Abstract Shockwave/turbulent boundary layer interaction on flat plate are investigated by using direct numerical simulation at different wall temperature of 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.
Wall temperature effects on shock wave/turbulent boundary layer interaction via direct numerical simulation
Acta Astronautica ; 178 ; 499-510
2020-08-19
12 pages
Article (Journal)
Electronic Resource
English
Shockwave/turbulent boundary layer interaction , Wall temperature effects , Direct numerical simulation , Near-wall streaks , Counter-rotating vortex , RMS , root mean square , SBLI , shock wave/turbulent boundary layer interaction , TBL , turbulent boundary layer , DNS , direct numerical simulation , N–S , Navier-Stokes
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