonic boom waves, and they are notably greater for the terrain depression than for the hill. Finally, in the case of a sinusoidal terrain, the pressure waveforms are composed of multiple arrivals due to successive focal zones." @default.
• W3152325955 created "2021-04-13" @default.
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• W3152325955 date "2021-04-01" @default.
• W3152325955 modified "2023-09-27" @default.
• W3152325955 title "Characterization of topographic effects on sonic boom reflection by resolution of the Euler equations" @default.
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• W3152325955 doi "https://doi.org/10.1121/10.0003816" @default.
• W3152325955 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33940888" @default.
• W3152325955 hasPublicationYear "2021" @default.
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