Analysis of Numerical Simulation Database for Pressure Fluctuations Induced by High-Speed Turbulent Boundary Layers

Direct numerical simulations (DNS) of Mach 6 turbulent boundary layer with nominal freestream Mach number of 6 and Reynolds number of Re � 460 are conducted at two wall temperatures (Tw=Tr = 0 :25 , 0 :76 ) to investigate the generated pressure uctuations and their dependence on wall temperature. It is shown that the mean ow predictions and computed frequency spectrum of wall-pressure uctuations are in good agreement with the measurements in the Boeing/AFOSR Mach 6 Quiet Tunnel at Purdue University. Simulations indicate that the inuence of wall temperature on pressure uctuations is largely limited to the near-wall region, with the characteristics of wall-pressure uctuations showing a strong temperature dependence. Wall temperature has little inuence on the propagation speed of the freestream pressure signal. The freestream radiation intensity compares well between wall-temperature cases when normalized by the local wall shear; the propagation speed of the freestream pressure signal and the orientation of the radiation wave front show little dependence on the wall temperature.

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