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What is u^+?

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What is u^+?

(a) The ratio of velocity parallel to the wall to the friction velocity

(b) The ratio of the friction velocity to velocity parallel to the wall

(c) The ratio of free-stream velocity and friction velocity

(d) The ratio of friction velocity and free-stream velocity

The question was asked in an online quiz.

My question is based upon Turbulent Boundary Layer topic in division Turbulence Modelling of Computational Fluid Dynamics

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The correct choice is (a) The ratio of velocity parallel to the wall to the friction velocity

Explanation: u^+ is the dimensionless velocity. It is defined as the ratio of the velocity of fluid particle parallel to the wall at a particular distance from the wall to the friction velocity. Friction velocity is the square root of the ratio of shear stress to the density of fluid.

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