Comparison of large-scale amplitude modulation in turbulent boundary layers, pipes, and channel flows
Romain Mathis, Jason P. Monty, Nicholas Hutchins, and Ivan Marusic
Spectrum of a passive scalar in moderate Reynolds number homogeneous isotropic turbulence
L. Danaila and R. A. Antonia
Stability of relative equilibria of three vortices
Hassan Aref
Three point vortices on the unbounded plane have relative equilibria wherein the vortices either form an equilateral triangle or are collinear. While the stability analysis of the equilateral triangle configurations is straightforward, that of the collinear relative equilibria is considerably more involved.This paper gives analysis based on explicit formulas for the three eigenvalues determining the stability, including a new formula for the angular velocity of rotation of a collinear relative equilibrium.
Fluctuations and stratification in sedimentation of dilute suspensions of spheres
Daniel Chehata Gómez, Laurence Bergougnoux, Élisabeth Guazzelli, and John Hinch
Whether stratification can control velocity fluctuations in suspensions of sedimenting spheres is tested. The initial value and early decay of the velocity fluctuations are not affected by stratification. On the other hand, in the descending front where the stratification is strong and well defined, the velocity fluctuations are inhibited according to a previously proposed scaling. In between, after the initial decay and before the arrival of the front, the local value of the stratification does not always play a role.
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