MCQOPTIONS
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MCQOPTIONS
This section includes 9 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 conditions should be satisfied for a model to be realizable? |
| A. | Bessel’s inequality |
| B. | Cauchy-Schwarz inequality |
| C. | Holder’s inequality |
| D. | Jensen’s inequality |
| Answer» C. Holder’s inequality | |
| 2. |
Though the applicability of the realizable k-ε model and the RNG k-ε model are almost the same, the realizable k-ε model is ___________ when compared to the RNG k-ε model. |
| A. | more accurate and converges easily |
| B. | more stable |
| C. | linear |
| D. | more consistent |
| Answer» B. more stable | |
| 3. |
The realizable k-ε model is best for predicting __________ |
| A. | mixing layers |
| B. | wake formation |
| C. | spreading of jets |
| D. | smooth boundary layer flows |
| Answer» D. smooth boundary layer flows | |
| 4. |
Which of these conditions satisfy realizability? |
| A. | \(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)<1 |
| B. | \(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)>1 |
| C. | \(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)>0 |
| D. | \(-\rho \overline{u_{i}^{‘} u_{j}^{‘}}\)<0 |
| Answer» E. | |
| 5. |
Which of these equations gives the turbulent dynamic viscosity used in the realizable k-ε model? |
| A. | μt ∝ ρk/ε |
| B. | μt ∝ k / ε |
| C. | μt ∝ ρk2/ε |
| D. | μt ∝ k2ε |
| Answer» D. μt ∝ k2ε | |
| 6. |
The non-linear k-ε models relate the Reynolds stresses to _________ |
| A. | the cubic vector products of strain rate and vorticity |
| B. | the quadratic vector products of strain rate and vorticity |
| C. | the cubic tensor products of strain rate and vorticity |
| D. | the quadratic tensor products of strain rate and vorticity |
| Answer» E. | |
| 7. |
The realizable k-ε model is based on ________ |
| A. | the turbulence model replacing the realizability constraint |
| B. | the viscoelastic analogy replacing the realizability constraint |
| C. | the realizability constraint with viscoelastic analogy |
| D. | the realizability constraint without viscoelastic analogy |
| Answer» E. | |
| 8. |
The realizable k-ε model falls into which of these categories? |
| A. | Non-linear two-equation turbulence models |
| B. | Linear two-equation turbulence models |
| C. | Non-linear three-equation turbulence models |
| D. | Linear two-equation turbulence models |
| Answer» B. Linear two-equation turbulence models | |
| 9. |
Which of these conditions define realizability? |
| A. | Negative k and ε values |
| B. | Linear k and ε transport equations |
| C. | Non-negative k and ε values |
| D. | Non-linear k and ε transport equations |
| Answer» D. Non-linear k and ε transport equations | |