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Classical Physics
Mechanics
Would there be turbulence around objects w/o boundary layers
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[QUOTE="boneh3ad, post: 6050761, member: 268837"] This is not correct. In general, the flow around/over an object or surface can be modeled using inviscid flow over most of the domain. The exception is the region very close to the surface where viscosity is important. This entire region where viscosity is important is the boundary layer. Intuitively, it is the region of the flow where the velocity is zero (relative to the surface) where it touches the surface, and is the same as the free-stream velocity at the upper extreme. This requires no knowledge a priori about the laminar/turbulent state of the boundary layer. Before we go any further, I would caution anyone reading this into taking the Wikipedia article at face value. The onset of turbulence, in general, cannot actually be predicted. We know that a higher Reynolds number (##Re##) means we are more likely to see turbulence, but in most cases, there is no foolproof predictive metric. As far as I know, there is no reason to believe that there is some magical surface that would "repel air molecules" in a way that there would be no boundary layer. Even if this was possible, there are fundamentally two things that are required for turbulence: an energy source and viscosity. You haven't eliminated those, so turbulence is still theoretically possible. One possible manifestation of this would be in the wake of the object. [/QUOTE]
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Would there be turbulence around objects w/o boundary layers
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