wesley123 wrote:Scarbs wrote:Diffusers are less sensitive to running in wake, they create downforce centred between the axles and if set at a low expansion ratio are not contributing to wake.
Also the bigger gap between reduces rear wing influence. All the second deck does is creating lower pressure and more diffuser flow so the car generates more downforce, it doesnt increase wake.
The expansion ratio is governed by the height of the diffusor. The DDD height increased by a factor of two or three against the original dimensions. So obviously also the upwash increased significantly. It is not only the turbulence that matters but also the initial direction of the air flow. It is pretty easy to watch the air flow behind cars when they run in the wet and the spray makes the wake visible. It does not look very different to the wake picture we saw last year. There may be some subtle differences but it is obvious, that the main objective of the OWG was missed.
Since we both apparently do not have different CFD models to prove the point a further debate may be useless.