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Crater jet morphology
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DOI：10.1063/1.4943160.png)
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We present a detailed analysis of the morphology of craters induced by a round gas jet impinging vertically onto horizontal non-cohesive granular bed. The virtual origin of the jet from a self-similar model is taken into account both in the size scaling of the craters and in the inertial Shields number that governs the erosive processes. Two intrinsic types of craters with different morphologies are found and characterized in detail from shallow parabolic craters (type I) to deep conical craters (type II) whereas a flat central part arises from a finite bed thickness and leads to truncated morphologies. The transitions between the different crater morphologies are also analyzed in detail. The local Shields number based on the local velocity at the evolving bed surface is shown to depend on the local crater shape at the impinging point of the jet. (C) 2016 AIP Publishing LLC.
Keyword:
EROSION
SURFACE
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IF:
4.3
论文数:
2.9W
被引数:
8.0W
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