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For simulation purposes the air moves around the car (as opposed to car moving thorugh air). If we want, we can model the ground to be moving as well, but that is not needed for accuracy.
Meshing
Setup/Solution
The final carbon fibre layup is complex and there are numerous ways to do it (infusion layup, wet layup, etc.). This step will always require the use of vacuum bagging. A process where a plastic bag is wrapped around a the mould and all the air is sucked out; thus applying pressure to the carbon fibre and transferring all the detail of the mould to the final part.
There is an excellent video series on youtube that shows the entire process of making a fibreglass mould, followed by layups inside that mould: