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About: Okubo–Weiss parameter     Goto   Sponge   NotDistinct   Permalink

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In fluid mechanics, the Okubo–Weiss parameter, (normally given by "W") is a measure of the relative importance of deformation and rotation at a given point. It is calculated as the sum of the squares of normal and shear strain minus the relative vorticity. This is widely applicable in fluid properties particularly in identifying and describing oceanic eddies. For a horizontally non-divergent flow in the ocean, the parameter is given by: where: * is the normal strain. * is the shear strain. * is the relative vorticity.