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The present work studied various models for predicting turbulence in theproblem of injecting a fluid microjet into the boundary layer of a turbulentflow. For this purpose, the one-equation Spalart-Allmaras (SA), two-equationk-$\epsilon$ and k-$\omega$, multi-equation transition k-kL-$\omega$,transition shear stress transport (SST), and Reynolds stress models were usedfor solving the steady flow. Moreover, the transition SST, scale-adaptivesimulation (SAS), and detached eddy simulation (DES) models were used for thetransient flow. A comparison of the results indicated that the steady solutionmethods performed sufficiently well for this problem. Furthermore, it was foundthat the four-equation transition SST model was the most accurate method forthe prediction of turbulence in this problem. This model predicted the velocityalong the x-axis in near- and far-jet locations with about 1% and 5% errors,respectively. It also outperformed the other methods in predicting Reynoldsstresses, especially at the center (with an about 5% error).

A Comparison of Various Turbulence Models for Analysis of Fluid Microjet Injection into the Boundary Layer over a Flat Surface