Non-linearities in the low-frequency dynamics of transitional shock wave boundary layer interactions

Large-eddy simulations (LES) of transitional shock wave boundary layer interactions (TrSBLIs) are carried out and results are compared with available experimental databases from the TFAST project. The separated region is characterised by low-frequency breathing and it is associated with a fluidic feedback originating from the vicinity of the reattachment point, in agreement with previous investigations. The non-linear spectral analysis reveled a quadratic coupling between the low--frequency feedback and the linear unstable modes developing within the mixing layer.