Quote:
Originally Posted by Dan0myte
If the wind blows from the south it needs a place to exit, otherwise the roof would act as a giant wind sail.
The stadium would end up looking similar to this guy without it:
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Especially as the roof will be made of a fabric... I suspect another reason for that channel is to prevent wind buffeting - would be very uncomfortable if there was relatively rapid air pressure changes within the stadium with any slight shift in the wind (just like driving on the highway with one window, or sunroof, open - bothers the ears until you crack another window just a bit).
I wouldn't be surprised if the "flare" (as Stormer put it) helps prevent swirling/vortex conditions inside. And since this shape of the structure is essentially circular I don't think the prevailing direction of wind will have as much of an effect on the field or stands as the overall amount of wind - the same way a sailboat tacks with its main sail (the Stadium has no jib). Windspeed along the perimeter of the building will be the same no matter which direction it blows from, any significant air movement inside the stadium will come from whatever blows over the lip of the roof.