Q.1
The value y+ is important only when we deal with ___________
  • a) turbulent boundary layers
  • b) turbulent jets
  • c) free turbulent mixing layers
  • d) turbulent wakes
Q.2
The value of y+ is used while finding ___________
  • a) eddy kinematic viscosity for the turbulent boundary layers
  • b) mixing length for the turbulent boundary layers
  • c) eddy dynamic viscosity for the turbulent boundary layers
  • d) kinetic energy for the turbulent boundary layers
Q.3
The concept of y+ is not used in which of these laws?
  • a) Law of the wall
  • b) Law of the wake
  • c) Log law
  • d) Linear law
Q.4
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/yν
Q.5
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
Q.6
What is the unit of y+?
  • a) y+ is dimensionless
  • b) m
  • c) m2
  • d) 1⁄m
Q.7
Wall function cannot be used when ___________
  • a) y+<30
  • b) y+>30
  • c) y+<20
  • d) y+>20
Q.8
What is the range of y+ in the buffer layer?
  • a) 0 < y+ < 5
  • b) 5 < y+ < 30
  • c) 30 < y+ < 500
  • d) 10 < y+ < 20
Q.9
The value of y+ isWhich layer does it belong to?
  • a) Inertia dominated layer
  • b) Velocity defect layer
  • c) Log-law layer
  • d) Law of the wake layer
Q.10
The value of y+ at the intersection between the linear profile and log-law is ___________
  • a) 20
  • b) 5
  • c) 30
  • d) 11.63
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