Prediction of Self-Sustained Oscillations of an Isothermal Impinging Slot Jet

The present results are focused on the self-sustained oscillations of a confined impinging slot jet and their role in flow structure modeling requirements. Unsteady laminar, large-eddy simulation (LES), Reynolds-averaged Navier–Stokes (RANS) predictions an isothermal were validated for several nozzle-to-plate ratios (H/B=4–15) laminar (Re=340 480) turbulent (Re=104–2.7×104) conditions. was found to be highly influenced by H/B ratio. For high (H/B>5), studied steady RANS turbulence models could not satisfactorily predict diffusion reported experimentally jet-impinging influence zone. failure these has been attributed issues closures. However, H/B=8, unsteady 3D LES calculations verified, sinuous oscillation mode developed, revealing display periodic flapping good agreement with experiments. predicted is one reasons higher near impingement wall, which verified time-averaged experimental studies. presence matters clarifying already long discussion model’s validation predicting jets ratios, adding justification models. This behavior correctly computed through LES.