Computational Fluid Dynamics Mock Test 6

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Question 1 of 10

1. The average of the mean component will be ____________

equal to 1

equal to zero

equal to the mean component itself

equal to the fluctuating component

Question 1 of 10

Question 2 of 10

2. Kolmogorov micro-scales can be expressed in terms of ___________

Fluid velocity and viscosity

Turbulent energy and fluid viscosity

Rate of dissipation of turbulent energy and fluid viscosity

Turbulent energy and fluid velocity

Question 2 of 10

Question 3 of 10

3. Which of these is the spectral cut-off filter function?

\(\prod_{i=1}^3\frac{sin[(x_i-x_i^{'})/\Delta]}{(x_i-x_i^{'})}\)

\(\prod_{i=1}^3 sin[(x_i-x_i^{'})/\Delta]\)

\(\prod_{i=1}^3 sin[(x_i-x_i^{'})/\Delta] \)

\(\prod_{i=1}^3\frac{sin[(x_i-x_i^{'})]}{(x_i-x_i^{'})}\)

Question 3 of 10

Question 4 of 10

4. The mean of the product of the mean component of one variable and the fluctuating component of another variable is ____________

the product of their fluctuating components

the product of their mean components

Question 4 of 10

Question 5 of 10

5. The velocity at a point far away from the wall is defined by ____________

Velocity-defect law

Log-law

Power law

Newton’s law of viscosity

Question 5 of 10

Question 6 of 10

6. When the Reynolds number increases, the difference between the large and small scales ____________

cannot be defined

decreases

remains constant

increases

Question 6 of 10

Question 7 of 10

7. Consider a vector flow variable which can be decomposed as \(\vec{a}=\vec{A}+\vec{a'}.\overline{div \,\vec{a}}\) will be equal to ____________

\(\overline{div \vec{a}}\)

\(\overline{div \vec{a'}}\)

\(\overline{div \vec{A}}\)

div \(\vec{A}\)

Question 7 of 10

Question 8 of 10

8. Express the time-scale ratio in terms of Reynolds number (Re).

Re^-1/2

Re^-1/4

Re^3/4

Re^1/2

Question 8 of 10

Question 9 of 10

9. Large eddies are _________

two-dimensional and isotropic

three-dimensional and anisotropic

two-dimensional and isotropic

two-dimensional and anisotropic

Question 9 of 10

Question 10 of 10

10. Which of these laws define the dimensionless quantities u⁺ and y⁺?

Velocity-defect law

Law of the wall

Newton’s law of viscosity

Log-law

Question 10 of 10