On wall pressure fluctuations in conical shock wave/turbulent boundary layer interaction
نویسندگان
چکیده
The structure and the frequency spectra of wall pressure fluctuations beneath a planar turbulent boundary layer interacting with conical shock wave at Mach number $M_\infty =2.05$ Reynolds $\textit {Re}_\theta \approx 630$ (based on upstream momentum thickness) are examined to elucidate effects gradient flow separation characteristics fluctuations, by exploiting direct numerical simulation database. Upstream interaction, in zero region, statistics compare well canonical compressible layers terms fluctuation intensities spectra. Across main interaction zone (APG1), root-mean-square becomes very large (corresponding approximately 173.3 dB), maximum increase 12.7 dB from incoming level. In second adverse (APG2), attains peak $164.7$ an 8.4 Both APG1 APG2 regions feature substantial fraction reversal events, which are, however, scattered interspersed attached flow. power spectral density exhibits broadband energetic low-frequency component associated global unsteadiness bubble/conical system. Analysis two-point correlations wavenumber/frequency further suggests that typical eddies become more elongated along spanwise direction, as separated region tends escape centreline, convection velocity is significantly reduced.
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2023
ISSN: ['0022-1120', '1469-7645']
DOI: https://doi.org/10.1017/jfm.2023.480