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I think you probably need to simulate the wheel wells to get an accurate estimate of aerodynamics.
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yes but how?
this simulation is 2d, so it's really a slice taken just below the cars under surface... normally it would be just a slice of wheel, but the add-on dams also intersect this plane and they appear as lines... nothing else sticks out into this slice of air, so there's nothing else drawn. i do want to divert air around the open wheelwell above the plane, as this is what oem airdams on some other cars seem to do.
so i want the majority of this flow to go around the area below the wheelwell, even when this is not moddeled.
i know interacting airflow can create flow patters wich are vastly differnent than what happenes with individual components, but i think it can be interesting to isolate certain things, like the dam/wheel, interaction and than try to guess what happenes when this would be integrated in whats aleady there.
that bike fork is interesting!... i think most objects in the end function as crude vortex generators so i think most drag reduction solutions are a matter of countering the bad vortices and enhanceing the good ones