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Ω = Missing Image:img src="SP7_v_files/del.gif" alt="del operator" align="middle" X V
measure of local rotation in a
fluid flow, defined mathematically as the curl of the velocity vector,
Ω is the vorticity; V is the velocity; and Missing Image:img src="SP7_v_files/del.gif" alt="del operator" is the del-operator.
The vorticity component normal to a small plane element is the lime of
the circulation per unit area as the area of the element approaches zero. The
vorticity of a solid rotation is twice the angular velocity vector. In
meteorology, the vorticity usually refers to the vertical component of the
vorticity as defined above.
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use