Harley-Davidson makes a motorcycle called the V-Rod. In the R&D phase, they had a hard time getting enough air to go thru the radiator as it was their 1st production liquid cooled model. They just refused to put an oversized radiator on the bike. Their solution was to install vortex generators on the inside of the opening of the shroud that went around the radiator to direct more air thru it, making the radiator more efficient.
