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I am not quite sure I am following "angle of the flow to lengthwise of the trim," could you please reiterate?
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[speculation] - A ridge parallel to flow would have negligible effect.
- A ridge athwart the flow would act like a Gurney flap; given enough height, promoting reattachment.
- A ridge at a 45° angle could trigger a vortex on the lee side.
[/speculation]
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