TY - JOUR
T1 - Computational aeroacoustics beneath high speed transitional and turbulent boundary layers
AU - Ritos, Konstantinos
AU - Drikakis, Dimitris
AU - Kokkinakis, Ioannis W.
AU - Spottswood, S. Michael
PY - 2020/5/15
Y1 - 2020/5/15
N2 - This paper concerns a study of pressure fluctuations beneath hypersonic shock-wave turbulent boundary layer interactions and the associated acoustic loading on a compression/expansion ramp. Using high-order methods, we have performed Direct Numerical Simulations at Mach 7.2. We compare the spectral analysis of the pressure fluctuations at various locations of the compression/expansion ramp with the spectra calculated beneath a hypersonic transitional boundary layer. Similarities and differences between the two hypersonic boundary layers, in the context of acoustic loading, are drawn. Extremely high values of pressure fluctuations are recorded after the shock re-attachment where we also observe the maximum pressure gradients indicating that acoustic loading is correlated with areas of high-pressure gradients. Finally, we discuss the impact of the boundary layer state (attached flow, turbulence bursts, recirculations, shock oscillations, shock re-attachment and expansion fans) on the frequency spectrum of the pressure fluctuations.
AB - This paper concerns a study of pressure fluctuations beneath hypersonic shock-wave turbulent boundary layer interactions and the associated acoustic loading on a compression/expansion ramp. Using high-order methods, we have performed Direct Numerical Simulations at Mach 7.2. We compare the spectral analysis of the pressure fluctuations at various locations of the compression/expansion ramp with the spectra calculated beneath a hypersonic transitional boundary layer. Similarities and differences between the two hypersonic boundary layers, in the context of acoustic loading, are drawn. Extremely high values of pressure fluctuations are recorded after the shock re-attachment where we also observe the maximum pressure gradients indicating that acoustic loading is correlated with areas of high-pressure gradients. Finally, we discuss the impact of the boundary layer state (attached flow, turbulence bursts, recirculations, shock oscillations, shock re-attachment and expansion fans) on the frequency spectrum of the pressure fluctuations.
KW - Aeroacoustics
KW - Compressible flow
KW - Direct numerical simulation
KW - Hypersonic flow
KW - Shock-boundary layer interaction
KW - Transition
KW - Turbulence
UR - http://www.scopus.com/inward/record.url?scp=85083593417&partnerID=8YFLogxK
U2 - 10.1016/j.compfluid.2020.104520
DO - 10.1016/j.compfluid.2020.104520
M3 - Article
AN - SCOPUS:85083593417
SN - 0045-7930
VL - 203
JO - Computers and Fluids
JF - Computers and Fluids
M1 - 104520
ER -