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Which of these laws define the dimensionless quantities u^+ and y^+?

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in Computational Fluid Dynamics by (118k points)
Which of these laws define the dimensionless quantities u^+ and y^+?

(a) Velocity-defect law

(b) Log-law

(c) Newton’s law of viscosity

(d) Law of the wall

The question was posed to me during an interview for a job.

Question is taken from Turbulent Boundary Layer in section Turbulence Modelling of Computational Fluid Dynamics

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Correct option is (d) Law of the wall

The explanation is: The law of the wall is the relationship between the mean flow velocity and the distance from the wall derived using dimensional analysis. This gives the relationship between two important dimensionless quantities u^+ and y^+.

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