Large eddy simulation of compressible round jets with coflow

Large eddy simulations of subsonic round jets are carried out using high order compact finite difference scheme and an explicit filtering based approximate deconvolution method. The jets have a Mach number of 0.9 and Reynolds number of 4.5 x 10(5) based on jet diameter and centerline velocity at inflow. Results obtained for the mean flow and turbulence intensities agree well with those in existing literature. We also study the effects of co flow velocity ratio on the flow physics. Increase in potential core length and decrease in spreading rate of jet is observed in the presence of co-flow. The effects of co-flow velocity ratio on the axial Reynolds stress and turbulent kinetic energy budgets are also presented. It is observed that increasing co-flow velocity ratio leads to reduction in the turbulence intensities and near-field sound levels.

Automated summary

In this study, large eddy simulations of subsonic round jets were conducted using a high order compact finite difference scheme and an explicit filtering based approximate deconvolution method. The results obtained were in good agreement with existing literature, showing that the increase in co-flow velocity ratio leads to an increase in potential core length and a decrease in spreading rate of the jet, resulting in reduced turbulence intensities and near-field sound levels.