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The skin drag of the strakes adds energy to the wake away from the main surface, and prevents large-scale turbulence. The Bertone BATs used somewhat the same principle, as well as creating what a HVAC guy would call a split diffuser.
To study tuft behaviour, you could put a small streamlined shape on your hood, with a tuft on top for crosswind-induced angle of attack indication, and one on the side to indicate separation.
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