Explore topic-wise MCQs in Computational Fluid Dynamics.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Computational Fluid Dynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

If κ is the wavenumber and ε is the rate of dissipation of turbulent energy, which of these is proportional to the spectral energy of the inertial sub-range of turbulence?

A. κ-5/3ε-2/3
B. κ5/3ε-2/3
C. κ5/3ε2/3
D. κ-5/3ε2/3
Answer» E.
Discussion
2.

_____________ are called the inertial sub-range of turbulence.

A. Kolmogorov micro-scale
B. Small scale eddies
C. Intermediate scale eddies
D. Large scale eddies
Answer» D. Large scale eddies
Discussion
3.

____________ is associated with high wavenumbers.

A. Conduction
B. Dissipation
C. Kinetic energy
D. Potential energy
Answer» C. Kinetic energy
Discussion
4.

The size of the eddies and the wavenumber are __________

A. inversely proportional
B. directly proportional
C. not related to each other
D. related but it varies according to the energy
Answer» B. directly proportional
Discussion
5.

If ν is the kinematic viscosity and ε is the rate of dissipation of turbulent energy, to which of these terms is the spectral energy of Kolmogorov micro-scale eddies proportional to?

A. ν5/3 ε1/3
B. ν3/2 ε1/2
C. ν1/2 ε3/2
D. ν5/4 ε1/4
Answer» E.
Discussion
6.

What is the range of length and frequency of the Kolmogorov micro-scale eddies respectively?

A. 0.1 to 1 mm, around 1 kHz
B. 1-10 mm, around 10 kHz
C. 0.01 to 0.1 mm, around 10 kHz
D. around 10 mm, 0.1 to 0.01 kHz
Answer» D. around 10 mm, 0.1 to 0.01 kHz
Discussion
7.

What is the unit of spectral energy?

A. \(\frac{m}{s^2}\)
B. \(\frac{m^3}{s^2}\)
C. \(\frac{m^2}{s^3}\)
D. \(\frac{m^2}{s^2}\)
Answer» C. \(\frac{m^2}{s^3}\)
Discussion
8.

Spectral energy is equal to ___________

A. Kinetic energy per unit mass per unit wavenumber
B. Rate of dissipation of turbulent energy per unit mass per unit wavenumber
C. Rate of dissipation of turbulent energy per unit wavenumber
D. Kinetic energy per unit wavenumber
Answer» B. Rate of dissipation of turbulent energy per unit mass per unit wavenumber
Discussion
9.

Kolmogorov spectral energy is a function of ____________

A. Velocity
B. Wavenumber
C. Kinematic viscosity
D. Dynamic viscosity
Answer» C. Kinematic viscosity
Discussion
10.

Kolmogorov micro-scales can be expressed in terms of ___________

A. Rate of dissipation of turbulent energy and fluid viscosity
B. Turbulent energy and fluid velocity
C. Fluid velocity and viscosity
D. Turbulent energy and fluid viscosity
Answer» B. Turbulent energy and fluid velocity
Discussion