Abstract Shockwave/turbulent boundary layer interaction on flat plate are investigated by using direct numerical simulation at different wall temperature of T w / T r = 0.5 , 1.0 , 2.0 respectively. Responses of skin friction, velocity profile and root mean square velocity profile are examined. Analysis on velocity profiles indicate that streamwise velocity in the outer part of boundary layer experiences a reduction with wall temperature going up. Skin friction decreases while wall is heating mainly caused by a lower velocity gradient near the wall at a high temperature. A lower skin friction on high wall temperature results in a stronger separation. The comparison of root mean square velocity profile shows turbulent kinetic energy is augmented on a heating wall. The maximum value moves closer to the wall with wall temperature increasing. The scale of separation bubble is amplified with wall temperature increasing. Near-wall streaks become unstable and get an increment in spanwise distance. The process of near-wall strip vortices evolving to complicated 3-dimonsional structures is accelerated and amplified in a high wall temperature. Counter-rotating vortex in reattachment process is evaluated in the three cases. The scale of such vortex gets larger when wall temperature gets higher. The spanwise distance between counter-rotating vortices rises obviously and break down to smaller coherent structures quicker.

    Highlights Skin friction goes down with wall temperature increasing. Near-wall streaks stay more stable on a cooling wall due to weaker momentum exchange. Separation gets stronger on a heating wall. Maximum of turbulent kinetic energy moves closer to the wall with wall heating. Evolvement of coherent structures is accelerated on a heating wall.


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    Title :

    Wall temperature effects on shock wave/turbulent boundary layer interaction via direct numerical simulation


    Contributors:
    Zhu, Ke (author) / Jiang, Lu-Xin (author) / Liu, Wei-Dong (author) / Sun, Ming-Bo (author) / Wang, Qian-Cheng (author) / Hu, Zhi-Wei (author)

    Published in:

    Acta Astronautica ; 178 ; 499-510


    Publication date :

    2020-08-19


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English