Self-sustained shock-wave oscillation mechanisms of transonic airfoil buffet

摘要

In this study, a buffet flow field obtained from the high fidelity wall-modeled large eddy simulation [1] is investigated to understand the self-sustained shock-wave oscillation mechanisms. Dominant phenomena in the transonic buffet are identified by the frequency weighted power spectrum density distribution. The fluctuations are decomposed into high- and low-frequency flow components, corresponding to high-frequency acoustic-wave-generation related physics and low-frequency shock-oscillation related breathing motion by phase-averaged operations. From the analysis, the buffet phenomena are simplified as based on the low-frequency breathing motion.