Drag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Number

Figure 3

DR as a function of . (–) Profiles according to (14). (– –) Profiles according to (15). Black colour indicates data for oscillations with and : () DNS from [26], () for channel flow from [27], and (+) for boundary layer experiments from [28]. Red colour indicates data for oscillations with and : () DNS for channel flow from [12]. Green, blue, and cyan colours indicate data for oscillations with and : () DNS for channel flow from [7], (□) DNS for channel flow from [9], and () for channel flow from [27]. Magenta colour indicates data (▽) from the present simulation of a spatially developing boundary layer over oscillations with and .