Analysis of Dominant Terms in Reynolds-Stress Budgets for a Hot Free Subsonic Jet Using Large-Eddy Simulation
Résumé
Bridges reference hot subsonic jet is simulated using a Reynolds Stress Model. The obtained results confirm that this approach, even if sophisticated, is not satisfactory and it requires extra-modelling efforts. Then, a LES is set up to compute the Reynolds Stress budgets. The LES is first validated by comparing average fields obtained with that measured by Bridges. Since the differences are small, the terms making up the Reynolds stress balance are computed from processing the archived unsteady quantities. The two main regions studied are the potential area and the self-similar area. The results show a dominance of production and pressure strain correlation terms close to the convergent nozzle exit. In the self-similar area, turbulent diffusion and dissipation become significant, and the convection term becomes non-negligible. On the other hand, pressure and viscous diffusion terms remain negligible far from the walls. These results emphasize the importance of accurately modelling the redistribution term.
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