View source for Boundary layer separation



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== boundary layer separation ==
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<div class="definition"><div class="short_definition">A condition that occurs at sufficiently high [[Reynolds numbers]] in  which the surface [[streamlines]] break away from the surface.</div><br/> <div class="paragraph">Separation is due to the presence of a solid boundary, at which the no-slip condition&mdash;that is,  the [[velocity]] of the fluid [[particles]] in contact with the surface is the velocity of that surface&mdash;is  satisfied and [[vorticity]] is generated. Separation of a steady [[boundary layer]] at a plane or rounded  rigid wall occurs whenever the velocity of the fluid just outside of the boundary layer decreases in  the mean flow direction sufficiently rapidly and by a sufficient amount. This can be accomplished  by the imposition of an opposing [[pressure gradient]] in the direction of flow.</div><br/> </div><div class="reference">Batchelor, G. K. 1967. Fluid Dynamics. Cambridge University Press, . p. 325. </div><br/> 
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