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jdawg
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Homework Statement
A reasonable approximation for the two-dimensional incompressible laminar boundary layer on the flat surface in Fig. P4.17 is
u ≈ U(2*(y/δ) - 6*(y3/δ4) + y4/δ4)
δ = Cx1/2 where C is a constant
y ≤ δ
Homework Equations
The Attempt at a Solution
Incompressible so density is constant, 2D flow so no z component, continuity equation reduces to
∂u/∂x + ∂v/∂y = 0For the x component, I got [ (-2y/δ2) + (6*y3/δ4) - (4*y4/δ5) ]
But there is supposed to be a dδ/dx term attached to each term. Where does this term come from? Is it some kind of chain rule thing? Thanks!