[aerohead]

Out of courtesy I wanted to touch base.
I've read, and re-read your post.
Ferrari did a project like yours in the past, and it ended with 1,000-hours in the wind tunnel, at $1,000 / hour, plus track time in Modena, to evaluate all the the transient dynamics and loadings, with respect to drag and downforce, for all locations along the race course.
If you're a millionaire, then you'd be able to absorb the economic and human capital costs such a sophisticated project like yours would involve to reach a solution.
My dad knew a race driver who operated a speed shop in Southern California. When a prospective client would ask him, 'How fast can you make my car go?', his response was always,' How much money do you have?'
Presently, a full-scale, rolling-road wind tunnel is going to set you back $4,000 /hour.
I don't know what you could possibly do without one.
And to hire someone with at least a graduate degree in CFD, and years of experience, I don't know how you could afford to attempt it 'virtually.'
I don't mean to be a buzz-kill, but reality IS going to intrude upon your dreams, and they're EXPENSIVE ones.