A numerical analysis of vortex growth in a two-dimensional jet

The vortex growth in a two-dimensional jet is simulated by solving numerically full Navier-Stokes equations with primitive variables. The streakline structures visualized with marker particles are well related to the fluctuations of velocity and pressure. The mechanism of vortex growth is also explained by using the visualized structure. The predicted features will agree with the experimental fact that, for example, the dominant frequency of fluctuation exists and the longitudinal velocity fluctuation along the jet axis increases exponentially in the zone of linear growth, while in the zone of non-linear growth the increasing rate decreases.