(Especially of fluid motion) not rotational; having no rotation.
- 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.
- In addition, the postulated role of vorticity production near the head is at variance with inviscid, irrotational models.
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