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. |
The term representing the effect of small-scale eddies in diffusion terms of the k transport equation and ε transport equations take the values ___________ and ____________ |
| A. | 1.49, 1.49 |
| B. | 1.39, 1.39 |
| C. | 1.39, 1.49 |
| D. | 1.49, 1.39 |
| Answer» C. 1.39, 1.49 | |
| 2. |
The Reynolds stress term used in the RNG k-ε model is given by 2μt Sij-2⁄3 ρkδij. What does the term δij represent? |
| A. | Kronecker delta |
| B. | Euler delta |
| C. | Hermann delta |
| D. | Cartesian delta |
| Answer» B. Euler delta | |
| 3. |
div[αk μeff grad k] is the diffusion term in the transport equation of the turbulent kinetic energy. αk represents ____________ |
| A. | effects of internal thermal energy |
| B. | effects of turbulent kinetic energy |
| C. | effects of large-scale turbulence |
| D. | effects of small-scale turbulence |
| Answer» E. | |
| 4. |
What is the value of Cμ in the RNG k-ε model? |
| A. | 0.0545 |
| B. | 0.0645 |
| C. | 0.0845 |
| D. | 0.0745 |
| Answer» D. 0.0745 | |
| 5. |
The dynamic eddy viscosity used in the RNG k-ε model is ____________ |
| A. | half of the that of the k-ε model |
| B. | the same as that of the k-ε model |
| C. | twice that of the k-ε model |
| D. | thrice that of the k-ε model |
| Answer» C. twice that of the k-ε model | |
| 6. |
The effective dynamic eddy viscosity is ___________ |
| A. | the addition of molecular dynamic viscosity and dynamic eddy viscosity |
| B. | the ratio of molecular dynamic viscosity and dynamic eddy viscosity |
| C. | the product of molecular dynamic viscosity and dynamic eddy viscosity |
| D. | molecular dynamic viscosity to the power of dynamic eddy viscosity |
| Answer» B. the ratio of molecular dynamic viscosity and dynamic eddy viscosity | |
| 7. |
The effects of the small-scale turbulence are ____________ |
| A. | normalized |
| B. | assumed |
| C. | neglected |
| D. | represented by random forcing functions |
| Answer» E. | |
| 8. |
The RNG k-ε model makes assumptions for ___________ |
| A. | dynamic eddy viscosity |
| B. | kinematic eddy viscosity |
| C. | small-scale turbulence |
| D. | large-scale turbulence |
| Answer» D. large-scale turbulence | |
| 9. |
What does the abbreviation RNG in the RNG k-ε model stand for? |
| A. | Random number generator |
| B. | Renormalization group |
| C. | Renormalization generator |
| D. | Random number group |
| Answer» C. Renormalization generator | |
| 10. |
The RNG k-ε model comes under which of these types of the turbulence models? |
| A. | Two-equation model |
| B. | One-equation model |
| C. | Algebraic model |
| D. | Second-order closure models |
| Answer» B. One-equation model | |