Large Scale Structures a Gradient Lines: the case of the Trkal Flow

Details Large Scale Structures a Gradient Lines: the case of the Trkal Flow Large Scale Structures a Gradient Lines: the case of the Trkal Flow

2010-07-13

arxiv.org/abs/1007.2079v1

Physics

Mathematical Physics

27 pages, 2 figures

Scientific paper

A specific asymptotic expansion at large Reynolds numbers (R)for the long wavelength perturbation of a non stationary anisotropic helical solution of the force less Navier-Stokes equations (Trkal solutions) is effectively constructed of the Beltrami type terms through multi scaling analysis. The asymptotic procedure is proved to be valid for one specific value of the scaling parameter,namely for the square root of the Reynolds number (R).As a result large scale structures arise as gradient lines of the energy determined by the initial conditions for two anisotropic Beltrami flows of the same helicity.The same intitial conditions determine the boundaries of the vortex-velocity tubes, containing both streamlines and vortex lines

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