The frequency properties and the typical flow features within the interaction zone in conical shock-wave/turbulent boundary-layer interactions (CSBLIs) are analyzed by performing proper orthogonal decomposition (POD) and dynamic mode decomposition (DMD) on a time-resolved direct numerical simulation database. The streamwise velocity and pressure fluctuations are processed according to their energy and frequency, respectively. As is the case of planar shock-wave/boundary-layer interactions, fluctuations in some bands of frequencies are more energetic downstream of the flow separation zone. The energetic low-frequency modes of the streamwise velocity fluctuations are reminiscent of Görtler-like vortices, whereas those of pressure fluctuations are connected with the “breathing” motion of the separation bubble. Higher-frequency modes, on the other hand, are related to wrinkling of the impinging conical shock. Although they bear resemblance with those in planar shock/turbulent boundary-layer interactions, it was found that the flow structures herein are less coherent owing to spanwise inhomogeneity of the impinging shock strength. The POD and DMD results of CSBLI support the notion that Görtler-like vortices might be an intrinsic mechanism of the interaction zone, which is probably responsible for the low-frequency unsteadiness of CSBLI. The present results may serve as a basic guidance for the design of fluidic control strategies of shock-induced flow separation.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Modal Analysis of Separation Bubble Unsteadiness in Conical Shock Wave/Turbulent Boundary Layer Interaction


    Contributors:

    Published in:

    AIAA Journal ; 60 , 9 ; 5123-5135


    Publication date :

    2022-05-10


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Modal Analysis of Cylinder-Induced Transitional Shock-Wave/Boundary-Layer Interaction Unsteadiness

    Hoffman, Eugene N. A. / Rodriguez, Jose M. / Cottier, Stephanie M. et al. | AIAA | 2021




    LOW-FREQUENCY UNSTEADINESS IN DSN OF SHOCK WAVE/TURBULENT BOUNDARY LAYER INTERACTION

    Priebe, S. / Martin, M. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2011


    Unsteadiness in shock wave boundary layer interactions with separation

    Dussauge, Jean-Paul / Dupont, Pierre / Debiève, Jean-François | Elsevier | 2005