Figure 10.

(Colour online) Wall-parallel premultiplied streamwise (a–c), wall-normal (or boundary-normal) (d–f) and spanwise (g–i) velocity spectra for R2000 (——) and NS2000 (– – –). The wall-normal (or boundary-normal) locations are $x_2^{+}=0$ (a,d,g), $x_2^{+}=1001$ (b,e,h) and $x_2^{+}=2003$ (c,f,i). Contours are 0.1 and 0.6 of the maximum. The red dotted lines in (d) are λ₁/h = 1 and λ₃/h = 1.