I'm trying to see if I can find any literature on this specific question, but a few days of scholarly digging has been fruitless.

Given a 5" round pipe with a bluff body inserted, is there an upper bound for the Reynolds number at which the von Karman Vortex Street is no longer discernible? It seems to me that the vortices would be shed so close to the bluff body that they would be covered up by eddies in a turbulent flow (Say, Re >=100,000).