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Both runways on this carrier have 1/4-round, leading-edge fairings, as you'd see on the bottom of an open-test-section wind tunnel nozzle at the test-section's entrance, which prevents vena-contracta entry loss formation and the attendant turbulence formation.
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There's the answer to OP's question.
Your diverters and air dams on cars must use
vena contracta to limit the air going into the underbody.