External flow in the nasal region.

<p>Pressure distributions at a swimming speed of 1.55 m/s are shown at spanwise locations near the (A) incurrent and (B) excurrent nostrils. Surface-limited streamlines and velocity contours are shown near the excurrent nostril in (C). a: anterior; d: dorsal; l: lateral; m: medial; p: posterior; v: ventral.