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- model and the RNG k- model are almost the same, the realizable k- model is ___________ when compared to the RNG k- model. |
| A. | more accurate and converges easily |
| B. | more stable |
| C. | linear |
| D. | more consistent |
| Answer» B. more stable | |
| 3. |
The realizable k- 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- model? |
| A. | <sub>t</sub> k/ |
| B. | <sub>t</sub> k / |
| C. | <sub>t</sub> k<sup>2</sup>/ |
| D. | <sub>t</sub> k<sup>2</sup> |
| Answer» D. <sub>t</sub> k<sup>2</sup> | |
| 6. |
The non-linear k- 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- 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- 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 values |
| B. | Linear k and transport equations |
| C. | Non-negative k and values |
| D. | Non-linear k and transport equations |
| Answer» D. Non-linear k and transport equations | |