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 value of y+ at the intersection between the linear profile and log-law is ___________ |
| A. | 20 |
| B. | 5 |
| C. | 30 |
| D. | 11.63 |
| Answer» E. | |
| 2. |
The value of y+ is 50. Which layer does it belong to? |
| A. | Inertia dominated layer |
| B. | Velocity defect layer |
| C. | Log-law layer |
| D. | Law of the wake layer |
| Answer» D. Law of the wake layer | |
| 3. |
What is the range of y+ in the buffer layer? |
| A. | 0 < y<sup>+</sup> < 5 |
| B. | 5 < y<sup>+</sup> < 30 |
| C. | 30 < y<sup>+</sup> < 500 |
| D. | 10 < y<sup>+</sup> < 20 |
| Answer» C. 30 < y<sup>+</sup> < 500 | |
| 4. |
Wall function cannot be used when ___________ |
| A. | y<sup>+</sup><30 |
| B. | y<sup>+</sup>>30 |
| C. | y<sup>+</sup><20 |
| D. | y<sup>+</sup>>20 |
| Answer» B. y<sup>+</sup>>30 | |
| 5. |
What is the unit of y+? |
| A. | y<sup>+</sup> is dimensionless |
| B. | m |
| C. | m<sup>2</sup> |
| D. | 1 m |
| Answer» B. m | |
| 6. |
What is shear velocity? |
| A. | Square of the ratio of density to wall shear stress |
| B. | Square root of the ratio of density to wall shear stress |
| C. | Square of the ratio of wall shear stress to density |
| D. | Square root of the ratio of wall shear stress to density |
| Answer» E. | |
| 7. |
Let y be the distance from the wall, ut be the shear velocity and be the kinematic viscosity. Which of these equations define y+? |
| A. | y<sup>+</sup>=y/u<sub>t</sub> |
| B. | y<sup>+</sup>=u<sub>t</sub> /y |
| C. | y<sup>+</sup>=(y u<sub>t</sub>)/ |
| D. | y<sup>+</sup>=u<sub>t</sub>/y |
| Answer» D. y<sup>+</sup>=u<sub>t</sub>/y | |
| 8. |
The concept of y+ is not used in which of these laws? |
| A. | Law of the wall |
| B. | Law of the wake |
| C. | Log law |
| D. | Linear law |
| Answer» C. Log law | |
| 9. |
The value of y+ is used while finding ___________ |
| A. | eddy kinematic viscosity for the turbulent boundary layers |
| B. | mixing length for the turbulent boundary layers |
| C. | eddy dynamic viscosity for the turbulent boundary layers |
| D. | kinetic energy for the turbulent boundary layers |
| Answer» C. eddy dynamic viscosity for the turbulent boundary layers | |
| 10. |
The value y+ is important only when we deal with ___________ |
| A. | turbulent boundary layers |
| B. | turbulent jets |
| C. | free turbulent mixing layers |
| D. | turbulent wakes |
| Answer» B. turbulent jets | |