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BOUNDARY LAYER THEORY - Anasayfa

HIGH RENOLDS NUMBER FLOW BOUNDARY LAYERS(Re ) BOUNDARY LAYERThin region adjacent to surface of a body where viscous forces dominate over inertia forcesRe =Re>> 1 inertiaforcesviscousforces BoundarylayerseparationWake: viscouseffectsnot importantvorticitynot zeroFlowfieldaroundan arbitraryshapeInnerflowStrongviscouseffe ctsOuterflowViscouseffectsnegligibleVort icityzero(Inviscidpotentialflow) BOUNDARY LAYER THEORYS teady ,incompressible 2-D flow with no body forces. Valid for laminar flow for To solve eq.

Boundary Layer Thickness : δ at 5 0.99 (Table) 5 5 Re Re x x U u yy xU UUx x x ηη δ ν δδ νν ∞ ∞∞ ==⇒=→= ≅≅= δ:defined as the distance from the wall for which u=0.99U∞ Boundary Layer Parameter (thicknesses) Most widely used is δ but is rather arbitrary y=δ when u=0.99 U∞

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