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What is the range of y^+ in the viscous sub-layer?

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What is the range of y^+ in the viscous sub-layer?

(a) 0<y^+<20

(b) 0<y^+<5

(c) 0<y^+<10

(d) 0<y^+<15

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This key question is from Turbulent Boundary Layer topic in portion Turbulence Modelling of Computational Fluid Dynamics

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The correct choice is (b) 0<y^+<5

Explanation: This is the layer which is in immediate contact with the smooth wall. It obeys Newton’s law of viscosity. The shear stress in this layer is constant and approximately equal to that of the wall. It extends from the wall till y^+ reaches 5.

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