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She told him about an important difference between the irrotational wave he had just described and a rotational wave.
Didn't Rafe understand that an ideal fluid is incompressible and lacks viscosity, and its flow is steady and irrotational ?
In addition, the postulated role of vorticity production near the head is at variance with inviscid, irrotational models.
The fluid is irrotational at all points, except next to a vortex street wake behind the fish.
In essence, 3D flows can be considered as complex combinations of irrotational and rotational strains that vary in space with time.
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