Recently there were questions/comments on the TWIN PEAKS (islands) of CVFs - here are some more answers:
The reasons HMS Queen Elizabeth has two islands 14 Aug 2017
...The twin island design has several other benefits. Wind tunnel testing has proved that the air turbulence over the flight deck caused by the wind and the ship’s movement, is reduced by having two islands instead of one large one. Turbulent air is a hindrance to flight operations and aircraft carrier designers always have to contend with this problem...."
The reasons HMS Queen Elizabeth has two islands | Save the Royal Navy