Quote:
Originally Posted by freebeard
Agreed that localized application is sufficient. That model he's holding in the thumbnail -- they must have had an intern dimple the roof. Compare the hood and rear deck.
Can VG dimples form a vortex street?
Interspacing might be a factor.
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The Karman vortex-street is associated with 2D flow past a cylindrical section, in an 'infinite' un-bounded flow field, with two degrees of freedom.
Since a VG is attached at a 'wall', it's constrained, as far as it's access to the flow field, operating in 'finite', 3D, bounded flow, with no degree of freedom.
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And since VGs can be 'nubs', 'sub-boundary layer thickness', 'boundary layer thickness', super-boundary layer thickness', 'co-rotating', 'counter-rotating', 'large eddy breakup devices', etc., we'd have to be specific.