@ImanHansra
The top half of the new, forward element is perhaps the most interesting area of the revised bargeboard set-up – from the above view, the part appears to have some camber, the result of which will be a pressure differential being set up and a vortex being produced.
Given that the height of this vortex will be lower than the top of the main bargeboard, it is possible that this high-energy flow is being used to energise the inboard boundary layer of the main bargeboard, lowering the tendency for it to separate and lead to a rise in pressure drag/loss in bargeboard efficiency.
This could have been achieved by creating a greater number of slots in the main bargeboard, but this would have weakened the vortices shed by it, lowering its effectiveness in directing around around the sidepods, as well as diverting the front tyre wake away from the rear of the car.
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