Figure 7. Pressure contour of (A): Sawtooth riblet, (B): Scalloped riblet, (C): Simple flat plate

From

Drag Reduction by Using the Microriblet of Sawtooth and Scalloped Types

Alireza Heidarian, Hassan Ghassemi, Pengfei Liu

International Journal of Physics. 2018, 6(3), 93-98 doi:10.12691/ijp-6-3-5