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 turbulent kinetic energy production is limited to prevent the build-up of turbulence in __________ regions. |
| A. | far-field |
| B. | near-wall |
| C. | stagnation |
| D. | trailing |
| Answer» D. trailing | |
| 2. |
A limiter is imposed on _________ to improve the performance in adverse pressure gradients and wake regions. |
| A. | the Reynolds number |
| B. | the eddy viscosity |
| C. | the k-value |
| D. | the ε-value |
| Answer» C. the k-value | |
| 3. |
The blending function is __________ at the wall and __________ in the far field. |
| A. | 0,→1 |
| B. | 0,→∞ |
| C. | 1,0 |
| D. | 1,∞ |
| Answer» B. 0,→∞ | |
| 4. |
The blending function used in the Shear Stress Transport model is a function of _____________ |
| A. | Turbulent kinematic viscosity, the ratio of turbulence and distance from the wall |
| B. | Turbulence Reynolds number, turbulent kinematic viscosity and distance from the wall |
| C. | Turbulence Reynolds number, the ratio of turbulence and turbulent kinematic viscosity |
| D. | Turbulence Reynolds number, the ratio of turbulence and distance from the wall |
| Answer» E. | |
| 5. |
Which of these problems may occur because of the hybrid nature of the Shear Stress Transport model? |
| A. | Non-linearity |
| B. | Inconsistency |
| C. | Numerical instability |
| D. | Inaccuracy |
| Answer» D. Inaccuracy | |
| 6. |
The σk value used in the Shear Stress Transport model is ________ |
| A. | -1 |
| B. | 1 |
| C. | 2 |
| D. | -2 |
| Answer» C. 2 | |
| 7. |
When compared to the standard ε-equation, the transformed ω-equation has _________ |
| A. | the same number of terms |
| B. | an extra dissipation term |
| C. | two extra source terms |
| D. | an extra source term |
| Answer» E. | |
| 8. |
Which of these statements holds true regarding the Shear Stress Transport model? |
| A. | In the near-wall region, the k-ε model is transformed into k-ω model |
| B. | In the near-wall region, the standard k-ε model is used |
| C. | In regions far from the wall, the k-ε model is transformed into k-ω model |
| D. | In regions far from the wall, the k-ω model is used |
| Answer» B. In the near-wall region, the standard k-ε model is used | |
| 9. |
Which of these is unmodified for the Shear Stress Transport model and the k-ω model? |
| A. | Reynolds stress calculation and the k-equation |
| B. | Reynolds stress calculation and the ε-equation |
| C. | The k-equation and the ε-equation |
| D. | Reynolds stress calculation, the k-equation and the ε-equation |
| Answer» B. Reynolds stress calculation and the ε-equation | |
| 10. |
The Shear Stress Transport model is a hybrid of _________ |
| A. | the standard k-ε model and the k-ω model |
| B. | the standard k-ε model and the RNG k-ε model |
| C. | the realizable k-ε model and the RNG k-ε model |
| D. | the realizable k-ε model and the k-ω model |
| Answer» B. the standard k-ε model and the RNG k-ε model | |