{'fraction_non_alphanumeric': 0.01348747591522158, 'fraction_numerical': 0.0, 'mean_word_length': 5.5, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Evolution of Wave Packets in a Laminar Separation Bubble

Wave packets of time-harmonic disturbances in a laminar separated flow behind a backward-facing step on flat plate are investigated. Experimental data are obtained through hot-wire measurements in a low-turbulent subsonic wind tunnel. The results show that the oscillations generated locally in the separation region are transported upstream which makes an essential difference between the separation bubble under self-excitation and the attached boundary layer