Density and surface tension effects on vortex stability. Part 1. Curvature instability
Density and surface tension effects on vortex stability. Part 1. Curvature instability
复制标题
密度和表面张力对涡流稳定性的影响。
DOI:
10.1017/jfm.2020.845
复制
发表时间:
2021
影响因子:
3.7
通讯作者:
Llewellyn Smith, Stefan G.
中科院分区:
文献类型:
--
作者:
Chang, Ching;Llewellyn Smith, Stefan G.
The curvature instability of thin vortex rings is a parametric instability discovered from short-wavelength analysis by Hattori & Fukumoto (Phys. Fluids, vol. 15, 2003, pp. 3151–3163). A full-wavelength analysis using normal modes then followed in Fukumoto & Hattori (J. Fluid Mech., vol. 526, 2005, pp. 77–115). The present work extends these results to the case with different densities inside and outside the vortex core in the presence of surface tension. The maximum growth rate and the instability half-bandwidth are calculated from the dispersion relation given by the resonance between two Kelvin waves of is the azimuthal wavenumber. The result shows that vortex rings are unstable to resonant waves in the presence of density and surface tension. The curvature instability for the principal modes is enhanced by density variations in the small axial wavenumber regime, while the asymptote for short wavelengths is close to the constant density case. The effect of surface tension is marginal. The growth rates of non-principal modes are also examined, and long waves are most unstable.
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DOI:
10.1098/rspa.1975.0183
发表时间:
1975-11
期刊:
Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
影响因子:
--
作者:
D. W. Moore;P. Saffman
通讯作者:
D. W. Moore;P. Saffman
DOI:
--
发表时间:
1992
期刊:
影响因子:
--
作者:
Nicholas R. Baumann;D. Joseph;P. Mohr;Y. Renardy
通讯作者:
Y. Renardy
影响因子:
3.7
作者:
R. A. Cairns
通讯作者:
R. A. Cairns
影响因子:
4.6
作者:
F. Waleffe
通讯作者:
F. Waleffe
影响因子:
3.7
作者:
F. J. Blanco;S. Le Dizès
通讯作者:
S. Le Dizès