We study the evolution of single elliptic vortex ring for initial aspect ratio (AR) = 2, 4, 6. The incompressible Navier-Stokes equations are solved by a dealiased pseudo-spectral method with 64~3 grid points in a periodic cube. We find that there are three kinds of vortex motion as AR increases and vortex bifurcation occurs at a certain AR . the processes of advection, interaction, and decay of vortex ring are analyzed. Numeri- cal results coincide with experiments and other numerical simulations.
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