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Which of these values vanish near the wall boundary?

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in Computational Fluid Dynamics by (118k points)
Which of these values vanish near the wall boundary?

(a) Velocity and turbulent viscosity

(b) Velocity and Reynolds number

(c) Velocity and k-value

(d) k-value and Reynolds number

This question was addressed to me during an online interview.

My question comes from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics

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Correct answer is (c) Velocity and k-value

Explanation: Near the wall boundary, the velocity of the flow is reduced by the friction of the wall. So, velocity vanishes. The variable k stands for turbulent kinetic energy. As the kinetic energy depends on the velocity, when velocity vanishes, k also will vanish.

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