Experimental study on spectrum and multi-scale nature of wall pressure and velocity in turbulent boundary layer*
Zheng Xiao-Boa), Jiang Nana),b),c)
       
(a) Spectrum curves of u ′ at different values of y + with exponential scaling laws; (b) distribution of Fu ( f , y +)d f in plane ( f , y +); (c) distribution of f 2 Fu ( f , y +)d f in plane( f , y +).