“…Webb et al 66 and Caraballo et al 62 also disagree on the mechanism of control itself. Caraballo et al 62 suggested that the excitation of the SBLI unsteadiness was the main mechanism however Webb et al 66 suggested that simply the heating of the boundary layer is the control mechanism. Compelling evidence presented in the study supports the conclusion of Webb et al 66 Firstly, there was no significant "peak-effectiveness" 66 frequency observed within the range f F 1.5.…”