COMPUTATIONAL STUDIES OF TURBULENT CROSS-FLOW JET USING LES

Abstract

The interaction between a turbulent jet and free stream flow is computationally studied using the large-eddy simulation (LES) approach. The effect of the blowing-ratio on the turbulent mixing is also subject of investigation in this research. The study revealed that the LES approach is suitable for the computation of highly-turbulent flows and able to capture all the flow structures of the jet in cross-flow. The analysis showed that the blowing-ratio is one of the parameters that control the turbulent mixing. Thus, the increase of the blowing-ratio causes a deeper penetration of the jet into the free stream flow and hence, an increased turbulent mixing. The interaction between the jet and free stream flow causes a sequence of vortex rings of different length-scales. Thus, larger vortex rings were observed for higher blowing –ratios. A concluding remarks of the present research is that high-turbulent mixing requires higher blowing-ratios.