单词	irrotational
释义	irrotational /ˌɪrəʊˈteɪʃ(ə)n(ə)l / adjective Physics (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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