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What is shear velocity?

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What is shear velocity?

(a) Square of the ratio of density to wall shear stress

(b) Square root of the ratio of density to wall shear stress

(c) Square of the ratio of wall shear stress to density

(d) Square root of the ratio of wall shear stress to density

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The query is from Turbulence Modelling in division Turbulence Modelling of Computational Fluid Dynamics

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Right option is (d) Square root of the ratio of wall shear stress to density

The explanation: Shear velocity is used while defining the y^+. It otherwise called the friction velocity. It is the square root of the ratio of wall shear stress to density. It has the same unit as that of normal velocity.

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