MCQOPTIONS
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MCQOPTIONS
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. |
Which of these is an advantage of the k-ω model over the k-ε model? |
| A. | Does not depend on the ε value |
| B. | Easier to integrate |
| C. | Can be applied for turbulent boundary layers |
| D. | Has only two extra equations |
| Answer» C. Can be applied for turbulent boundary layers | |
| 2. |
Using k-ω model is difficult for ____________ |
| A. | free stream |
| B. | boundary layer flows |
| C. | jet flows |
| D. | mixing layer flows |
| Answer» B. boundary layer flows | |
| 3. |
The values of k and ω must be specified in ___________ |
| A. | the inlet boundary conditions |
| B. | the outlet boundary conditions |
| C. | the wall boundary conditions |
| D. | the symmetry boundary conditions |
| Answer» B. the outlet boundary conditions | |
| 4. |
Represent the turbulent dynamic viscosity in terms of k and ω. |
| A. | ρ ω/k |
| B. | ρ k/ω |
| C. | ρ k2/ω |
| D. | ρ ω/k2 |
| Answer» C. ρ k2/ω | |
| 5. |
Represent the length scale in terms of k and ω. |
| A. | ω/k |
| B. | k/ω |
| C. | √k/ω |
| D. | ω/√k |
| Answer» D. ω/√k | |
| 6. |
What is the unit of turbulence frequency? |
| A. | Turbulence frequency is dimensionless |
| B. | 1/s2 |
| C. | s |
| D. | 1/s |
| Answer» E. | |
| 7. |
If k is the turbulent kinetic energy, what is the relationship between the turbulence frequency (ω) and dissipation rate of the turbulent kinetic energy (ε)? |
| A. | ω=ε/k |
| B. | ω=k/ε |
| C. | ω=ε2/k |
| D. | ω=k2/ε |
| Answer» B. ω=k/ε | |
| 8. |
Which of these could not be modelled using the k-ε model, but can be modelled using the k-ω model? |
| A. | Turbulent jet flows |
| B. | Adverse pressure gradients in turbulent flows |
| C. | Boundary layer on turbulent flows |
| D. | Turbulent free flows |
| Answer» C. Boundary layer on turbulent flows | |
| 9. |
What does the variable ω in the k-ω model stand for? |
| A. | Turbulence eddy size |
| B. | Turbulence eddy wavelength |
| C. | Turbulence frequency |
| D. | Turbulence large length scale |
| Answer» D. Turbulence large length scale | |
| 10. |
The k-ω model adds ___________ to the RANS equations. |
| A. | three variables |
| B. | three equations |
| C. | two variables |
| D. | two equations |
| Answer» E. | |