I'm curious, why is stirring the beer not required when dry hopping, or adding other ingredients like vanilla beans or other solids?
When I added my vanilla into my keg, I dunked it a few times with a sanitized racking cane, but have otherwise left it alone. Obviously, after a few days I have some wonderful vanilla flavors and aromas in it. How does it distribute itself so well? The beans (in a hop bag) float on top, the dip tube is on the bottom.
I understand that it's not needed, I'm not arguing that, I'm just curious to know the science behind how it distributes throughout the whole beer while just floating on top.