Velocity profiles over the body surface of the sailfish.

<p>Profiles of the mean streamwise velocity (left) and rms streamwise velocity fluctuations (right) at the anterior <b>A</b>, middle and posterior <b>B</b> parts of the sailfish: ○, <i>X/TL</i> = 0.164 (37 cm; <i>Re_X</i> = 4.93×10⁵); △, 0.200 (45 cm; <i>Re_X</i> = 6.00×10⁵); □, 0.240 (54 cm; <i>Re_X</i> = 7.20×10⁵); •, 0.373 (84 cm; <i>Re_X</i> = 1.12×10⁶); ⋄, 0.507 (114 cm; <i>Re_X</i> = 1.52×10⁶); ▪, 0.640 (144 cm; <i>Re_X</i> = 1.92×10⁶); ▽, 0.773 (174 cm; <i>Re_X</i> = 2.32×10⁶). –, turbulent boundary layer profile (1/7^th power law) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0081323#pone.0081323-White1" target="_blank">[45]</a>. Here, <i>X</i> is the streamwise distance from the tip of bill, <i>Y</i> is the wall-normal distance from the body surface and <i>θ</i> is the momentum thickness (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0081323#pone-0081323-t002" target="_blank">Table 2</a>). The velocities are measured along the centerline of side surface of the sailfish at <i>Re_TL</i> = 3.0×10⁶. Shown at the top are the measurement locations in the streamwise direction.