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Computational Fluid Dynamics
Tricky Computational Fluid Dynamics
Quiz 1
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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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