Abstract
This paper aims to investigate the fluid flow in a plane jet issuing into a counter uniform flow using direct numerical simulation of the Navier-Stokes equation. Numerical calculations were conducted for three cases of the velocity ratio of the jet to the counter flow. Cyclic oscillation of the jet reversed by the counter flow was visualized by the streamline and the vorticity contour. It was found that, as the velocity ratio increases, various oscillation modes emerge and the frequency of the fundamental oscillation decreases. An attempt to estimate the position of the instantaneous stagnation-point was made to show the periodic trajectory of the stagnation point while the reversed jet oscillates between the upper and lower sides of the nozzle.
