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Wave Patterns of Gravity-Capillary Waves from Moving Localized Sources
Version 1
: Received: 2 November 2020 / Approved: 4 November 2020 / Online: 4 November 2020 (10:04:41 CET)
A peer-reviewed article of this Preprint also exists.
Gnevyshev, V.; Badulin, S. Wave Patterns of Gravity–Capillary Waves from Moving Localized Sources. Fluids 2020, 5, 219. Gnevyshev, V.; Badulin, S. Wave Patterns of Gravity–Capillary Waves from Moving Localized Sources. Fluids 2020, 5, 219.
Abstract
We study wave patterns of gravity-capillary waves from moving localized sources within the classic setup of the problem of ship wakes. The focus is made on the co-existence of two wave systems with opposite signatures of group velocity relative to the localized source. It leads to the problem of choice of signs for phase functions of the gravity (“slow”) and capillary (“fast”) branches of the dispersion relation: the question generally ignored when constructing phase patterns of the solutions. We detail characteristic angles of the wake patterns: (i) angle of demarcation of gravity and capillary waves – “the phase Mach” cone, (ii) angle of the minimal group velocity of gravity-capillary waves – “the group Mach” cone, (iii, iv) angles of cusps of isophases that appear after a threshold current speed. The outer cusp cone is naturally associated with the classic cone of Kelvin for pure gravity waves. The inner one results from the effect of capillarity and tends to the “group Mach” pattern at high speeds of current. Amplitudes of the wave patterns are estimated within the recently proposed approach of reference functions for the problem of propagation of packets of linear dispersive waves. The effect of shape is discussed for elliptic reference sources.
Keywords
gravity-capillary waves; ship wake; Kelvin angle, reference solutions
Subject
Physical Sciences, Acoustics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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