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The surface structure consisting of riblets measuring around 50 micrometers imitates the properties of sharkskin and therefore optimizes the aerodynamics on flow-related parts of the aircraft.
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There's form drag and skin friction. Aircraft strive for laminar flow but don't reach 100% (witness swing fences, etc).
Cars are immersed in time-varying microclimate turbulence and crosswinds that can exceed their velocity.
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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