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Yeah, you guys are describing the same thing from different points of view. The diffuser helps the underbody air smoothly decelerate into the wake. Another way of looking at it is it lets the low pressure from the wake behind the car better reach under the car and help evacuate the air down there, which makes the underbody air flow faster. Faster is lower pressure.I think also there is a coanda effect of the underbody air getting pulled up as the diffuser volume increases going back. That change in the direction of the air also adds downforce. You can see that as a spike in low pressure right where the diffuser starts and the air turns upward.
Yeah, you guys are describing the same thing from different points of view. The diffuser helps the underbody air smoothly decelerate into the wake. Another way of looking at it is it lets the low pressure from the wake behind the car better reach under the car and help evacuate the air down there, which makes the underbody air flow faster. Faster is lower pressure.
I think also there is a coanda effect of the underbody air getting pulled up as the diffuser volume increases going back. That change in the direction of the air also adds downforce. You can see that as a spike in low pressure right where the diffuser starts and the air turns upward.
