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Each hemispherical rivet head will generate a vortex street. Immediately behind each rivet the surface will experience a [buffeting] downdraft. IMHO, of course.
The scale being small to the surrounding surface, reattachment happens.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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