Computational study of velocity field of a counterflowing circular jet

Abstract

This paper treats the complex and very interesting “round jet in uniform counterflow stream” configuration which is known to enhance mixing and dispersion efficiency owing to flow reversal. The complexity of the problem originates from the interaction occurring between the jet and the counterflow. The interest of this configuration is essentially due to its presence in various applications (disposal of wastewater into seas or rivers, premixing fuel in aircraft engines, combustion, etc…) and in more than a field (industrial, environmental, chemical engineering, etc…). For the matter, a computational study of a turbulent circular jet discharging into a uniform counterflow is conducted in order to investigate the characteristics of the mean velocity field of the jet fluid. The investigation is carried out for three different cases of jet-to-current velocity ratios; low, median and high velocity ratios. The Reynolds Stress Model (RSM) is used in the comparison with available experimental measurements. The decay of the centerline velocity and the dynamic proprieties of the flow together with radial profiles of axial velocity are computationally analyzed in this paper.