Let y be the distance from the wall, ut be the shear velocity and ν be the kinematic viscosity. Which of these equations define y^+?(a) y^+=y/utν(b) y^+=utν/y(c) y^+=(y ut)/ν(d) y^+=ut/yνI have been asked this question during an internship interview.This intriguing question comes from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics

Let y be the distance from the wall, ut be the shear velocity and ν b

1.	Let y be the distance from the wall, ut be the shear velocity and ν be the kinematic viscosity. Which of these equations define y^+?(a) y^+=y/utν(b) y^+=utν/y(c) y^+=(y ut)/ν(d) y^+=ut/yνI have been asked this question during an internship interview.This intriguing question comes from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics
Answer» Correct answer is (C) y^+=(y ut)/ν The explanation: y^+ is the ratio of the product of the distance from the WALL boundary and the SHEAR VELOCITY to the kinematic VISCOSITY. This is given by the equation y^+=y ut/ν. This is why the value of y^+ increases with the distance from the wall.

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