Abstract Shock wave/turbulent boundary layer interaction (SBLI) on flat plate is investigated with different added periodic disturbances via large eddy simulation. Turbulence analysis of boundary layer and SBLI flow field are compared among different cases. It is found that disturbances have little impact on characteristics of the viscous layer. The amplifications of turbulent kinetic energy on logarithmic layer and outer layer are further strengthened with shock wave/turbulent boundary layer interaction. Distributions of skin frictions reveal that the separation bubble shrinks under effect of disturbances. Despite the obvious reduction of the separation bubble by disturbances, the streamwise scale in instantaneous slices does not follow the same pattern, owing to the phase discrepancy of different frequencies. The flow field of shock wave/turbulent boundary layer interaction is spatially and temporally influenced by the propagation of disturbances. As a result, the oscillation of the separation bubble and separation shock is reinforced. Conclusion is verified through the analysis of power spectral density that disturbances do not affect the viscous layer despite the frequency. However, disturbances make substantial difference to low-frequency signals, corresponding to the large-scale motion in the outer layer.
Highlights Velocity profiles keep nearly steady under influence of inflow periodic velocity disturbances. Separation is weakened by disturbances, owing to change of streamwise Reynolds stresses. Separation bubble shrinks with disturbance frequency going down. Shock wave/turbulent boundary layer flow field is influenced spatially and temporally. Large-scale motion is substantially strengthened by inflow disturbances.
Impacts of periodic disturbances on shock wave/turbulent boundary layer interaction
Acta Astronautica ; 182 ; 230-239
2021-02-14
10 pages
Article (Journal)
Electronic Resource
English
Shock wave/turbulent boundary layer interaction , Periodic disturbances , Large eddy simulation , Separation bubble , LES , large eddy simulation , N–S , Navier-Stokes , PSD , power spectral density , RMS , root mean square , SBLI , shock wave/turbulent boundary layer interaction , TBL , turbulent boundary layer , TKE , turbulent kinetic energy
Asymmetric Crossing-Shock-Wave-Turbulent-Boundary-Layer Interaction
Online Contents | 1995
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