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 numberThis question was addressed to me during an online interview.My question comes from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics

Which of these values vanish near the wall boundary?(a) Velocity and t

1.	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 numberThis question was addressed to me during an online interview.My question comes from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics
Answer» 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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