1985 Volume 54 Issue 8 Pages 2840-2854
A two-dimensional high-Reynolds number flow is simulated starting from a high-symmetric random initial condition. At early stages of evolution narrow band regions of vorticity are built-up by stretching of equivorticity lines. They are broken down into a block of eddies of very complicated structure through a rolling-up instability and subsequent stretching and reconnection processes of equi-vorticity lines. Around this break-down time the enstrophy-dissipation rate takes the maximum value and the power form of the energy spectrum in the inertial range changes from k−4.2 to k−3.
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