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movie_2vx3d_fix_l1.5.
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Nonlinear dynamics of the elliptic instability - movie 2
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posted on 2017-01-18, 10:01
authored by
Nathanael Schaeffer
Nathanael Schaeffer
,
Stéphane Le Dizès
Movie 2. Strongly non-linear evolution of the elliptic instability of a counter-rotating Lamb-Oseen vortex pair (case 2) of core size a separated by a distance b/a=5 and for Reynolds number Re=Γ/ν=6300 (where Γ is the vortex circulation, ν the kinematic viscosity of the fluid). On this movie, the elliptic instability follows the same evolution as in movie 1 : deformation of the vortex cores, formation of azimuthal structures and finally breakdown. By the end of the movie, one can also see some structures wrapping around both vortices. The total vorticity is equal to 1.5 on the red surface, and the current time t is given in the top right corner in initial vortex turnover time units. See also fig. 8 in the paper.
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Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics)
Fluid mechanics and thermal engineering not elsewhere classified
Keywords
elliptic instability
vortex
non-linear
saturation
Computational Fluid Dynamics
Fluid Physics
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CC BY 4.0
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