Like this example of the Coanda Effect
effect......
Watch the flow after the spoon......
p.s. Thanks to You Tube etc.....
Cheers
p.p.s....All I know is that when the airspeed gets to be 'this', I pull back a little 'here' and the houses get smaller.....
I don't really care 'how'...I just am thankful that it 'does'.....
;