Multiple questions for aerospace folks here: Why are designs with multiple wings no longer developed, not just bi/tri wing planes with wings stacked, but why a

Multiple questions for aerospace folks here: Why are designs with multiple wings no longer developed, not just bi/tri wing planes with wings stacked, but why aren’t their rows of smaller wings, or multiple wings? Do the vortices of the trail of a leading wing fuck up themlift potential on wings behind it? —- We simple golf balls for greater distance through the air, and Wales see an advantage to the barnacles that grow on the leading edge of their flippers which have shown to create eddys behind the tail edge of the flipper which aids in greater vortices and greater propulsion.. Why don’t we dimple wing surfaces? Or plane bodies? Or helicopter blades? What happens when we simulate the leading edge barnacle bumps on the leading edge of a wing, or more aptly, the leading edge of a blade on a helicopter? What software is used to model the airflow over a wings surface, such as solid works… — How much overlap is there between fluid hydro and aero dynamics? (Specifically the observation of the impact to flow/eddy creation over a surface?)